ET RETIRED ZuoRAT CBeacon CnC

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED ZuoRAT CBeacon CnC";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api";
    http.user_agent;
    content:"WinHTTP"; fast_pattern;
    http.connection;
    content:"Keep-Alive";
    http.header_names;
    content:!"Referer";
    content:"Connection|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|Host|0d 0a 0d 0a|";
    http.request_body;
    pcre:"/^[A-Za-z0-9=/+]{100}/";
    reference:url,blog.lumen.com/zuorat-hijacks-soho-routers-to-silently-stalk-networks/;
    classtype:targeted-activity;
    sid:2037143; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_06_28, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family ZuoRAT, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17, reviewed_at 2025_04_17;
)