alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE BlackEnergy SSL Cert"; flow:established,to_client; tls.certs; content:"|09 00 9a ba cb 13 6d 76 5b 79|"; fast_pattern; tls.cert_subject; content:"C=XX"; content:"L=Default|20|City"; content:"O=Default|20|Company"; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/sandworm-to-blacken-the-scada-connection; classtype:trojan-activity; sid:2019504; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_10_24, deployment Perimeter, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_03;)