alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB llsrpc unicode bind attempt"; flow:established,to_server; 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 00|P|00|I|00|P|00|E|00 5C 00 00 00|"; distance:4; nocase; byte_jump:2,-17,relative,from_beginning,little; content:"|05|"; distance:4; within:1; byte_test:1,!&,16,3,relative; content:"|0B|"; within:1; distance:1; content:"@|FD|,4l<|CE 11 A8 93 08 00|+.|9C|m"; within:16; distance:29; flowbits:set,smb.tree.bind.llsrpc; classtype:protocol-command-decode; sid:2103100; rev:4; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)