WORM_VBNA.VIE

This worm also searches for files with certain extension names and drops lnk files with the names of the searched files which are shortcuts to the dropped copy in all removable and network drives.

This worm arrives by connecting affected removable drives to a system. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.

It propagates via shared networks and drops copies of itself into available networks.

It drops copies of itself into all the removable drives connected to an affected system. 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 may arrive via network shares.

It may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

However, as of this writing, the said sites are inaccessible.

Installation

This worm drops the following copies of itself into the affected system:

• %User Temp%\{random}.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp 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
{malware name} = %User Profile%\{random name}.exe

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.)

File Infection

This worm propagates via shared networks and drops copies of itself into available networks.

Propagation

This worm drops copies of itself into all the removable drives connected to an affected system.

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}
[AUtoRun]
{garbage}
ACtiOn=Open folder & view files
{garbage}
shellexecute={malware name}.exe
{garbage}
icOn=%systEMrOOt%\SYsteM32\sHELL32.DLl,4
{garbage}
uSEautopLay=1
{garbage}

Download Routine

This worm accesses the following websites to download files:

• {BLOCKED}1.mediashares.org
• {BLOCKED}1.videoall.net
• {BLOCKED}1.player1253.com

Other Details

Based on analysis of the codes, it has the following capabilities:

• This worm also searches for files with the following extension names and drops lnk files with the names of the searched files which are shortcuts to the dropped copy in all removable and network drives:
  
  • .mp3
  • .avi
  • .wma
  • .wmv
  • .wav
  • .mpg
  • .mp4
  • .doc
  • .txt
  • .pdf
  • .xls
  • .jpg
  • .jpe
  • .bmp
  • .gif
  • .tif
  • .png

It does the following:

• It drops the following LNK files which are shortcuts to the dropped copy in all removable and network drives:
  
  • New Folder.lnk
  • Passwords.lnk
  • Documents.lnk
  • Pictures.lnk
  • Music.lnk
  • Video.lnk