alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE BlackEnergy SSL Cert"; flow:established,to_client; tls.cert_subject; content:"L=Default City"; content:"OU=NETWORK"; content:"CN=144.76.119.48"; fast_pattern; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/sandworm-to-blacken-the-scada-connection; classtype:trojan-activity; sid:2019505; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_10_24, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_23;)