Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan comes with a .DLL file which is executed when Microsoft Word is successfully exploited.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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: 22,016 bytes
File Type: DOC
Initial Samples Received Date: 10 Feb 2012
Payload: Executes files

Arrival Details

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

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

Other Details

More information on this vulnerability can be found below:

NOTES:

This specially-crafted .DOC file takes advantage of a vulnerability in certain versions of Microsoft Word to execute a file named fputlsat.dll in the malware's current folder. After successfully executing the .DLL file, it then deletes the file and drop a non-malicious file named Thumbs.db in the malware's current folder.

As a result, routines of the .DLL file are then exhibited on the affected system.

The said .DLL file is detected by Trend Micro as TROJ_MULDROP.IC.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.768.02
FIRST VSAPI PATTERN DATE: 10 Feb 2012
VSAPI OPR PATTERN File: 8.769.00
VSAPI OPR PATTERN Date: 11 Feb 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_ACTIVEHIJ.A

Step 3

Search and delete this file

[ Learn More ]
There may be some component 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.
  • %Current Folder%\Thumbs.db

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_ACTIVEHIJ.A. 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 5

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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