alert tcp $EXTERNAL_NET any -> $HOME_NET 79 (msg:"GPL SCAN Finger Redirection Attempt"; flow:to_server,established; content:"@"; reference:arachnids,251; reference:cve,1999-0105; reference:nessus,10073; classtype:attempted-recon; sid:2100330; rev:11; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)