ET MALWARE Sysget/HelloBridge HTTP GET CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Sysget/HelloBridge HTTP GET CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?fn="; fast_pattern;
    pcre:"/&(?:uid|name|file)=[a-f0-9]+$/";
    http.header_names;
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:url,researchcenter.paloaltonetworks.com/2015/04/unit-42-identifies-new-dragonok-backdoor-malware-deployed-against-japanese-targets/;
    classtype:command-and-control;
    sid:2020921; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_04_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_30, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)