ET MALWARE Spark RAT CnC Checkin (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Spark RAT CnC Checkin (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"|2f|api|2f|client|2f|update|3f|arch|3d|"; startswith; fast_pattern;
    pcre:"/^(?:386|amd64)/R";
    content:"&commit="; within:8;
    pcre:"/^(?:[a-z0-9]{40})/R";
    content:"&os="; within:4;
    pcre:"/^(?:linux|windows)$/R";
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.content_len;
    content:"384"; bsize:3;
    http.content_type;
    content:"application|2f|octet|2d|stream"; bsize:24;
    http.accept_enc;
    content:"gzip"; bsize:4;
    http.header;
    content:"|0d 0a|Secret|3a 20|";
    pcre:"/^(?:[a-z0-9]{40})/R";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|Content-Type|0d 0a|Secret|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; bsize:77;
    reference:md5,9bcae60b3c1a483b8c233b575aad3f41;
    reference:url,twitter.com/suyog41/status/1693563144617206147;
    classtype:trojan-activity;
    sid:2047681; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2023_08_21, deployment Perimeter, malware_family SparkRAT, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_21, reviewed_at 2023_08_21;
)