alert tcp $EXTERNAL_NET 3306 -> $HOME_NET any (msg:"ET POLICY External MYSQL Server Connection"; flow:established,to_client; content:"|00|"; depth:1; offset:3; classtype:misc-activity; sid:2008572; rev:4; metadata:created_at 2010_07_30, deployment Perimeter, deprecation_reason Performance, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2023_05_04;)