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TROJ_GAMARUE.RMA

June 11, 2013
 Analysis by: Rhena Inocencio
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

It is a component of other malware.

  TECHNICAL DETAILS

File Size:

3,275 bytes

File Type:

Other

Initial Samples Received Date:

29 May 2013

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_GAMARUE.LJG

Installation

This Trojan is a component of other malware.

Download Routine

This Trojan accesses the following websites to download files:

  • http://m.{BLOCKED}eavy.ru/m
    • redirects to http://master.dl.sourceforge.net/project/tradingfiles/111/m

It saves the files it downloads using the following names:

  • {removable drive letter}:\Thumbs.db - (encrypted file) WORM_ENCMARUE.LJG

NOTES:
This Trojan arrives in removable drives as desktop.INI. It decrypts Thumbs.DB and saves the decrypted file as follows:

  • %System Root%\MSI\TrustedInstaller.exe - WORM_GAMARUE.LJG

It then executes the decrypted file.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.946.09

FIRST VSAPI PATTERN DATE:

29 May 2013

VSAPI OPR PATTERN File:

9.947.00

VSAPI OPR PATTERN Date:

29 May 2013

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 dropped/downloaded by TROJ_GAMARUE.RMA

    • WORM_GAMARUE.LJG
    • WORM_ENCMARUE.LJG

Step 3

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