alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Mirrortheif group)"; flow:established,to_client; tls.cert_subject; content:"CN=cloudmetric-analytics.com"; nocase; endswith; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/mirrorthief-group-uses-magecart-skimming-attack-to-hit-hundreds-of-campus-online-stores-in-us-and-canada; classtype:domain-c2; sid:2027322; rev:4; metadata:attack_target Client_and_Server, created_at 2019_05_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)