ET MALWARE Dridex POST CnC Beacon 2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Dridex POST CnC Beacon 2";
    flow:established,to_server;
    urilen:1;
    content:"|0d 0a 0d 0a|";
    byte_extract:1,0,Dridex.Pivot,relative;
    byte_test:1,!=,Dridex.Pivot,0,relative;
    byte_test:1,=,Dridex.Pivot,7,relative;
    http.method;
    content:"POST";
    http.header;
    content:"Content-Type|3a 20|text/css|0d 0a|Accept|3a 20|image/**|0d 0a|"; fast_pattern;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\x3a\d{1,5})?$/";
    http.header_names;
    content:!"Referer|0d 0a|";
    content:"|0d 0a|Host|0d 0a|"; depth:8;
    reference:md5,b9de687cdae55d3c9fcfe6fc8bcdd28f;
    classtype:command-and-control;
    sid:2020301; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_01_23, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_11_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)