ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle USAToday Server]

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle USAToday Server]";
    flow:established,from_server;
    http.response_line;
    content:"HTTP/1."; depth:7;
    http.header;
    content:"Connection|3a 20|close";
    content:"Content-Type|3a 20|application/json|3b 20|charset=utf-8";
    content:"Content-Security-Policy|3a 20|upgrade-insecure-requests";
    content:"Strict-Transport-Security|3a 20|max-age=10890000";
    content:"Cache-Control|3a 20|public, immutable, max-age=315360000";
    content:"Accept-Ranges|3a 20|bytes";
    content:"X-Cache|3a 20|HIT, HIT";
    content:"X-Timer|3a 20|S1593010188.776402,VS0,VE1";
    content:"Vary|3a 20|X-AbVariant, X-AltUrl, Accept-Encoding"; fast_pattern;
    reference:url,github.com/fireeye/red_team_tool_countermeasures;
    classtype:trojan-activity;
    sid:2031274; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_08, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2020_12_09, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)