ET HUNTING Large non-DNS Packet on Port 53

Query · suricata

dsize:>500;
content:!"|00 01 00 00 00 00 00|"; depth:20;
threshold:type limit,count 1,seconds 300,track by_src;
target:src_ip;
Raw source ET HUNTING Large non-DNS Packet on Port 53 · 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 $HOME_NET any -> $EXTERNAL_NET 53 (
    msg:"ET HUNTING Large non-DNS Packet on Port 53";
    dsize:>500;
    content:!"|00 01 00 00 00 00 00|"; depth:20;
    threshold:type limit,count 1,seconds 300,track by_src;
    reference:url,resecurity.com/es/blog/article/pdfsider-malware-exploitation-of-dll-side-loading-for-av-and-edr-evasion;
    classtype:misc-activity;
    sid:2067113; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_01_26, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_26;
    target:src_ip;
)

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