Worm:W32/AutoRun.BV is a worm that propagates by dropping copies of itself on shared and removable drives.

It uses the appearance of a document file for stealth purposes.

Upon execution, this worm will drop a copy of itself in the following directory:

• [Windows system directory]drivers

It uses the same file name of the initially executed file, thus the filename may vary.

It also drops the following files in various directories:

• [Desktop]Raila Odinga.gif
  - a non-malicious and damaged image file.
• [Temp][Random Directory]system.dll
  - a non-malicious component file.
• [Start Menu]ProgramsStartup[original worm filename].lnk
  - an auto start link pointing to the dropped malware file.
  

The image file is damaged but contains references to Raila Odinga, a Kenyan politician. The worm attempts to open this file multiple times which can adversely affect the system performance.

It also adds the following registry entry to enable its automatic execution upon system startup:

• HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun
  [Default] = "[Windows system directory]drivers
  [malware filename]"
  

Note: The data in the autostart registry points to the malware but omits the file extension.

It will also attempts to drop copies of itself in writable shared and removable drives.

It can either use the filename of the executed worm or it can obtain filenames from the target directory then change their extension later.

Last update 14 January 2008

 

TOP