alert tls $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET MALWARE APT CozyCar SSL Cert 3"; flow:established,to_client; tls.cert_subject; content:"C=--"; startswith; content:"ST=SomeState"; content:"root@localhost.localdomain"; fast_pattern; tls.cert_serial; content:"3d:d6"; reference:url,researchcenter.paloaltonetworks.com/2015/07/tracking-minidionis-cozycars-new-ride-is-related-to-seaduke/; classtype:targeted-activity; sid:2021420; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_07_15, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_01;)