alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg: "BLEEDING-EDGE VIRUS Probable Zafi VIRUS Outbound via SMTP"; flow: to_server; content:"TVqQAAMAAAAEAAAAUEUAAEwBAgBG"; content:"AAAAAAAADgAA8BCwEAAAAuAAAAOgAAAAAAAPu+"; distance: 6; classtype: misc-activity; reference:url,securityresponse.symantec.com/avcenter/venc/data/w32.erkez.a@mm.html; sid: 2000310; rev:8; )