Threat Description



Category: Malware
Type: Worm
Platform: VBS
Aliases: VBSWG.N@mm


On February 20th, this variant of VBS/VBSWG has been found from the field. This variant is not encrypted.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

It spreads in messages with the following content:

  Subject:    Fw: FYI    Body:       ---------- Forwarded message ----------       Date: Thu, 15 Feb 2001 16:21:42 -0800     From: Mohammed Baget      To: Eugene Spafford      Cc: Mark Sawyer     Subject: Fw: New bud commercial!  Spaf,    Here's the new budweiser commercial as promised..    - mb     Mohammed Baget     Head of Communications     Budweiser USA   Attachment: budweiser-commercial-spring2001.mpeg.vbs   

The attachent size about 3.2MB. When it is executed, the worm alters the Internet Explorer start page to point to an adult site. It also modifies the registry in such way that the worm will be executed every time when the system is restarted.

Next the worm sends itself to all recipients in every address book and adds a key to the registry:

  HKEY_CURRENT_USER\software\SP4F\mailog = "1"   

This registry key is used as a marker, so the mass mailing will be done only once.

Information about the original VBS/Onthefly.A (also known as I-Worm.Lee.o and VBS/VBSWG) is available at:

Description Details: Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure; February 2001


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