Threat Descriptions

VBSWG.N@mm

Classification

Category :

Malware

Type :

Worm

Platform :

VBS

Aliases :

VBSWG.N@mm

Summary

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

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

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: 

Subject:

Fw: FYI

Body: ---------- Forwarded message ---------- Date: Thu, 15 Feb 2001 16:21:42 -0800

 From: Mohammed BagetTo: Eugene SpaffordCc: 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

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