ET MALWARE Linux/Moose HTTP CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Linux/Moose HTTP CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?p="; fast_pattern;
    content:"&f="; distance:0;
    content:"&m="; distance:0;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:url,welivesecurity.com/wp-content/uploads/2015/05/Dissecting-LinuxMoose.pdf;
    classtype:command-and-control;
    sid:2021147; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_05_26, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_05_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)