alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"ET NETBIOS NETBIOS SMB DCERPC NetrpPathCanonicalize request (possible MS06-040)"; flow:to_server,established; content:"|00|"; depth:1; content:"|FF|SMB|25|"; depth:5; offset:4; nocase; byte_test:2,^,1,5,relative; content:"&|00|"; within:2; distance:56; content:"|5C|PIPE|5C 00 05 00|"; within:9; distance:4; content:"|1f 00|"; distance:20; within:2; reference:url,www.microsoft.com/technet/security/bulletin/MS06-040.mspx; classtype:misc-attack; sid:2003081; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)