alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (CobaltStrike CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=sammitng.com"; nocase; endswith; reference:md5,b656845e2755920db24364b42ce2ea18; reference:url,thedfirreport.com/2021/09/13/bazarloader-to-conti-ransomware-in-32-hours/; classtype:domain-c2; sid:2033988; rev:1; metadata:attack_target Client_and_Server, created_at 2021_09_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)