ET HUNTING Observed DNS Query for OpenNIC Alternative DNS TLD (.dyn)

Query · suricata

content:"|01|"; offset:2; depth:1;
content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
content:"|03|dyn|00|"; nocase; distance:0; fast_pattern;
Raw source ET HUNTING Observed DNS Query for OpenNIC Alternative DNS TLD (.dyn) · 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 dns $HOME_NET any -> any any (
    msg:"ET HUNTING Observed DNS Query for OpenNIC Alternative DNS TLD (.dyn)";
    content:"|01|"; offset:2; depth:1;
    content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
    content:"|03|dyn|00|"; nocase; distance:0; fast_pattern;
    reference:url,wiki.opennic.org/opennic/dot;
    classtype:bad-unknown;
    sid:2029959; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2020_04_20, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2020_04_20;
)

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