W32.Update.Worm

Risk Level 1: Very Low

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Discovered:: May 28, 2001
Updated:: February 13, 2007 11:48:47 AM
Also Known As:: I-Worm.Mustard, W32.Mustard
Type:: Worm

W32.Update.Worm is a simple mass-mailing worm that can spread using Microsoft Outlook. The worm is written in a high-level language. However, for the email spreading, the worm creates and executes a VBS script. This worm also can also spread using mIRC.

This worm may also attempt to disable Norton AntiVirus, depending on which version is being used and under which operating system.

NOTE: Virus definitions dated prior to May 28 will detect some components of this worm as Bloodhound.VBS.Worm.

Antivirus Protection Dates

Initial Rapid Release version May 28, 2001
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version May 28, 2001
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date pending

Click for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

Wild Level: Low
Number of Infections: 0 - 49
Number of Sites: 0 - 2
Geographical Distribution: Low
Threat Containment: Easy
Removal: Easy

Damage

Damage Level: Medium

Distribution

Distribution Level: Low

Writeup By: Neal Hindocha

Technical Details

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Internet Security Threat Report, Volume 16