1. Symantec/
  2. Security Response/
  3. W32.Naco.B@mm


Risk Level 2: Low

May 26, 2003
February 13, 2007 12:01:41 PM
Also Known As:
W32/Naco.b@MM [McAfee], Win32.Naco.B [CA], WORM_NACO.B [Trend], W32/Anacon-B [Sophos], I-Worm.Nocana.b [KAV]
Systems Affected:
Microsoft IIS, Windows

W32.Naco.B@mm is a mass-mailing worm that attempts to spread itself through the email and file-sharing networks. The worm also contains Backdoor functionality and attempts to replace HTML files on the Microsoft IIS server.

This threat is written in the Microsoft Visual Basic (VB) programming language. The VB run-time libraries are required to execute W32.Naco.B@mm.

NOTE: Due to bugs in the code, W32.Naco.B@mm may not properly work.

Antivirus Protection Dates

  • Initial Rapid Release version May 27, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version May 27, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date May 28, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Robert X Wang

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
  • Twitter
  • Facebook
  • LinkedIn
  • Google+
  • YouTube