ET HUNTING PDF extension in DNS TXT Response

Query · suricata

content:"|00 01 00 01 00 00 00 00|"; offset:4; depth:8;
content:"|00 10|"; distance:0;
content:"|2e|pdf|20|"; fast_pattern; distance:0;
target:dest_ip;
Raw source ET HUNTING PDF extension in DNS TXT Response · 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 any any -> $HOME_NET any (
    msg:"ET HUNTING PDF extension in DNS TXT Response";
    content:"|00 01 00 01 00 00 00 00|"; offset:4; depth:8;
    content:"|00 10|"; distance:0;
    content:"|2e|pdf|20|"; fast_pattern; distance:0;
    reference:url,www.malware-traffic-analysis.net/2023/12/07/index.html;
    reference:url,x.com/unit42_intel/status/1732857094167023618;
    classtype:bad-unknown;
    sid:2049649; rev:1;
    metadata:attack_target Client_and_Server, created_at 2023_12_12, deployment Perimeter, deployment Internal, performance_impact Low, confidence Medium, signature_severity Informational, updated_at 2023_12_12;
    target:dest_ip;
)

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