alert tcp $EXTERNAL_NET any -> $HOME_NET 110 (msg:"GPL POP3 PASS format string attempt"; flow:established,to_server; content:"PASS"; nocase; pcre:"/^PASS\s+[^\n]*?%/smi"; reference:bugtraq,10976; classtype:attempted-admin; sid:2102666; rev:3; metadata:created_at 2010_09_23, signature_severity Unknown, updated_at 2024_03_08;)