Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, 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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

This Trojan takes advantage of software vulnerabilities to allow a remote user or malware/grayware/spyware to download files.

  TECHNICAL DETAILS

File Size: Varies
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 30 May 2009

Download Routine

This Trojan takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware/spyware to download files:

  • Stack-based buffer overflow in CoolType.dll in certain versions of Adobe Reader and Acrobat

Other Details

More information on this vulnerability can be found below:

It does the following:

  • After successfully exploiting the said vulnerability, this malware drops %User Temp%\wuctl.exe, that Trend Micro detects as TROJ_DLOADR.ABJ.

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

NOTES:

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 6.158.08
FIRST VSAPI PATTERN DATE: 30 May 2009
VSAPI OPR PATTERN File: 6.159.00
VSAPI OPR PATTERN Date: 30 May 2009

Step 1

For Windows ME and XP 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_PIDIEF.WQ

    TROJ_DLOADR.ABJ

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.WQ 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 these security patches 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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