alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE EtherHiding Exfil M3"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"WindowsPowerShell"; http.content_type; content:"application/json"; http.request_body; strip_whitespace; content:"|22|method|22 3a|"; content:"|22|eth_call|22 2c|"; fast_pattern; content:"|22|params|22 3a|"; content:"|22|to|22 3a|"; pcre:"/0x(?:[a-zA-Z0-9]{40})(?:[\s]\r\n+)?\x22/"; content:"|22|data|22 3a|"; threshold:type limit,count 1,seconds 300,track by_src; classtype:command-and-control; sid:2071682; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_20, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag c2, updated_at 2026_08_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)