alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Sidewinder APT CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=reawk.net"; nocase; endswith; reference:md5,9b1d0537d0734f1ddb53c5567f5d7ab5; classtype:domain-c2; sid:2028986; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2019_11_15, deployment Perimeter, malware_family Sidewinder_APT, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_11_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)