alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (StrongPity CnC)"; flow:from_server,established; tls.cert_serial; content:"00:B7:E4:D1:83:71:78:B0:A9"; fast_pattern; reference:url,www.bitdefender.com/files/News/CaseStudies/study/353/Bitdefender-Whitepaper-StrongPity-APT.pdf; classtype:domain-c2; sid:2030414; rev:1; metadata:affected_product Web_Browsers, attack_target Client_and_Server, created_at 2020_07_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag StrongPity, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_01, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)