alert tcp $EXTERNAL_NET any -> $HOME_NET 79 (msg:"GPL SCAN Finger 0 Query"; flow:to_server,established; content:"0"; reference:arachnids,131; reference:arachnids,378; reference:cve,1999-0197; reference:nessus,10069; classtype:attempted-recon; sid:2100332; rev:10; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)