1. Symantec/
  2. Security Response/
  3. JS.Fortnight.B


Risk Level 1: Very Low

March 19, 2003
February 13, 2007 11:44:37 AM
Also Known As:
JS/Fortnight.b@M [McAfee], JS.Fortnight [KAV], JS_FORTNIGHT.C [Trend]
Trojan Horse, Worm
Systems Affected:

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 here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Douglas Knowles

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