Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan executes when a user accesses certain websites where it is hosted. It may be hosted on a website and run when a user accesses the said website.

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

  TECHNICAL DETAILS

File Size: Varies
File Type: Script
Memory Resident: No
Initial Samples Received Date: 11 Oct 2010

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

It may be hosted on a website and run when a user accesses the said website.

Installation

This Trojan drops the following files:

  • %User Temp%\svchost.exe - detected as TROJ_MEREDROP.WJ

(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.)

Dropping Routine

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
VSAPI PATTERN File: 7.531.80
VSAPI PATTERN Date: 11 Oct 2010
VSAPI PATTERN Date: 10/11/2010 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

Remove malware files dropped/downloaded by VBS_RAMNIT.SMD

     TROJ_MEREDROP.WJ

Step 3

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