Threat Descriptions

Worm:W32/AutoRun.BV

Classification

Category :

Malware

Type :

Worm

Platform :

W32

Aliases :

W32/Voterai.worm, Worm.Win32.AutoRun.bqg, W32/Voter-B

Summary

Worm:W32/AutoRun.BV is a worm that propagates by dropping copies of itself on shared and removable drives. It has the appearance of a document file used for stealth purposes.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

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]\Programs\Startup\[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_USER\Software\Microsoft\Windows\CurrentVersion\Run [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.