alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (AZORult CnC Server) 2019-09-30"; flow:established,to_client; tls.cert_subject; bsize:12; content:"CN=flozzy.uk"; fast_pattern; reference:md5,6a333c3f54d7fb6efb276cf6e33315c0; reference:md5,ab578cff6c06157aadd5f324a3413973; classtype:domain-c2; sid:2028657; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2019_10_07, deployment Perimeter, malware_family AZORult, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)