WORM_DORKBOT.AB

This worm arrives via removable drives. It 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 the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes itself after execution.

Arrival Details

This worm arrives via removable drives.

It 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\{random}.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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%User Profile%\Application Data\{random}.exe"

Propagation

This worm creates the following folders in all removable drives:

• {Drive Letter}:\RECYCLER

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

• {Drive Letter}:\RECYCLER\{random}.exe

Download Routine

This worm connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}t.com/img/background.bmp

It saves the files it downloads using the following names:

• %User Profile%\Application Data\{random digit}.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.)

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 connects to the following possibly malicious URL:

• http://api.{BLOCKED}ia.com/
• mxgame.{BLOCKED}8.org
• http://www.{BLOCKED}poli.it/images/8c319f7370b365e8.png

It deletes itself after execution.

NOTES:

This worm drops shortcuts pointing to its copy in all removable drives. These dropped shortcuts use the names of the folders located on the said drives for their file names.