ET INFO Lucy Security - Server Reply

Query · suricata

flow:established,to_client;
http.server; bsize:4;
content:"Lucy"; fast_pattern;
http.header;
content:"Cache|2d|Control|3a 20|no|2d|store|2c 20|no|2d|cache|2c 20|must|2d|revalidate|2c 20|post|2d|check|3d|0|2c 20|pre|2d|check|3d|0|0d 0a|";
threshold:type limit, count 1, seconds 600, track by_src;
Raw source ET INFO Lucy Security - Server Reply · Suricata
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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 INFO Lucy Security - Server Reply";
    flow:established,to_client;
    http.server; bsize:4;
    content:"Lucy"; fast_pattern;
    http.header;
    content:"Cache|2d|Control|3a 20|no|2d|store|2c 20|no|2d|cache|2c 20|must|2d|revalidate|2c 20|post|2d|check|3d|0|2c 20|pre|2d|check|3d|0|0d 0a|";
    threshold:type limit, count 1, seconds 600, track by_src;
    classtype:bad-unknown;
    sid:2042970; rev:5;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2022_12_20, deployment Perimeter, deployment SSLDecrypt, malware_family Lucy, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_22;
)

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