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EXPL_CPLNK.SMA

December 20, 2010
 Analysis by: Marfel Tiamzon
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This malware has a complex and evolving structure and behavior. This .LNK file is used to execute the main component of the malware detected as WORM_TDSS.TX. It exploits a vulnerability in Windows Shell that could allow arbitrary commands to be executed.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This .LNK file is used to execute the main component of the malware detected as WORM_TDSS.TX.

It exploits the following vulnerability in Windows Shell that could allow arbitrary commands to be executed:

  • Vulnerability in Windows Shell Could Allow Remote Code Execution (2286198)

  TECHNICAL DETAILS

File Size:

492 bytes

File Type:

LNK

Memory Resident:

Yes

Initial Samples Received Date:

04 Dec 2010

Other Details

This Trojan does the following:

  • This .LNK file is used to execute the main component of the malware detected as WORM_TDSS.TX.
  • It exploits the following vulnerability in Windows Shell that could allow arbitrary commands to be executed:
    • Vulnerability in Windows Shell Could Allow Remote Code Execution (2286198)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.689.00

VSAPI OPR PATTERN Date:

08 Dec 2010

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 EXPL_CPLNK.SMA. 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 EXPL_CPLNK.SMA

    • WORM_TDSS.TX

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. Microsoft Security Bulletin MS10-046


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