alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:"GPL NETBIOS SMB DCERPC invalid bind attempt"; flow:to_server,established; content:"|FF|SMB%"; depth:5; offset:4; nocase; content:"&|00|"; within:2; distance:56; content:"|5C 00|P|00|I|00|P|00|E|00 5C 00|"; within:12; distance:5; nocase; content:"|05|"; within:1; distance:2; content:"|0B|"; within:1; distance:1; byte_test:1,&,1,0,relative; content:"|00|"; within:1; distance:21; classtype:attempted-dos; sid:2102191; rev:4; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)