ET HUNTING Hidden embedded HTML Document

Query · suricata

flow:established,to_client;
file.data;
content:"<embed src=|27|data|3a|text/html|3b|base64|2c|PCFET0NUWVBFIGh0bWw+";
content:"|27 20|height|3d 27|0|27 20|frameborder|3d 27|0|27 3e 3c 2f|embed|3e|"; within:6000;
Raw source ET HUNTING Hidden embedded HTML Document · 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 http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Hidden embedded HTML Document";
    flow:established,to_client;
    file.data;
    content:"<embed src=|27|data|3a|text/html|3b|base64|2c|PCFET0NUWVBFIGh0bWw+";
    content:"|27 20|height|3d 27|0|27 20|frameborder|3d 27|0|27 3e 3c 2f|embed|3e|"; within:6000;
    reference:url,cujo.com/dns-hijacking-attacks-on-home-routers-in-brazil/;
    classtype:bad-unknown;
    sid:2031803; rev:1;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2021_03_03, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2021_03_03;
)

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