Analysis by: Cris Nowell Pantanilla
 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

Infection Channel: Spammed via email, Downloaded from the Internet, Dropped by other malware

This specially-crafted .DOC file takes advantage of a vulnerability in certain versions of Microsoft Office to execute a malicious component detected as BKDR_POISON.BJP. As a result, routines of the .DLL file are then exhibited on the affected system.

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: 33,792 bytes
File Type: DOC
Initial Samples Received Date: 26 Mar 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 Office to execute a malicious component .DLL file in the malware's current folder.

The said .DLL file is detected by Trend Micro as BKDR_POISON.BJP. Routines of the .DLL file may be exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.866.02
FIRST VSAPI PATTERN DATE: 26 Mar 2012
VSAPI OPR PATTERN File: 8.867.00
VSAPI OPR PATTERN Date: 27 Mar 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDRPR.AA. 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 3

Remove malware files dropped/downloaded by TROJ_MDRPR.AA

Step 4

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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