ET MALWARE DCRat CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE DCRat CnC Activity";
    flow:established,to_server;
    urilen:>100;
    http.method;
    content:"GET";
    http.uri.raw;
    content:"=%3D"; fast_pattern;
    http.uri;
    content:".php?";
    pcre:"/^\/[^\r\n]+\.php\?[a-f0-9]{32}(?:=(?:%3D|\x3d)*[A-Za-z0-9%\/]+&[a-f0-9]{32}){4,}=(?:%3D|\x3d)*[A-Za-z0-9%\/]+$/si";
    http.header_names;
    content:"|0d 0a|Host|0d 0a 0d 0a|"; endswith;
    content:!"Referer";
    content:!"Accept";
    content:!"Cache";
    threshold:type limit, track by_src, count 1, seconds 30;
    reference:md5,4467b54917f60b657e0c92df4296cbc1;
    classtype:command-and-control;
    sid:2029897; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_13, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Major, updated_at 2020_07_07;
)