alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (APT32 JEShell CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=stream.playnetflix.com"; nocase; endswith; tls.cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; classtype:domain-c2; sid:2027068; rev:4; metadata:affected_product Java, attack_target Client_and_Server, created_at 2019_03_07, deployment Perimeter, malware_family JEShell, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag APT32, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)