ET DOS Possible Brute Force Attack Using FastHTTP

Query · suricata

flow:established,to_server;
http.user_agent; bsize:8;
content:"fasthttp"; fast_pattern;
threshold:type both,track by_src,count 1000,seconds 5;
Raw source ET DOS Possible Brute Force Attack Using FastHTTP · 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 $EXTERNAL_NET any -> [$HTTP_SERVERS,$HOME_NET] any (
    msg:"ET DOS Possible Brute Force Attack Using FastHTTP";
    flow:established,to_server;
    http.user_agent; bsize:8;
    content:"fasthttp"; fast_pattern;
    threshold:type both,track by_src,count 1000,seconds 5;
    reference:url,github.com/valyala/fasthttp;
    reference:url,speartip.com/fasthttp-used-in-new-bruteforce-campaign;
    classtype:misc-activity;
    sid:2059376; rev:2;
    metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_21, deployment Perimeter, former_category MALWARE, confidence Medium, signature_severity Minor, tag DDoS, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_01_22;
)

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