JS.Fortnight.B

Risk Level 1: Very Low

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Discovered:: March 19, 2003
Updated:: February 13, 2007 11:44:37 AM
Also Known As:: JS/Fortnight.b@M [McAfee], JS.Fortnight [KAV], JS_FORTNIGHT.C [Trend]
Type:: Trojan Horse, Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

JS.Fortnight.B is a Trojan Horse that drops a file, which is inserted into the default Microsoft Outlook Express signature. Then, every time you send email using Outlook Express, the message will contain code attempting to open a specific Web site when the message is opened.

JS.Fortnight.B also changes the Internet Explorer security settings. It also configures the Web Browser to prepend all the URLs with a specific URL.

This script exploits a known vulnerability in the Microsoft Virtual Machine ActiveX component. For additional information on this vulnerability, refer to: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS00-075.asp.

Security Response recommends installing this patch to remove this security vulnerability.

Antivirus Protection Dates

Initial Rapid Release version March 20, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version March 20, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date March 26, 2003

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

Threat Assessment

Wild

Wild Level: Low
Number of Infections: 50 - 999
Number of Sites: More than 10
Geographical Distribution: Medium
Threat Containment: Easy
Removal: Easy

Damage

Damage Level: Low

Distribution

Distribution Level: Low

Writeup By: Douglas Knowles

Technical Details

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Internet Security Threat Report, Volume 16