alert tcp any any -> any !$SSH_PORTS (msg:"ET POLICY SSH Client Banner Detected on Unusual Port"; flow:established,to_server; flowbits:isset,ET.is_ssh_server_banner; content:"SSH-"; offset:0; depth:4; byte_test:1,>,48,0,relative; byte_test:1,<,51,0,relative; byte_test:1,=,46,1,relative; flowbits:set,ET.is_ssh_client_banner; classtype:misc-activity; sid:2001980; rev:11; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2022_10_19;)