W32.Petch

Risk Level 1: Very Low

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Discovered:: October 26, 2003
Updated:: February 13, 2007 12:12:43 PM
Also Known As:: IRC-Worm.Fagot [Kaspersky], Fagot [F-Secure], IRC.Trojan.Fgt
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Petch is a downloaded file that disables firewall and security software. This worm also deletes critical system files and changes the Internet Explorer home page to a pornographic page.

A Web site responsible for distributing this threat is no longer available.

This threat is UPX-packed and written in the Delphi programming language.

Virus definitions dated prior to October 31, 2003 may detect this threat as IRC.Trojan.Fgt.

Antivirus Protection Dates

Initial Rapid Release version October 27, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version October 27, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date October 29, 2003

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: Medium
Threat Containment: Easy
Removal: Difficult

Damage

Damage Level: High

Distribution

Distribution Level: Low

Writeup By: Maryl Magee

Technical Details

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Internet Security Threat Report, Volume 16