通用型微信抢红包神器（已修复）

2016-02-26

Author: Evi1m0 (404安全实验室)

Date: 2016-02-26

本篇文章记录 2015年初时利用微信网页版红包 H5 接口实现的通用型平台抢红包神器，不同于目前市面上的抢红包外挂（模拟点击、HookAPI等）方式，当然该漏洞在15年3月便已经修复。

WebAPI

我们在使用网页版微信时无法点击领取红包，但是通过控制台查看网络包发现红包地址在 Response 中：

https://wxapp.tenpay.com/app/v1.0/receive.cgi?showwxpaytitle=1&sendid=1000033901********10153974107&channelid=1&msgtype=1&ver=2&sign=aefc0f0fadb6f09993fb071bf3****************9b4d8020f07c351c4bb6489d60d65f7f9fb2622f977fa613cbe443f6c7279f03fff2aff18859674c978656ed45388e3f606eae42a0f8ef9014f1***********21e055163c935

https://wxapp.tenpay.com/app/v1.0/receive.cgi?showwxpaytitle=1&sendid=1000033901********10153974107&channelid=1&msgtype=1&ver=2&sign=aefc0f0fadb6f09993fb071bf3****************9b4d8020f07c351c4bb6489d60d65f7f9fb2622f977fa613cbe443f6c7279f03fff2aff18859674c978656ed45388e3f606eae42a0f8ef9014f1***********21e055163c935

当群组或者用户给我们发红包时可以在返回内容中可以看到红包的 URL 地址（手机端老版本的微信是使用 H5 的接口领取红包，而无法自动判断用户发来的消息是否为红包，网页版本微信解决了判断是否为红包消息的问题，并且能获取 URL）。

直接在浏览器访问获取到的红包 URL，提示来源错误。任何 HTTP 请求重放都是简单的，之后使用 Mitmproxy 获取手机抢红包时的 Cookie,User-Agent 等 Header 头，然后进行重放包是可以成功领取红包的。

Process

流水线：

使用 JavaScript 对微信网页版 Hook 实时监听，判断收到消息是否为红包，如果是则匹配；
使用 Mitmproxy 对手机端进行抓包，获取 Header 信息；
利用获取到的头信息填充至开始获得到的红包地址，领取红包；

自动化：

编写填充头信息以方便打开红包的 Python 脚本；
编写实时监控浏览器中网络传输红包数据的 JavaScript 脚本；
考虑方便本机搭建 Mini Django 项目，在获取到红包 URL 后自动发送请求给后端抢红包[1]；
...

效果图：

Code

wechat_web_hook.js:

s:

/*
 * HookJS @ evi1m0, fyth, erevus.
 * Datetime @ 2015
 */

$._ajax = $.ajax;

function check(c){
    var AddMsgList = c.AddMsgList;
    if (AddMsgList) {
        AddMsgList.forEach(function(elem, index){
            var str = '';
            str = elem.Url || '';
            var bingo = /https:\/\/wxapp.tenpay.com/.test(str);
            if(bingo) {
                str = str.replace(/amp;/g, '')
                console.log(str);
                $.post('http://localhost:1234/wechat', {url: str})
            }
        });
    }
}

function a(e, n){
    e._s = e.success;
    e.success = function(data) {
        try{
            check(data, this);
            this._s.apply(this, arguments);
        }
        catch(e){

        }
    }
    c = $._ajax(e, n);
    return c;
}
$.ajax = a;

* HookJS @ evi1m0, fyth, erevus.

* Datetime @ 2015

$._ajax = $.ajax;

function check(c){

var AddMsgList = c.AddMsgList;

if (AddMsgList) {

AddMsgList.forEach(function(elem, index){

var str = '';

str = elem.Url || '';

var bingo = /https:\/\/wxapp.tenpay.com/.test(str);

if(bingo) {

str = str.replace(/amp;/g, '')

console.log(str);

$.post('http://localhost:1234/wechat', {url: str})

}

});

}

function a(e, n){

e._s = e.success;

e.success = function(data) {

try{

check(data, this);

this._s.apply(this, arguments);

}

catch(e){

}

c = $._ajax(e, n);

return c;

}

$.ajax = a;

views.py:

