alert tcp $HOME_NET any -> $EXTERNAL_NET [!3389,1024:65535] (msg:"ET INFO TLS/SSL Client Key Exchange on Unusual Port"; flow:established; flowbits:isset,BS.SSL.Client.Hello; content:"|16 03 01|"; content:"|10|"; within:6; classtype:unusual-client-port-connection; sid:2003006; rev:11; metadata:created_at 2010_07_30, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2024_03_15;)