alert tcp $EXTERNAL_NET any -> $HOME_NET 110 (msg:"GPL POP3 PASS format string attempt"; flow:to_server,established; content:"PASS"; nocase; pcre:"/^PASS\s+[^\n]*?%/smi"; reference:bugtraq,10976; classtype:attempted-admin; sid:2102666; rev:2; metadata:created_at 2010_09_23, signature_severity Unknown, updated_at 2019_07_26;)