1. Symantec/
  2. Security Response/
  3. W32.Cissi.A@mm


Risk Level 2: Low

December 22, 2003
February 13, 2007 12:15:27 PM
Systems Affected:

W32.Cissi.A@mm is a mass-mailing worm, which also contains backdoor functionality to connect to an IRC server. This worm can also wait for commands.

W32.Cissi.A@mm can spread over the network using the NetBIOS protocol. It can spread to systems that do not have passwords or to ones that have simple passwords.

The worm is written in Delphi and is packed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version December 23, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version December 23, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date December 23, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Neal Hindocha

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