alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg:"BLEEDING-EDGE VIRUS Stinx-N SMTP Outbound"; flow:established,to_server; content:"UEsDBBQA"; content:"K5zOzROu"; distance:5; within:13; classtype:trojan-activity; reference:url,www.sophos.com/virusinfo/analyses/trojstinxn.html; reference:url,www.antivirusprogram.se/virusinfo/OutsBot+Family_2855.html; sid:2002793; rev:1;)