Analysis by: RonJay Kristoffer Caragay
ALIASES:

TrojanDownloader:O97M/Donoff (Microsoft); Troj/DocDl-ACT (Sophos); Trojan-Downloader.MSWord.Agent.tg (Kaspersky); X97M/Donoff.I.gen (F=Prot); Trojan-Downloader.O97M.Donoff (Ikarus)

 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 as attachment to mass-mailed email messages.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 69,120 bytes
File Type: XLS
Initial Samples Received Date: 06 Oct 2015

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\zzAjif.exe

(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://www.{BLOCKED}o-zwerfkatten.be/432/4535.exe

However, as of this writing, the said sites are inaccessible.