alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE TROJ_NAIKON.A SSL Cert"; flow:established,to_client; tls.cert_subject; content:"CN=donc"; fast_pattern; content:"OU=abc"; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/targeted-attack-campaign-hides-behind-ssl-communication/; classtype:trojan-activity; sid:2016795; rev:6; metadata:attack_target Client_Endpoint, created_at 2013_04_27, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_23;)