Analysis by: Sammy Chua
ALIASES:

W97M/Downloader.abb (McAfee); Trojan-Downloader.VBA.Agent (IKARUS); WM/Agent!tr (Fortinet)

 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: 166,736 bytes
File Type: DOCX
Initial Samples Received Date: 05 Jan 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.

Dropping Routine

This Trojan drops the following files:

  • c:\Windows\Temp\adobeacd-update.bat - hardcoded directory for Windows XP and below
  • c:\Windows\Temp\adobeacd-updatexp.vbs - hardcoded directory for Windows XP and below
  • c:\Windows\Temp\444.exe - hardcoded directory
  • c:\Users\{username}\AppData\Local\Temp\adobeacd-update.ps1 - hardcoded directory for Windows Vista and above
  • c:\Users\{username}\AppData\Local\Temp\adobeacd-update.bat - hardcoded directory for Windows Vista and above
  • c:\Users\{username}\AppData\Local\Temp\adobeacd-update.vbs - hardcoded directory for Windows Vista and above

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}k.kz/wp-content/plugins/wp_module/zat.exe