alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected UTA0178 Domain in TLS SNI"; flow:established,to_server; tls.sni; content:"gpoaccess.com"; fast_pattern; reference:url,www.volexity.com/blog/2024/01/10/active-exploitation-of-two-zero-day-vulnerabilities-in-ivanti-connect-secure-vpn/; classtype:domain-c2; sid:2050004; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_01_11, deployment Perimeter, confidence High, signature_severity Major, tag SSL_TLS_SNI, 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;)