alert tcp $EXTERNAL_NET 1024:65535 -> $HOME_NET any (msg:"ET POLICY TLS/SSL Server Key Exchange on Unusual Port"; flowbits:isset,BS.SSL.Client.Hello; flow:established; content:"|16 03 01|"; content:"|0c|"; within:6; flowbits:set,BS.SSL.Server.Key; flowbits:noalert; classtype:unusual-client-port-connection; sid:2003014; rev:7; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)