Analysis by: Erika Bianca Mendoza
 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

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 589722 bytes
File Type: DOC
Memory Resident: No
Initial Samples Received Date: 21 Apr 2011
Payload: Drops files

Arrival Details

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

It may be unknowingly downloaded by a user while visiting malicious websites.

NOTES:

Other Details
This is a specially-crafted PDF file that attempts to exploit the folllowing vulnerability in Microsoft Word:

Once successfully exploited, it drops and executes the following malicious file:
  • %Program Files%\Common Files\Microsoft Shared\Winword.exe - detected by Trend Micro as TROJ_STRIGY.A
It then creates a non malicious DOC file and opens it to avoid suspicion:
  • %User Temp%\Word.doc

  SOLUTION

Minimum Scan Engine: 8.900

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_ARTIEF.BE

     TROJ_STRIGY.A

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARTIEF.BE. 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

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.

NOTES:


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