alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DemonHavoc CnC Activity (POST) M4"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:25; content:"/a817b028fe/307c2b4390bb/"; fast_pattern; http.user_agent; content:"Chrome|2f|96|2e|0|2e|4664|2e|110"; reference:url,huntress.com/blog/fake-tech-support-havoc-command-control; classtype:command-and-control; sid:2068166; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_03_12, deployment Perimeter, deployment SSLDecrypt, malware_family Havoc, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_03_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)