alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Observed Malicious SSL Cert (Charming Kitten Phishing Domain)"; flow:established,to_client; tls.cert_subject; content:"unirsd.com"; fast_pattern; reference:url,blog.certfa.com/posts/fake-interview-the-new-activity-of-charming-kitten/; classtype:targeted-activity; sid:2029378; rev:1; metadata:affected_product Web_Browsers, attack_target Client_and_Server, created_at 2020_02_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_05, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)