Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 1,669 bytes
File Type: LNK
Memory Resident: Yes
Initial Samples Received Date: 19 Oct 2010

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be dropped by the following malware:

  • WORM_AUTORUN.FLV

Other Details

Based on analysis of the codes, it has the following capabilities:

  • This is the Trend Micro detection for shortcut files that attempt to exploit a vulnerablity in Windows Shell that could allow execution of arbitrary commands.

  • More information about this vulnerability can be found in this page

  • This .LNK file is usually dropped in removable drives using random file names. It is used to execute the dropped copy of its main component malware.

  SOLUTION

Minimum Scan Engine: 8.900

Step 1

Remove malware files dropped/downloaded by LNK_VBNA.SM

     WORM_AUTORUN.FLV

Step 2

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 3

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