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W2KM_DLOADR.XTSC

April 01, 2015
 Analysis by: Miguel Carlo Ang
 ALIASES:

W97M.Downloader(Symantec);W97M/Downloader.afa(McAfee);VBA/TrojanDownloader.Agent.LJ(ESET-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size:

230,400 bytes

File Type:

DOC

Initial Samples Received Date:

24 Mar 2015

Arrival Details

This Trojan 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:

  • %Temp%\444.exe (For Windows XP and below)
  • %User Temp%\adobeacd-update.ps1 (For Windows Vista and above)
  • %User Temp%\adobeacd-update.vbs (For Windows Vista and above)
  • %User Temp%\444.jpg (For Windows Vista and above)
  • %User Temp%\adobeacd-update.bat (For Windows Vista and above)

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ative.com/wp-content/plugins/wp_add/high.jpg
  • http://{BLOCKED}c.su/5462667.png