1. Symantec/
  2. Security Response/
  3. W32.Huayu


Risk Level 1: Very Low

October 24, 2004
February 13, 2007 12:29:00 PM
Also Known As:
Systems Affected:

W32.Huayu is a worm that spreads by exploiting the Microsoft Windows LSASS Buffer Overrun Vulnerability, described in Microsoft Security Bulletin MS04-011. It only spreads to IP addresses between and This worm opens a backdoor on infected computers.

Note: Virus definitions dated prior to October 24, 2004 detect this threat as Bloodhound.Exploit.8.

Antivirus Protection Dates

  • Initial Rapid Release version October 24, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version October 24, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date October 27, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Heather Shannon

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