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PreMain.java
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PreMain.java
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package com.oxagent;
import javassist.*;
import java.io.*;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.math.BigInteger;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.MessageDigest;
import java.security.ProtectionDomain;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PreMain {
public static void premain(String agentArgs, Instrumentation inst) throws Exception {
if (agentArgs == null) {
print_error("Please give me key to setup, xxx.jar=xxxxx");
return;
}else{
print_good("I got you key,Patching~");
}
// check hash
HashMap<String, String> hashArray = new HashMap<String, String>();
hashArray.put("Cobalt Strike 4.5 (December 14, 2021)", "a5e980aac32d9c7af1d2326008537c66d55d7d9ccf777eb732b2a31f4f7ee523");
hashArray.put("Cobalt Strike 4.4 (August 04, 2021) ", "7af9c759ac78da920395debb443b9007fdf51fa66a48f0fbdaafb30b00a8a858");
hashArray.put("Cobalt Strike 4.3 (March 17, 2021) [bug fixes]", "c3c243e6218f7fbaaefb916943f500722644ec396cf91f31a30c777c2d559465");
hashArray.put("Cobalt Strike 4.3 (March 3, 2021)", "02fa5afe9e58cb633328314b279762a03894df6b54c0129e8a979afcfca83d51");
hashArray.put("Cobalt Strike 4.2 (November 6, 2020)", "56a53682084c46813a5157d73d7917100c9979b67e94b05c1b3244469e7ee07a");
hashArray.put("Cobalt Strike 4.1 (June 25, 2020)", "1f2c29099ba7de0f7f05e0ca0efb58b56ec422b65d1c64e66633fa9d8f469d4f");
hashArray.put("Cobalt Strike 4.0 (February 22, 2020) [bug fixes]", "10fe0fcdb6b89604da379d9d6bca37b8279f372dc235bbaf721adfd83561f2b3");
hashArray.put("Cobalt Strike 4.0 (December 5, 2019)", "558f61bfab60ef5e6bec15c8a6434e94249621f53e7838868cdb3206168a0937");
print_info("Hey! guys,I'll check file sha256 hash,Please wait me about 10s......");
File file = new File("cobaltstrike.jar");
if(!file.exists()){
print_error("Hey guys,Please rename your xxx.jar to cobaltstrike.jar Thanks!");
System.exit(1);
}else{
print_good("Loading cobaltstrike.jar");
}
String FileHash = getHash(file);
boolean isTrueFile = false;
System.out.println(FileHash);
for (String version : hashArray.keySet()) {
if(hashArray.get(version).equals(FileHash)){
print_good("File: " + file + "; Version: " + version + "; SHA256: " + hashArray.get(version));
isTrueFile = true;
}
}
if(!isTrueFile){
print_error("SHA256: " + FileHash + " Fuck off! Get out! Bad cobaltstrike.jar");
System.exit(1);
}
inst.addTransformer(new CobaltStrikeTransformer(agentArgs), true);
}
public static final String scrub(String var0) {
return var0 == null ? null : var0.replace('\u001b', '.');
}
public static final void print_good(String var0) {
System.out.println("\u001b[01;32m[+]\u001b[0m " + scrub(var0));
}
public static final void print_error(String var0) {
System.out.println("\u001b[01;31m[-]\u001b[0m " + scrub(var0));
}
public static final void print_info(String var0) {
System.out.println("\u001b[01;34m[*]\u001b[0m " + scrub(var0));
}
public static final void print_warn(String var0) {
System.out.println("\u001b[01;33m[!]\u001b[0m " + scrub(var0));
}
public static final void print_stat(String var0) {
System.out.println("\u001b[01;35m[*]\u001b[0m " + scrub(var0));
}
static class CobaltStrikeTransformer implements ClassFileTransformer {
private final ClassPool classPool = ClassPool.getDefault();
private final String hexkey;
public CobaltStrikeTransformer(String args) {
this.hexkey = args;
print_info(args);
}
@Override
public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
//return new byte[0];
//System.out.println(className);
try {
if (className == null) {
return classfileBuffer;
} else if (className.equals("sun/management/VMManagementImpl")) {
print_good("Patch exit");
CtClass cls = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));
CtMethod cmsave = cls.getDeclaredMethod("getVmArguments");
cmsave.setBody("{ java.util.List listr;\n" +
" listr = new java.util.ArrayList();\n" +
" listr.add(\"-XX:+AggressiveHeap\");\n" +
" listr.add(\"-XX:+UseParallelGC\");\n" +
" return listr; }");
return cls.toBytecode();
}
else if (className.equals("common/Authorization")) {
// set key
CtClass cls = null;
cls = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));
String func = "public static byte[] hex2bytes(String s) {" +
" int len = s.length();" +
" byte[] data = new byte[len / 2];" +
" for (int i = 0; i < len; i += 2) {" +
