Analysis by: Michael Cabel
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 09 Jun 2010

Other Details

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

  • This is Trend Micro's detection for patched Windows file %System%\sens.dll, modified by a certain malware detected as variants of TROJ_MESOUM family.
  • The patched code is used to enable automatic execution of the said malware at startup. As a result, malicious routine of the said malware are then exhibited on the affected system.

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.229.80
VSAPI PATTERN Date: 09 Jun 2010
VSAPI PATTERN Date: 6/9/2010 12:00:00 AM

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 clean files detected as PE_MESOUM.G. 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.


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