ET MALWARE Dridex v2 POST Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Dridex v2 POST Checkin";
    flow:established,to_server;
    urilen:>20;
    http.method;
    content:"POST";
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"Accept-Encoding|0d 0a|";
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a|User-Agent|0d 0a|Content-Type|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Authorization|0d 0a|Content-Length|0d 0a 0d 0a|"; startswith;
    http.header;
    content:"Content-Type|3a 20|octet/binary|0d 0a|Accept|3a 20|*/*|0d 0a|"; fast_pattern;
    content:"Authorization|3a 20|Basic";
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\x3a\d{1,5})?$/";
    reference:url,securityblog.s21sec.com/2014/11/dridex-learns-new-trick-p2p-over-http.html;
    classtype:command-and-control;
    sid:2019830; rev:3;
    metadata:created_at 2014_12_01, signature_severity Major, updated_at 2020_05_14;
)