ET EXPLOIT Possible BIND9 DoS CVE-2015-5477 M1

Query · suricata

content:"|01 00 00 01 00 01|"; depth:6; offset:2;
pcre:"/^.{4}[^\x00]+\x00/R";
content:"|00 f9|"; within:2; fast_pattern;
pcre:"/^..[^\x00]+\x00/Rs";
content:!"|00 f9|"; within:2;
threshold:type limit, track by_src, seconds 60, count 1;
Raw source ET EXPLOIT Possible BIND9 DoS CVE-2015-5477 M1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert udp any any -> any 53 (
    msg:"ET EXPLOIT Possible BIND9 DoS CVE-2015-5477 M1";
    content:"|01 00 00 01 00 01|"; depth:6; offset:2;
    pcre:"/^.{4}[^\x00]+\x00/R";
    content:"|00 f9|"; within:2; fast_pattern;
    pcre:"/^..[^\x00]+\x00/Rs";
    content:!"|00 f9|"; within:2;
    threshold:type limit, track by_src, seconds 60, count 1;
    reference:cve,2015-5477;
    classtype:attempted-dos;
    sid:2021572; rev:3;
    metadata:created_at 2015_08_01, cve CVE_2015_5477, confidence Medium, signature_severity Major, updated_at 2023_05_24;
)

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