WORM_DORKBOT.KX
VirTool:Win32/VBInject(Microsoft), Win32/Dorkbot.A worm(Eset)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system and executes them:
- %Application Data%\{random}.exe - will be deleted afterwards
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following files:
- {Drive Letter}:\BOOTEX.LOG
- {Drive Letter}:\BOOTEX.LOG.LNK
- {Drive Letter}:\.Trashes\Desktop.ini
- {Drive Letter}:\{folder name}.lnk - if the removable drive contains folder
- {Drive Letter}:\{file name}.lnk - if the removable drive contains file
Propagation
This worm creates the following folders in all removable drives:
- {Drive Letter}:\.Trashes
It drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}:\.Trashes\{random}.com
- {Drive Letter}:\{random}.exe
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.246.75/6510.exe
- {BLOCKED}e.{BLOCKED}x.com
It deletes the initially executed copy of itself
NOTES:
This worm drops shortcut files pointing to the copy of itself in removable drives. These dropped .LNK files use the names of the files and folders located on the said drives for their file names.
It then sets the attributes of the original files/folders to Hidden to trick the user into clicking the .LNK files.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Search and delete these folders
- {Drive Letter}:\.Trashes
Step 4
Search and delete this file
- {Drive Letter}:\BOOTEX.LOG
- {Drive Letter}:\BOOTEX.LOG.LNK
- {Drive Letter}:\{folder name}.lnk
- {Drive Letter}:\{file name}.lnk
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.KX. 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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