ET DOS DNS Amplification Attack Inbound

Query · suricata

content:"|01 00 00 01 00 00 00 00 00 01|"; depth:10; offset:2;
pcre:"/^[^\x00]+?\x00/R";
content:"|00 ff 00 01 00 00 29|"; within:7; fast_pattern;
byte_test:2,>,4095,0,relative;
threshold:type both, track by_dst, seconds 60, count 5;
Raw source ET DOS DNS Amplification Attack Inbound · 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 udp any any -> $HOME_NET 53 (
    msg:"ET DOS DNS Amplification Attack Inbound";
    content:"|01 00 00 01 00 00 00 00 00 01|"; depth:10; offset:2;
    pcre:"/^[^\x00]+?\x00/R";
    content:"|00 ff 00 01 00 00 29|"; within:7; fast_pattern;
    byte_test:2,>,4095,0,relative;
    threshold:type both, track by_dst, seconds 60, count 5;
    classtype:bad-unknown;
    sid:2016016; rev:8;
    metadata:created_at 2012_12_12, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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