ET MALWARE Win32/SparkRAT CnC Checkin (GET)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/SparkRAT CnC Checkin (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/ws"; endswith;
    http.user_agent;
    content:"Go|2d|http|2d|client|2f|1|2e|1";
    http.connection;
    content:"Upgrade"; bsize:7;
    http.header;
    content:"Key|3a 20|";
    pcre:"/^(?:[a-z0-9]{64})\x0d\x0a/R";
    content:"Sec|2d|WebSocket|2d|Version|3a 20|13|0d 0a|";
    content:"UUID|3a 20|";
    pcre:"/^(?:[a-z0-9]{32})\x0d\x0a/R";
    content:"Upgrade|3a 20|websocket";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Connection|0d 0a|Key|0d 0a|Sec-WebSocket-Key|0d 0a|Sec-WebSocket-Version|0d 0a|UUID|0d 0a|Upgrade|0d 0a 0d 0a|"; bsize:96; fast_pattern;
    threshold:type limit,track by_src,count 1,seconds 3600;
    reference:url,sangfor.com/farsight-labs-threat-intelligence/cybersecurity/may-hot-apt-security-events-techniques-tracker;
    classtype:command-and-control;
    sid:2046669; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_27, deployment Perimeter, malware_family SparkRAT, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_10, reviewed_at 2024_01_26;
)