alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FrigidBackdoor Log Results"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:29; content:"/api/external/machines/result"; fast_pattern; http.user_agent; content:"Go-http-client"; http.content_type; content:"application/json"; http.request_body; content:"command_id"; content:"output"; distance:0; content:"error"; distance:0; content:"exit_code"; distance:0; reference:url,moonlock.com/macc-stealer-macsync-backdoor; classtype:trojan-activity; sid:2064779; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_09_18, deployment Perimeter, confidence High, signature_severity Major, tag Backdoor, tag c2, tag Description_Generated_By_Proofpoint_Nexus, tag FrigidBackdoor, updated_at 2025_09_18, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)