ET MALWARE [ANY.RUN] Win32/Stealc Checkin (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE [ANY.RUN] Win32/Stealc Checkin (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.content_type;
    content:"multipart|2f|form|2d|data|3b 20|boundary|3d|"; startswith;
    pcre:"/^[a-zA-Z0-9]{20}$/R";
    http.header_names;
    content:!"Referer";
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.request_body;
    content:"|2d 2d|"; depth:2;
    content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|hwid|22|"; fast_pattern;
    content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|build|22|";
    threshold:type limit, track by_dst, seconds 300, count 1;
    reference:md5,26f5d78873413d9682031d39733ae5bd;
    reference:url,app.any.run/tasks/a9908b18-0302-4d20-8349-6aca4db61e98;
    reference:url,community.emergingthreats.net/t/stealc-stealer/856;
    classtype:trojan-activity;
    sid:2047625; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_08_11, deployment Perimeter, deployment SSLDecrypt, malware_family Stealc, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_28;
    target:src_ip;
)