#!/usr/bin/env python
# author  : evi1m0, rains
# datetime: 201502

from django.shortcuts import render
from django.http import HttpResponse

import re
import sys
import json
import time
import base64
import urllib
import urllib2
import requests

def index(request):
    url = 'http://www.baidu.com'
    req = urllib2.urlopen(url)
    content = req.read()
    return HttpResponse(content)


def open(request, url):
    url = urllib.unquote(url).replace('amp;', '')
    print url
    cookie = "test NULL"
    return HttpResponse(_money(url, cookie))


def _money(url, cookie):
    headers_fake = {'User-Agent': ("Mozilla/5.0 (Linux; U; Android 4.2.2; zh-cn; Galaxy Nexus - 4.2.2 - with Google Apps"
                                   "- API 17 - 720x1280 1 Build/JDQ39E) AppleWebKit/534.30 (KHTML, like Gecko)"
                                   "Version/4.0 Mobile Safari/534.30 MicroMessenger/5.3.0.80_r701542.440"),
                    'X-Requested-With': 'com.tencent.mm',
                    'Cookie': cookie,
                   }

    try:
        req_key_content = requests.get(url, headers=headers_fake).content
    except Exception,e:
        print e

    try:
        g_sendld = re.findall('g_sendId: "(.*?)",', req_key_content)
        g_sendnick = re.findall('g_sendNick: "(.*?)",', req_key_content)
        g_detailtoke = re.findall('g_detailToke: "(.*?)",', req_key_content)
        g_detailtoke = (g_detailtoke[0])
    except Exception, e:
        print '[-] Error: %s' % str(e)
        return False

    sign_key = (str(url.split('&')[-1:]).split('=')[1])[:-2]
    receive_url = ("https://wxapp.tenpay.com/app/v1.0/wxhb_open.cgi?msg_type=&send_id=%s&channel_id=&detailToke=%s&scene="
                   "&us=&sign=%s&attention=0&hb_version=v2&ver=2&isappinstalled=0&clientversion=25030050&devicetype=android"
                   "-17")
    receive_url = receive_url % (g_sendld[0], g_detailtoke[:-4]+'%3D', sign_key)
    # LOLLLLLLLLLLLLLLLLLLLLLLLLL
    time.sleep(1)
    receive_content = requests.get(receive_url, headers=headers_fake).content

    try:
        return_json_data = json.loads(receive_content)
        if return_json_data['retmsg'] == 'ok':
            money_count = return_json_data['amount'] * 0.01
            print '[+] Success: %s$' % money_count
            return money_count
        else:
            print '[-] Status: %s' % return_json_data['retmsg']
    except Exception, e:
        print str(e)

#!/usr/bin/env python

# author : evi1m0, rains

# datetime: 201502

from django.shortcuts import render

from django.http import HttpResponse

import re

import sys

import json

import time

import base64

import urllib

import urllib2

import requests

def index(request):

url = 'http://www.baidu.com'

req = urllib2.urlopen(url)

content = req.read()

return HttpResponse(content)

def open(request, url):

url = urllib.unquote(url).replace('amp;', '')

print url

cookie = "test NULL"

return HttpResponse(_money(url, cookie))

def _money(url, cookie):

headers_fake = {'User-Agent': ("Mozilla/5.0 (Linux; U; Android 4.2.2; zh-cn; Galaxy Nexus - 4.2.2 - with Google Apps"

"- API 17 - 720x1280 1 Build/JDQ39E) AppleWebKit/534.30 (KHTML, like Gecko)"

"Version/4.0 Mobile Safari/534.30 MicroMessenger/5.3.0.80_r701542.440"),

'X-Requested-With': 'com.tencent.mm',

'Cookie': cookie,

}

try:

req_key_content = requests.get(url, headers=headers_fake).content

except Exception,e:

print e

try:

g_sendld = re.findall('g_sendId: "(.*?)",', req_key_content)

g_sendnick = re.findall('g_sendNick: "(.*?)",', req_key_content)

g_detailtoke = re.findall('g_detailToke: "(.*?)",', req_key_content)

g_detailtoke = (g_detailtoke[0])

except Exception, e:

print '[-] Error: %s' % str(e)

return False

sign_key = (str(url.split('&')[-1:]).split('=')[1])[:-2]

receive_url = ("https://wxapp.tenpay.com/app/v1.0/wxhb_open.cgi?msg_type=&send_id=%s&channel_id=&detailToke=%s&scene="

"&us=&sign=%s&attention=0&hb_version=v2&ver=2&isappinstalled=0&clientversion=25030050&devicetype=android"

"-17")

receive_url = receive_url % (g_sendld[0], g_detailtoke[:-4]+'%3D', sign_key)

# LOLLLLLLLLLLLLLLLLLLLLLLLLL

time.sleep(1)

receive_content = requests.get(receive_url, headers=headers_fake).content

try:

return_json_data = json.loads(receive_content)

if return_json_data['retmsg'] == 'ok':

money_count = return_json_data['amount'] * 0.01

print '[+] Success: %s$' % money_count

return money_count

else:

print '[-] Status: %s' % return_json_data['retmsg']

except Exception, e:

print str(e)

End

文中部分代码和图片因时间无法全面提供，修复后不再传输红包地址：

如果你要问现在还有没有新的方法，嗯是有的。

作者：niubl | Categories:技术分享 | Tags:

一条评论

haotie说道：

2016 年 3 月 11 日下午 8:08

cool !

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通用型微信抢红包神器（已修复）

WebAPI

Process

Code

End

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