alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE BlackEnergy SSL Cert"; flow:established,to_client; tls.cert_serial; content:"00:E3:6E:25:FE:3F:FA:53:80"; fast_pattern; tls.cert_subject; content:"C=XX"; content:"L=Default City"; reference:url,welivesecurity.com/2016/01/03/blackenergy-sshbeardoor-details-2015-attacks-ukrainian-news-media-electric-industry/; classtype:trojan-activity; sid:2022327; rev:3; metadata:attack_target Client_Endpoint, created_at 2016_01_05, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_23;)