WORM_DORKBOT.DSS
Trojan-Ransom.Win32.Foreign.rfg(Kaspersky), Win32/Injector.XDT trojan(Eset), Troj/Agent-YAO(Sophos)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 executes then deletes itself afterward.
TECHNICAL DETAILS
177,664 bytes
EXE
Yes
29 Jan 2013
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 files:
- {Drive Letter}:\{folder name}.lnk - if the removable drive contains folders
- {Drive Letter}:\RECYCLED\Desktop.ini
It executes then deletes itself afterward.
Propagation
This worm creates the following folders in all removable drives:
- {Drive Letter}:\RECYCLED
It drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}:\RECYCLED\d1ff3a37.exe
Other Details
This worm connects to the following possibly malicious URL:
- http://www.{BLOCKED}earch.net
- http://{BLOCKED}.{BLOCKED}ia.com
NOTES:
It drops shortcut files pointing to the copy of itself in removable drives. These dropped .LNK files use the names of the folders located on the said drives for their file names. It then sets the attributes of the original folders to Hidden to trick the user into clicking the .LNK files.
SOLUTION
9.300
9.698.02
31 Jan 2013
9.699.00
02 Feb 2013
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 this folder
- {Drive Letter}:\RECYCLED
Step 4
Search and delete this file
- {Drive Letter}:\{folder name}.lnk
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.DSS. 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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