WORM_AUTORUN.GKD
W32.IRCBot (Symantec); VirTool:Win32/DelfInject.gen!J (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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
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
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
Step 4
Delete this registry value
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
- Taskman = %System Root%\RECYCLER\{SID}\hdav.exe
Step 5
Search and delete AUTORUN.INF files created by WORM_AUTORUN.GKD that contain these 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
Step 6
Search and delete this folder
- %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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