#alert tcp $EXTERNAL_NET any -> $HOME_NET 25 (msg:"BLEEDING-EDGE VIRUS Bagle.ES or ET Inbound"; flow:to_server,established; content:"UEsDBBQA"; content:"TIuZXhl7"; distance:33; within:35; classtype:trojan-activity; reference:url,www.f-secure.com/v-descs/bagle_et.shtml; reference:url,www.f-secure.com/v-descs/bagle_es.shtml; sid:2002690; rev:1;)