alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg:"BLEEDING-EDGE VIRUS Bagle.EO or EP Outbound"; flow:to_server,established; content:"UEsDBBQA"; content:"S5leGXtmn"; distance:33; within:35; classtype:trojan-activity; reference:url,www.f-secure.com/v-descs/bagle_eo.shtml; reference:url,www.f-secure.com/v-descs/bagle_ep.shtml; sid:2002689; rev:1;)