ET MALWARE SysJoker CnC Checkin (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SysJoker CnC Checkin (POST)";
    flow:established,to_server;
    urilen:8;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/req";
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.request_body; bsize:42;
    content:"token="; startswith; fast_pattern;
    pcre:"/^(?:(?:[a-z0-9]{8})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{12}))$/R";
    reference:url,research.checkpoint.com/2023/israel-hamas-war-spotlight-shaking-the-rust-off-sysjoker;
    reference:url,intezer.com/blog/research/wildcard-evolution-of-sysjoker-cyber-threat;
    classtype:trojan-activity;
    sid:2049305; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_11_27, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_31;
)