" data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i+1), 16));" +
" }" +
" return data;" +
"}";
CtMethod hex2bytes = CtNewMethod.make(func, cls);
cls.addMethod(hex2bytes);
CtConstructor mtd = cls.getDeclaredConstructor(new CtClass[]{});
mtd.setBody("{$0.watermark = 100000;" +
"$0.validto = \"forever\";" +
"$0.valid = true;" +
"$0.watermarkHash = \"BeudtKgqnlm0Ruvf+VYxuw==\";" +
"common.MudgeSanity.systemDetail(\"valid to\", \"perpetual\");" +
"common.MudgeSanity.systemDetail(\"id\", String.valueOf($0.watermark));" +
"common.SleevedResource.Setup(hex2bytes(\"" + hexkey + "\"));" +
"}");
return cls.toBytecode();
} else if (className.equals("sleep/runtime/ScriptLoader")) {
if(!Files.notExists(Paths.get("scripts/default.cna"))){
print_good("Patching default.cna add Payload(s)");
}
print_good("Patching ScriptLoader use UTF-8");
CtClass cls = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));
CtMethod mtd = cls.getDeclaredMethod("getInputStreamReader");
mtd.insertBefore("setCharset(\"UTF-8\");");
return cls.toBytecode();
} else if (className.equals("cloudstrike/WebServer")) {
// Skip scan stager
print_good("[*] Patching Checksum8");
String httpStager86 = "";
String httpStager64 = "";
// Get c2profile config
if (Files.notExists(Paths.get("c3.profile"))) {
System.out.println("[-] Not found c3.profile,skip patch");
return classfileBuffer;
}else {
print_good("Found c3.profile,try to get config");
BufferedReader in = new BufferedReader(new FileReader("c3.profile"));
String str;
while ((str = in.readLine()) != null) {
if(str.contains("uri_x86")){
String pattern = "set uri_x86 \"(.*?)\";";
Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(str);
if (m.find( )) {
print_info("Found uri_x86 value: " + m.group(1) );
httpStager86 = m.group(1);
}
}
if(str.contains("uri_x64")){
String pattern = "set uri_x64 \"(.*?)\";";
Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(str);
if (m.find( )) {
print_info("Found uri_x64 value: " + m.group(1) );
httpStager64 = m.group(1);
}
}
}
}
CtClass cls = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));
CtMethod cmisStager = cls.getDeclaredMethod("isStager");
CtMethod cmisStagerX64 = cls.getDeclaredMethod("isStagerX64");
String checksum8Patch = "public static long checksum8Patch(String text) {\n" +
" if (text.length() < 4) {\n" +
" return 0L;\n" +
" }\n" +
" text = text.replace(\"/\", \"\");\n" +
" long sum = 0L;\n" +
" for (int x = 0; x < text.length(); x++) {\n" +
" sum += text.charAt(x);\n" +
" }\n" +
"\n" +
" return sum;\n" +
" }";
CtMethod checksum8PatchFunc = CtNewMethod.make(checksum8Patch, cls);
cls.addMethod(checksum8PatchFunc);
cmisStager.setBody("{ System.out.println(\"\u001b[01;34m[*]\u001b[0m I got new uri,Maybe is a bad gay \"+$1);" +
"return checksum8Patch($1) == checksum8Patch(\""+httpStager86+"\"); }");
cmisStagerX64.setBody("{ System.out.println(\"\u001b[01;34m[*]\u001b[0m I got new uri,Maybe is a bad gay \"+$1);" +
"return checksum8Patch($1) == checksum8Patch(\""+httpStager64+"\"); }");
print_good("Patch done");
return cls.toBytecode();
} else if (className.equals("aggressor/Prefs")) {
print_good("Patch aggressor save");
CtClass cls = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));
CtMethod cmsave = cls.getDeclaredMethod("save");
cmsave.setBody("{}");
return cls.toBytecode();
}
} catch (Exception e) {
e.printStackTrace();
}
return classfileBuffer;
}
}
public static byte[] hex2bytes(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
}
return data;
}
private static String getHash(File fileName) throws Exception {
byte[] buffer = new byte[8192];
ByteArrayOutputStream bufferArr = new ByteArrayOutputStream();
int count;
MessageDigest digest = MessageDigest.getInstance("SHA-256");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fileName));
while ((count = bis.read(buffer)) > 0) {
bufferArr.write(buffer,0,count);
}
byte[] buffer2 = bufferArr.toByteArray();
digest.update(buffer2, 0, buffer2.length);
bis.close();
byte[] hash = digest.digest();
return toHexString(hash);
}
public static String toHexString(byte[] hash)
{
// Convert byte array into signum representation
BigInteger number = new BigInteger(1, hash);
// Convert message digest into hex value
StringBuilder hexString = new StringBuilder(number.toString(16));
// Pad with leading zeros
while (hexString.length() < 32)
{
hexString.insert(0, '0');
}
return hexString.toString();
}
public static void main(String[] args) throws Exception {
}
}