ET MALWARE Arkanix Stealer CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Arkanix Stealer CnC Checkin";
    flow:established,to_server;
    flowbits:set,ET.Arkanix.Checkin;
    http.method;
    content:"POST";
    http.uri; bsize:19;
    content:"/api/session/create";
    http.user_agent; bsize:11;
    content:"Mozilla/5.0";
    http.request_body;
    content:"|22|payload_id|22 3a 22|"; fast_pattern;
    pcre:"/^[a-zA-Z0-9]{31,}/R";
    content:"|22|userid|22 3a 22|";
    content:"|22|desktop_name|22 3a 22|";
    content:"|22|hwid|22 3a 22|";
    reference:url,hunting.abuse.ch/hunt/691d7ec0e73ba/arkanix.pw/#sandnet;
    reference:md5,643696a052ea1963e24cfb0531169477;
    classtype:trojan-activity;
    sid:2065835; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_19, deployment Perimeter, malware_family Arkanix_Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_19, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)