ET MALWARE Dridex Post Check-in Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Dridex Post Check-in Activity";
    flow:established,to_server;
    threshold:type limit,track by_src,count 1,seconds 60;
    http.method;
    content:"POST";
    http.user_agent;
    content:"Mozilla/5.0 (Windows NT 6.1|3b 20|Trident/7.0|3b 20|rv|3a|10.0) like Gecko"; fast_pattern; depth:61; endswith;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/";
    http.connection;
    content:"Close"; depth:5; endswith;
    http.protocol;
    content:"HTTP/1.1";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|"; depth:8;
    content:"Connection|0d 0a|"; distance:0;
    content:!"Referer|0d 0a|";
    reference:md5,ac6ea1e500de772341a2075a7d916d63;
    classtype:trojan-activity;
    sid:2020064; rev:5;
    metadata:created_at 2014_12_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_03;
)