alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE EtherHiding Exfil M2"; flow:established,to_server; http.method; content:"POST"; http.content_type; content:"application/json"; http.request_body; content:"|22|method|22 3a 22|eth|5f|call|22|"; fast_pattern; offset:1; content:"|22|params|22 3a 5b 7b 22|to|22 3a 22|"; pcre:"/^(?:[0-9])+(?:[A-Za-z0-9]){41}/R"; reference:url,jscrambler.com/blog/inside-takedown-resistant-skimmer-tricks; classtype:trojan-activity; sid:2065530; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_10_27, deployment Perimeter, malware_family Etherhiding, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, tag EtherHiding, updated_at 2025_10_27;)