alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Self Signed SSL Certificate (Snake Oil CA)"; flow:established,to_client; tls.cert_issuer; content:"CN=Snake Oil CA"; fast_pattern; classtype:policy-violation; sid:2013295; rev:3; metadata:attack_target Client_Endpoint, created_at 2011_07_21, deployment Perimeter, confidence High, signature_severity Informational, tag SSL_Malicious_Cert, updated_at 2022_03_23, reviewed_at 2024_03_11;)