alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (msg:"GPL NETBIOS SMB llsrpc create tree attempt"; flow:established,to_server; flowbits:isset,smb.tree.connect.ipc; content:"|00|"; depth:1; content:"|FF|SMB|A2|"; within:5; distance:3; byte_test:1,!&,128,6,relative; content:"|5C|llsrpc|00|"; within:8; distance:78; nocase; classtype:protocol-command-decode; sid:2103090; rev:5; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)