Modified by: Christopher Daniel So
ALIASES:

Worm:Win32/Taterf.B (Microsoft), W32.Gammima.AG!gen4 (Symantec), PWS-Mmorpg.gen (McAfee), Trojan-GameThief.Win32.Magania.cznj (Kaspersky), Worm.Win32.Taterf (Sunbelt), W32/Taterf.B!worm (Fortinet)

 PLATFORM:

Windows 2000, XP, 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. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 116,224 bytes
File Type: PE
File Compression: Aspack
Memory Resident: Yes
Initial Samples Received Date: 26 Oct 2009

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Temp%\xvassdf.exe

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Run
54dfsger = "%User Temp%\xvassdf.exe"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\4tddfwq0.dll - detected as TSPY_GAMETHI.AM

(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.)

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 6.958.05
FIRST VSAPI PATTERN DATE: 29 Mar 2010

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 TROJ_GAMETHI.GGU

    TSPY_GAMETHI.AM

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\CurrentVersion\Run
    • 54dfsger=%User Temp%\xvassdf.exe

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_GAMETHI.GGU. 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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