alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Klingon RAT)"; flow:established,to_client; tls.cert_subject; content:"emailAddress=trump@whitehouse.xyz"; tls.cert_issuer; content:"C=US, ST=Washington, L=Washington, O=White House, OU=Mr President, CN=whitehouse.xyz/emailAddress=trump@whitehouse.xyz"; bsize:118; fast_pattern; reference:url,www.intezer.com/blog/malware-analysis/klingon-rat-holding-on-for-dear-life/; classtype:domain-c2; sid:2033156; rev:2; metadata:attack_target Client_and_Server, created_at 2021_06_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)