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TROJ_GAMETHI.GST

October 08, 2012
 Analysis by: Marfel Tiamzon
 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

BLOCKED:

http://www.googleccf.com/1mg/am1.rar

http://www.163lou.com/1mg/am.rar

This Trojan may arrive bundled with malware packages as a malware component. It may arrive as a file that exports functions used by other malware. It may be dropped by other malware. It may be dropped by other malware.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

86,016 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

11 Nov 2009

Payload:

Connects to URLs/Ips

Arrival Details

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

It may arrive as a file that exports functions used by other malware.

It may be dropped by other malware.

It may be dropped by the following malware:

  • WORM_AUTORUN.ZZS

Installation

This Trojan stays memory-resident by injecting codes into the following processes:

  • IExplore.exe

Other System Modifications

This Trojan modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 2

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = 0

(Note: The default value data of the said registry entry is 1.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}eccf.com/1mg/am1.rar
  • http://www.{BLOCKED}u.com/1mg/am.rar

It requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.620.01

FIRST VSAPI PATTERN DATE:

11 Nov 2009

VSAPI OPR PATTERN File:

7.119.00

VSAPI OPR PATTERN Date:

21 Apr 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.GST

Step 3

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

Restart in Safe Mode

[ Learn More ]

Step 5

Restore this modified 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\Windows\CurrentVersion\Explorer\Advanced
    • From: Hidden = 2
      To: 1
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: ShowSuperHidden = 0
      To: 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
    • From: CheckedValue = 0
      To: 1

Step 6

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result. files detected earlier


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