ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle Original Stager 2]

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle Original Stager 2]";
    flow:established,from_server;
    http.response_line;
    content:"HTTP/1."; depth:7;
    http.header;
    content:"Content-Type|3a 20|text/json|0d 0a|";
    content:"Server|3a 20|Microsoft-IIS/10.0|0d 0a|";
    content:"X-Powered-By|3a 20|ASP.NET|0d 0a|";
    content:"Cache-Control|3a 20|no-cache, no-store, max-age=0, must-revalidate|0d 0a|";
    content:"Pragma|3a 20|no-cache|0d 0a|";
    content:"X-Frame-Options|3a 20|SAMEORIGIN|0d 0a|";
    content:"Connection|3a 20|close|0d 0a|";
    content:"Content-Type|3a 20|image/gif";
    file_data;
    content:"|01 00 01 00 00 02 01 44 00 3b|";
    content:"|ff ff ff 21 f9 04 01 00 00 00 2c 00 00 00 00|"; fast_pattern;
    content:"|47 49 46 38 39 61 01 00 01 00 80 00 00 00 00|";
    reference:url,github.com/fireeye/red_team_tool_countermeasures;
    classtype:trojan-activity;
    sid:2031286; 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;
)