alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Meterpreter Paranoid Mode CnC)"; flow:established,to_client; tls.cert_subject; content:"C=US, ST=Texas, L=Austin, O=Development, CN=www.example.com"; bsize:59; fast_pattern; tls.cert_issuer; content:"C=US, ST=Texas, L=Austin, O=Development, CN=www.example.com"; bsize:59; reference:md5,7f969b888db2ac8aec19f2997167253e; reference:url,titanwolf.org/Network/Articles/Article?AID=97b8845a-85d0-407a-b14b-8dc773ed551b; classtype:domain-c2; sid:2033626; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2021_07_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)