alert tcp $HOME_NET any -> $EXTERNAL_NET 1024:65535 (msg:"ET POLICY TLS/SSL Client Hello on Unusual Port SSLv3"; flowbits:isnotset,BS.SSL.Known.Port; flowbits:isnotset,BS.SSL.Client.Hello; flow:established,to_server; content:"|16 03 00|"; depth:3; content:"|01|"; within:2; content:"|03 00|"; within:3; flowbits:set,BS.SSL.Client.Hello; flowbits:noalert; classtype:unusual-client-port-connection; sid:2003003; rev:8; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)