ET MALWARE Ironhalo CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ironhalo CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php"; endswith;
    http.user_agent;
    content:"Mozilla/4.0(compatible|3b|MSIE 8.0|3b|Windows NT 6.1)"; fast_pattern; bsize:47;
    http.header_names;
    content:!"Accept-";
    content:!"Referer|0d 0a|";
    reference:url,fireeye.com/blog/threat-research/2015/12/the-eps-awakens-part-two.html;
    classtype:command-and-control;
    sid:2022298; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2015_12_22, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_06_16, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)