W2KM_DLOADR.YYSXL

January 31, 2017
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

TrojanDownloader:O97M/Donoff.CD (Microsoft); W97M.Downloader (Symantec); Mal/DocDl-J (Sophos); W97M/Downloader.btr (McAfee); VBA/TrojanDownloader.Agent.CJQ (ESET-NOD32); W97M/Dldr.Donoff.AJ (Avira); VBA:Downloader-EFY [Trj] (Avast)

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

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

  TECHNICAL DETAILS

File Size:

117,248 bytes

File Type:

DOC

Initial Samples Received Date:

24 Jan 2017

Arrival Details

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

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

Download Routine

This Trojan saves the files it downloads using the following names:

  • %Application Data%.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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}ards.top/search.php

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