alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"🐾 - 🚨 Suspicious TLS Certificate - Possible 👿 Havoc / Havokiz / Sliver 🪟 flow with C2 Server"; flow:to_client, stateless; tls.cert_subject; content:"C=US"; content:"ST="; pcre:"/ST=[a-zA-Z\t]{0,15}/"; content:"L="; pcre:"/L=[a-zA-Z\t]{0,35}/"; content:"street"; content:"postalCode="; fast_pattern; pcre:"/postalCode=[0-9]{4}/"; content:"CN="; pcre:"/CN=[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}/"; tls.cert_issuer; content:"C=US"; content:"ST="; pcre:"/ST=[a-zA-Z\t]{0,15}/"; content:"L="; pcre:"/L=[a-zA-Z\t]{0,35}/"; content:"street"; content:"postalCode="; pcre:"/postalCode=[0-9]{4}/"; content:"CN="; pcre:"/CN=[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}/"; reference:url,https://malpedia.caad.fkie.fraunhofer.de/details/win.havoc; reference:url,https://malpedia.caad.fkie.fraunhofer.de/details/win.sliver; reference:url,https://github.com/BishopFox/sliver/blob/97d3da75b6e24defb3a2a97443a15a632b3a8448/server/certs/subject.go; reference:url,https://attack.mitre.org/techniques/T1071/001/; metadata:attack_target Client_and_Server, signature_severity Major, affected_product Windows_XP_Vista_7_8_10_11_Server_32_64_Bit, mitre_tactic_id TA0011, mitre_tactic_name Command_and_Control, mitre_technique_id T1071.001, mitre_technique_name Application_Layer_Protocol_Web_Protocols, former_category MALWARE, malware_family Havoc, created_at 2024_01_11, updated_at 2024_02_21; sid:3301117; rev:15; classtype:command-and-control;)