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WORM_AUTORUN.GKD

October 08, 2012
 ALIASES:

W32.IRCBot (Symantec); VirTool:Win32/DelfInject.gen!J (Microsoft)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives

This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

194,499 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

16 Dec 2010

Payload:

Downloads files

Installation

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

  • %System Root%\RECYCLER\{SID}\hdav.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following non-malicious file:

  • %System Root%\RECYCLER\{SID}\Desktop.ini
  • {drive letter}:\DRIVE\Desktop.ini

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\RECYCLER\{SID}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It injects itself into the following processes as part of its memory residency routine:

  • explorer.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = %System Root%\RECYCLER\{SID}\hdav.exe

Propagation

This worm creates the following folders in all removable drives:

  • {drive letter}:\DRIVE

It drops the following copy(ies) of itself in all removable drives:

  • {drive letter}:\DRIVE\file.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[AutoRun]
open=DRIVE\file.exe
icon=%System Root%\system32\SHELL32.dll,2
action=Open folder to view files
shell\open=Open
shell\open\command=DRIVE\file.exe
shell\open\default=1

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Download Routine

This worm accesses the following websites to download files:

  • http://www.{BLOCKED}btown.com/dohk/dope.exe

Trend Micro detects the dowloaded file as:

  • TROJ_DLOAD.ZQKA

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.705.00

VSAPI OPR PATTERN Date:

16 Dec 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 WORM_AUTORUN.GKD

    • TROJ_DLOAD.ZQKA

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Taskman = %System Root%\RECYCLER\{SID}\hdav.exe

Step 5

Search and delete AUTORUN.INF files created by WORM_AUTORUN.GKD that contain these strings

[ Learn More ]
    [AutoRun]
    open=DRIVE\file.exe
    icon=%System Root%\system32\SHELL32.dll,2
    action=Open folder to view files
    shell\open=Open
    shell\open\command=DRIVE\file.exe
    shell\open\default=1

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\RECYCLER\{SID}
  • {drive letter}:\DRIVE

Step 7

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