WORM_VOBFUS.SMKT

This worm arrives by connecting affected removable drives to a system. 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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Arrival Details

This worm arrives by connecting affected removable drives to a system.

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%\{random}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

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%\{random}.exe /X"

Other System Modifications

This worm modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0

(Note: The default value data of the said registry entry is 1.)

Propagation

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

• Passwords.exe
• Porn.exe
• Secret.exe
• Sexy.exe
• {random}.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:

{garbage characters}
[autorun]
icOn={random}.exe,0
{garbage characters}
open={random}.exe
{garbage characters}
acTioN=7715
{garbage characters}
usEaUtoPlay=1
{garbage characters}

Other Details

This worm connects to the following possibly malicious URL:

• {BLOCKED}e.{BLOCKED}ermaps.com/c.php
• {BLOCKED}i.{BLOCKED}s.biz
• {BLOCKED}1.{BLOCKED}day1.org
• {5 digit number}.{BLOCKED}s.biz

NOTES:
It also adds the non-malicious file X.MPEG in removable drives.