alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Owncloud Observed Self Signed TLS Certificate"; flow:established,to_client; tls.cert_subject; content:"CN=owncloud"; nocase; tls.cert_issuer; content:"CN=owncloud"; classtype:policy-violation; sid:2034550; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_11_29, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_29;)