ET MALWARE SmokeLoader Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SmokeLoader Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; nocase;
    http.header;
    content:"|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a 0d 0a|"; fast_pattern;
    http.user_agent;
    content:"|20|MSIE|20|";
    http.request_body;
    pcre:"/^\d+$/";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|"; depth:14;
    content:!"Referer";
    classtype:command-and-control;
    sid:2017261; rev:7;
    metadata:created_at 2013_08_01, signature_severity Major, updated_at 2020_11_05;
)