http://securityresponse.symantec.com/av ... .m@mm.html
Looks like this one will find addresses on your computer, then look up the domains on those addresses on various search engines(Google, Altavista, Lycos etc) and send out e-mails to everything it finds.
More details can be found at the link below.
http://www.msnbc.msn.com/id/5518331/