WORM_DORKBOT.ACE
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
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 connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
79,384 bytes
EXE
Yes
30 Jun 2011
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:
- %User Profile%\Application Data\Fhwuwz.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Propagation
This worm creates the following folders in all removable drives:
- RECYCLER
It drops the following copy(ies) of itself in all removable drives:
- {drive letter}\RECYCLER\e5188982.exe
Download Routine
This worm connects to the following malicious URLs:
- ng.{BLOCKED}oan.com
- ng.{BLOCKED}opperz11.com
- ng.{BLOCKED}housez11.com
- ng.{BLOCKED}allone.com
- ng.{BLOCKED}ketbaby.com
It accesses the following websites to download files:
- http://{BLOCKED}.{BLOCKED}.246.125/gfx2.exe
- http://{BLOCKED}.{BLOCKED}.246.125/dqs.exe
- http://{BLOCKED}.{BLOCKED}.246.125/69z.exe
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This worm deletes the initially executed copy of itself
NOTES:
It searches for folders in removable drives then create a shortcut file as {folder name}.lnk. These shortcut files point to a copy of the malware. It then sets the attribute of the original folder to Hidden and System to trick users into thinking that the LNK file (shortcut file) is the legitimate folder.
SOLUTION
9.200
8.556.04
30 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
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.ACE. 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.
Step 3
Search and delete this folder
- {drive letter}\RECYCLER
Step 4
Search and delete this file
- {folder name}.lnk
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