Analysis by: Kathleen Notario
 Modified by: Christopher Daniel So

 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 may be dropped by other malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: LNK
Memory Resident: No
Initial Samples Received Date: 03 Aug 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_OTORUN.ASH
  • WORM_SALITY.RL
  • TROJ_ZBOT.BXW
  • WORM_WEBMONER.JC
  • WORM_OTORUN.KR

NOTES:

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

This malware is usually used as an autostart mechanism to automatically execute the main malware.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 7.358.11
FIRST VSAPI PATTERN DATE: 03 Aug 2010
VSAPI OPR PATTERN File: 7.359.00
VSAPI OPR PATTERN Date: 03 Aug 2010

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files that dropped/downloaded EXPL_CPLNK.SM

Step 3

Scan your computer with your Trend Micro product to delete files detected as EXPL_CPLNK.SM. 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.


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