W2KM_SHELLLOD.A

June 10, 2015
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

PP97M/ShellCode.B.ge (F-Prot); Troj/VbShlCde-A (Sophos); HEUR:Trojan-Downloader.Script.Generic (Kaspersky); O97M.Donoff.B (CAT-QuickHeal)

 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:

28,195 bytes

File Type:

, DOC, DOCX

Initial Samples Received Date:

07 Jun 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:

  • %User Temp%\comm.bat
  • %User Temp%\services.xml
  • %User Temp%\winservices.bat

(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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.255.19/ksxIDA
  • http://{BLOCKED}.{BLOCKED}.255.19/RfyA
  • http://{BLOCKED}.{BLOCKED}.255.19/qSiR
  • http://{BLOCKED}.{BLOCKED}.255.19/j.ad