#alert tcp $EXTERNAL_NET any -> $HOME_NET 25 (msg:"BLEEDING-EDGE VIRUS Bagle.gen SMTP Inbound (aka - .BK,.ET,.FT,.JH,Lodear.E,.gen,Mitglieder.GU)"; flow:to_server,established; content:"UEsDBBQA"; content:"AAAAUzM3MDAw"; distance:28; content:"ZXhl7ZpnXBP"; distance:4; classtype:trojan-activity; reference:url,isc.sans.org/diary.php?storyid=937; sid:2002726; rev:3;)