alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB CoGetInstanceFromFile attempt"; flow:established,to_server; flowbits:isset,dce.isystemactivator.bind; content:"|00|"; depth:1; content:"|FF|SMB%"; within:5; distance:3; byte_test:1,!&,128,6,relative; content:"&|00|"; within:2; distance:56; content:"|5C|PIPE|5C 00|"; distance:4; nocase; byte_jump:2,-17,relative,from_beginning,little; isdataat:4,relative; content:"|05|"; byte_test:1,!&,16,3,relative; content:"|00|"; within:1; distance:1; content:"|00 04|"; within:2; distance:19; content:"|5C 5C|"; byte_test:4,>,256,6; classtype:protocol-command-decode; sid:2103425; rev:4; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)