ET MALWARE APT36 Victim Beacon M2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT36 Victim Beacon M2";
    flow:established,to_server;
    http.uri;
    content:"/api/download?exercise="; startswith;
    http.user_agent;
    content:"FitnessTracker/"; startswith; fast_pattern;
    pcre:"/^\d{1,2}\x2e\d{1,5}$/R";
    classtype:command-and-control;
    sid:2068976; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_24, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag c2, tag APT36, updated_at 2026_04_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)