ET HUNTING Suspicious NULL DNS Request

Query · suricata

content:"|01|"; offset:2; depth:1;
content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
content:"|00 0a 00 01|"; fast_pattern; distance:0;
Raw source ET HUNTING Suspicious NULL DNS Request · 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 Suspicious NULL DNS Request";
    content:"|01|"; offset:2; depth:1;
    content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
    content:"|00 0a 00 01|"; fast_pattern; distance:0;
    classtype:misc-activity;
    sid:2029994; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target DNS_Server, created_at 2020_04_22, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_22;
)

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