ET MALWARE Gulpix/PlugX Client Request

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Gulpix/PlugX Client Request";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.header;
    content:"1|3a 20|";
    content:"2|3a 20|"; distance:0;
    content:"3|3a 20|"; distance:0;
    pcre:"/^(?P<vname>[^\r\n\x3a]+)(?P<n1>[0-4])\x3a\x20\d+\r\n(?P=vname)(?P<n2>((?!(?P=n1))[0-4]))\x3a\x20\d+\r\n(?P=vname)(?P<n3>((?!((?P=n1)|(?P=n2)))[0-4]))\x3a\x20\d+\r\n(?P=vname)(?:(?!((?P=n1)|(?P=n2)))[0-4])\x3a\x20\d+\r\n/m";
    http.header_names;
    content:!"Referer";
    reference:md5,663d7774b6727a070b558676cee9fe43;
    reference:url,www.fireeye.com/blog/technical/targeted-attack/2014/02/operation-greedywonk-multiple-economic-and-foreign-policy-sites-compromised-serving-up-flash-zero-day-exploit.html;
    classtype:trojan-activity;
    sid:2018169; rev:6;
    metadata:created_at 2014_02_21, signature_severity Major, updated_at 2020_08_18;
)