W2KM_BARTALEX.SYM

August 05, 2015
 Analysis by: Christopher Daniel So
 ALIASES:

TrojanDownloader:O97M/Bartallex (Microsoft), W97M.Downloader (Symantec), W97M/Downloader.alm (McAfee), Trojan-Downloader.MSWord.Agent.qf (Kaspersky), VBA/TrojanDownloader.Agent.ZE (ESET), W97M/Downloader.CZ (F-Prot)

 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:

236,032 bytes

File Type:

DOC

Initial Samples Received Date:

05 Aug 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:

  • %User Temp%\{random number}.vbs
  • %User Temp%\{random number}.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}atables.com/components/com_wrapper/7777.txt
  • http://{BLOCKED}atables.com/components/com_wrapper/rara.txt
  • http://{BLOCKED}ringinternetu.com/components/com_wrapper/7777.txt
  • http://{BLOCKED}ringinternetu.com/components/com_wrapper/rara.txt