ET MALWARE FrigidBackdoor Poll for Commands

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE FrigidBackdoor Poll for Commands";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/api/external/machines/commands/"; startswith; fast_pattern;
    http.user_agent;
    content:"Go-http-client";
    http.accept_enc;
    content:"gzip";
    reference:url,moonlock.com/macc-stealer-macsync-backdoor;
    classtype:trojan-activity;
    sid:2064775; rev:1;
    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_09_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)