ET MALWARE Dragonfly Backdoor.Goodor Go Implant CnC Beacon 1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Dragonfly Backdoor.Goodor Go Implant CnC Beacon 1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".";
    content:"?"; distance:3; within:2;
    content:"="; distance:3; within:1;
    content:"&"; distance:32; within:1;
    pcre:"/\.(?:aspx|txt)\?[a-z0-9]{3}=[a-f0-9]{32}&[a-z0-9]{3}=[^&]+&[a-z0-9]{3}=[a-f0-9]{32}$/";
    http.header;
    content:"Go-http-client/1.1|0d 0a|";
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,8943e71a8c73b5e343aa9d2e19002373;
    classtype:command-and-control;
    sid:2024894; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_12, deployment Perimeter, confidence High, signature_severity Major, tag Targeted, tag c2, updated_at 2020_08_12, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)