ET MALWARE Suspicious Long NULL DNS Request - Possible DNS Tunneling

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|"; distance:70; fast_pattern;
content:!"microsoft.com|03|";
Raw source ET MALWARE Suspicious Long NULL DNS Request - Possible DNS Tunneling · 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 MALWARE Suspicious Long NULL DNS Request - Possible DNS Tunneling";
    content:"|01|"; offset:2; depth:1;
    content:"|00 01 00 00 00 00 00|"; distance:1; within:7;
    content:"|00 0a 00 01|"; distance:70; fast_pattern;
    content:!"microsoft.com|03|";
    classtype:trojan-activity;
    sid:2029995; rev:2;
    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 Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_31;
)

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