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W2KM_BARTALEX.XXTF

June 18, 2015
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Trojan-Downloader.MSWord.Agent.mo (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

71,680 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

16 Jun 2015

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\{random numbers}.vbs
  • %User Temp%\{random numbers}.bat
  • %User Temp%\{random numbers}.ps1 (For OS Version Vista and above)

(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.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • HTTP://{BLOCKED}ADOYLESTOWN.COM/WP-CONTENT/THEMES/CHERRYFRAMEWORK/IMAGES/PRETTYPHOTO/LIGHT_SQUARE/89172387.TXT
  • HTTP://{BLOCKED}ESPRESSO.COM/SHOP/WP-INCLUDES/JS/TINYMCE/THEMES/ADVANCED/SKINS/WP_THEME/IMG/89172387.TXT

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

NOTES:

The MS Word document which contains malicious macro code contains the following message:

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.734.07

FIRST VSAPI PATTERN DATE:

16 Jun 2015

VSAPI OPR PATTERN File:

11.735.00

VSAPI OPR PATTERN Date:

17 Jun 2015

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
%User Temp%\{random number}.bat
%User Temp%\{random number}.vbs
%User Temp%\{random number}.ps1 - for Windows Vista and above

Step 3

Scan your computer with your Trend Micro product to delete files detected as W2KM_BARTALEX.XXTF. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 4

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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