ET MALWARE Felismus CnC Beacon 1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Felismus CnC Beacon 1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?V="; fast_pattern;
    content:"&U="; distance:0;
    http.header;
    content:"Windows NT";
    content:"Referer|3a|";
    content:".php|0d 0a|"; distance:0;
    http.header_names;
    content:!"Accept-";
    reference:url,blogs.forcepoint.com/security-labs/playing-cat-mouse-introducing-felismus-malware;
    reference:md5,8de3f20d94611e0200c484e42093f447;
    classtype:command-and-control;
    sid:2024176; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_04, deployment Perimeter, malware_family Felismus, confidence High, signature_severity Major, tag Felismus, tag c2, updated_at 2020_09_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)