alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (ACBackdoor CnC)"; flow:established,from_server; tls.cert_serial; content:"0E:4F:8B:2C:65:0A"; reference:url,www.intezer.com/blog-acbackdoor-analysis-of-a-new-multiplatform-backdoor/; classtype:domain-c2; sid:2029049; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_and_Server, created_at 2019_11_21, deployment Perimeter, malware_family ACBackdoor, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_22, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)