alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (TA456 GrumpyGrocer)"; flow:established,to_client; tls.cert_subject; content:"hotjar.info"; fast_pattern; pcre:"/CN=(?:[^\r\n]+?\.)?hotjar\.info(?!\.)/"; classtype:domain-c2; sid:2033188; rev:1; metadata:affected_product Web_Browsers, attack_target Client_and_Server, created_at 2021_06_25, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_25, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)