alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Turla/Crutch Domain (hotspot .accesscam .org in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".hotspot.accesscam.org"; endswith; fast_pattern; reference:url,www.welivesecurity.com/2020/12/02/turla-crutch-keeping-back-door-open/; classtype:domain-c2; sid:2046761; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_07_07, deployment Perimeter, deprecation_reason Age, malware_family Crutch, confidence High, signature_severity Major, tag Turla, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)