Threat Description

VBSWG.N@mm

Details

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

Summary


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



Removal


Automatic action

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

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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



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: http://www.F-Secure.com/v-descs/onthefly.shtml





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


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