Trojan.Holax

Risk Level 1: Very Low

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Discovered:: January 19, 2005
Updated:: February 13, 2007 12:32:48 PM
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

Trojan.Holax is a Trojan horse program that displays advertisements using Microsoft Internet Explorer. The Trojan modifies files so that it is executed every time Windows starts, and to ensure that it's processes are hidden on the compromised computer.

The Trojan is installed on the compromised computer through a Web page that exploits the Microsoft Outlook Express MHTML Redirection Local File Parsing Vulnerability (as described in the Microsoft Security Bulletin MS04-013).

Antivirus Protection Dates

Initial Rapid Release version January 19, 2005
Latest Rapid Release version March 19, 2012 revision 005
Initial Daily Certified version January 19, 2005
Latest Daily Certified version March 19, 2012 revision 018
Initial Weekly Certified release date January 20, 2005

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: Low

Distribution

Distribution Level: Low

Writeup By: Ka Chun Leung

Technical Details

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Internet Security Threat Report, Volume 16