ET MALWARE DCRat Initial CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE DCRat Initial CnC Activity";
    flow:established,to_server;
    urilen:>100;
    http.request_line;
    content:"=c|20|HTTP/1.1"; endswith; fast_pattern;
    http.method;
    content:"GET";
    http.uri;
    content:".php?";
    content:"=c"; distance:32; within:2; endswith;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; endswith;
    content:!"Referer";
    reference:md5,4467b54917f60b657e0c92df4296cbc1;
    classtype:command-and-control;
    sid:2029881; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_13, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Major, updated_at 2020_07_07;
)