alert tcp $EXTERNAL_NET any -> $HOME_NET 79 (msg:"GPL SCAN Finger . query"; flow:to_server,established; content:"."; reference:arachnids,130; reference:cve,1999-0198; reference:nessus,10072; classtype:attempted-recon; sid:2100333; rev:10; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)