1. Symantec/
  2. Security Response/
  3. W32.Opasa@mm


Risk Level 2: Low

April 20, 2004
February 13, 2007 12:21:39 PM
Also Known As:
WORM_MIMAIL.V [Trend], W32/Mimail-V [Sophos], JS.Mimail.V [Computer Associat
Systems Affected:

W32.Opasa@mm is a mass-mailing worm that:
  • Sends itself to the email addresses that it finds on an infected computer
  • Terminates processes and services, including various security programs
  • Attempts to connect to various IRC servers to wait for additional commands from an attacker.

The email contains a .zip attachment, and the Subject line varies.

Antivirus Protection Dates

  • Initial Rapid Release version April 20, 2004
  • Latest Rapid Release version August 8, 2016 revision 023
  • Initial Daily Certified version April 20, 2004
  • Latest Daily Certified version August 9, 2016 revision 001
  • Initial Weekly Certified release date April 20, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Robert X Wang

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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