alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:"GPL NETBIOS SMB-DS DCEPRC ORPCThis request flood attempt"; flow:to_server,established; content:"|05|"; depth:1; content:"|00|"; within:1; distance:1; byte_test:1,&,1,0,relative; content:"|05|"; within:1; distance:21; content:"MEOW"; flowbits:isset,dce.isystemactivator.bind.call.attempt; threshold:type both, track by_dst, count 20, seconds 60; reference:bugtraq,8811; reference:cve,2003-0813; reference:nessus,12206; reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx; classtype:misc-attack; sid:2102496; rev:9; metadata:created_at 2010_09_23, cve CVE_2003_0813, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)