Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ClearFake Domain (zerosoftware .tech in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".zerosoftware.tech"; endswith; fast_pattern; reference:url,x.com/AvastThreatLabs/status/1802627745949585897; reference:url,x.com/greenplan_it/status/1802981344252719367; classtype:trojan-activity; sid:2053739; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_06_18, deployment Perimeter, deprecation_reason Relevance, malware_family ClearFake, confidence High, signature_severity Major, tag compromised_website, updated_at 2025_04_21, reviewed_at 2025_04_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)