ET HUNTING Observed Nighthawk 404 Server Response

Query · suricata

flow:established,to_client;
http.stat_code;
content:"404";
http.header;
content:"X-Test|3a 20|2|0d 0a|"; fast_pattern;
file.data;
content:"Nothing to see here.";
target:src_ip;
Raw source ET HUNTING Observed Nighthawk 404 Server Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Observed Nighthawk 404 Server Response";
    flow:established,to_client;
    http.stat_code;
    content:"404";
    http.header;
    content:"X-Test|3a 20|2|0d 0a|"; fast_pattern;
    file.data;
    content:"Nothing to see here.";
    reference:url,twitter.com/1ZRR4H/status/1600569404705619988;
    reference:url,twitter.com/1ZRR4H/status/1615791320982818830;
    classtype:bad-unknown;
    sid:2043331; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_01_18, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_18;
    target:src_ip;
)

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