ET HUNTING Base64 Encoded octet-stream File in HTML Body (Mime Type)

Query · suricata

flow:established,to_client;
http.response_body;
content:"|3c|html";
content:"data|3a|application|2f|octet|2d|stream|3b|base64|2c|"; fast_pattern; distance:0;
target:dest_ip;
Raw source ET HUNTING Base64 Encoded octet-stream File in HTML Body (Mime Type) · 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 Base64 Encoded octet-stream File in HTML Body (Mime Type)";
    flow:established,to_client;
    http.response_body;
    content:"|3c|html";
    content:"data|3a|application|2f|octet|2d|stream|3b|base64|2c|"; fast_pattern; distance:0;
    classtype:misc-activity;
    sid:2047790; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2023_08_28, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_10_06, reviewed_at 2023_10_06;
    target:dest_ip;
)

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