W32.Novarg.A@mm is a mass-mailing worm. The worm will arrive as an attachment with a file extension of .bat, .cmd, .exe, .pif, .scr, or .zip.

When the machine gets infected, the worm will set up a backdoor into the system by opening TCP ports 3127 thru 3198. This will potentially allow a hacker to connect to the machine and utilize it as a proxy to gain access to it's network resources. In addition, the backdoor has the ability to download and execute arbitrary files.

The worm will perform a DoS starting on February 1, 2004. On February 12, 2004 the worm has a trigger date to stop spreading.

http://securityresponse.symantec.com/avcenter/venc/data/w32.novarg.a@mm.html

Symantec class 4 worm...

http://www.theregister.co.uk/content/54/35097.html

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