Symantec just posted production def's:

Symantec Security Response has posted LiveUpdate and Intelligent Updater
virus definitions containing detection for W32.Netsky.B@mm. This Netsky
variant was discovered on February 18, 2004 and is rated a Category 3
threat. The definitions have a version number of 60218g (20040218.007) and a
Seq Number of 27997.
Have fun.

/edit
And last but not least, the removal tool from Symantec:

Symantec Security Response has posted a Removal Tool for W32.Netsky.B@mm.
The Removal Tool is available for download from the following location:
http://securityresponse.symantec.com...oval.tool.html
Cheers: