ET MALWARE FrigidBackdoor Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE FrigidBackdoor Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/external/machines/me";
    http.user_agent;
    content:"Go-http-client";
    http.request_body;
    content:"|22|machine|5f|id|22 3a|"; fast_pattern;
    content:"|22|hostname|22 3a|"; distance:0;
    content:"|22|username|22 3a|"; distance:0;
    content:"|22|os|22 3a|"; distance:0;
    content:"|22|platform|22 3a|"; distance:0;
    content:"|22|arch|22 3a|"; distance:0;
    reference:url,moonlock.com/macc-stealer-macsync-backdoor;
    classtype:trojan-activity;
    sid:2064774; rev:2;
    metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_09_17, deployment Perimeter, confidence High, signature_severity Major, tag Stealer, tag Backdoor, tag Description_Generated_By_Proofpoint_Nexus, tag FrigidStealer, tag FrigidBackdoor, updated_at 2025_10_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)