Analysis by: Sabrina Lei Sioting
 Modified by: kathleenno
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor opens a hidden Internet Explorer window.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 122,880 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 02 Jun 2011

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
bricks

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
bricks\Recent File List

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
bricks\Settings

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{8326A4E7-E407-101A-90BF-97748999B6F3}

Backdoor Routine

This backdoor opens a hidden Internet Explorer window.

Other Details

This backdoor deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.198.07
FIRST VSAPI PATTERN DATE: 02 Jun 2011

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

Delete this registry key

[ 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
    • Local AppWizard-Generated Applications
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {8326A4E7-E407-101A-90BF-97748999B6F3}

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_AGENT.VTG. 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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