ET WEB_CLIENT PDF With Hidden Embedded File

Query · suricata

flow:established,to_client;
flowbits:isset,ET.pdf.in.http;
file_data;
content:"obj"; distance:0;
content:"<<"; within:4;
content:"/Embeddedfile"; distance:0;
pcre:"/\x3C\x3C[^>]*\x2FEmbeddedfile/sm";

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET WEB_CLIENT PDF With Hidden Embedded File · 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 WEB_CLIENT PDF With Hidden Embedded File";
    flow:established,to_client;
    flowbits:isset,ET.pdf.in.http;
    file_data;
    content:"obj"; distance:0;
    content:"<<"; within:4;
    content:"/Embeddedfile"; distance:0;
    pcre:"/\x3C\x3C[^>]*\x2FEmbeddedfile/sm";
    reference:url,blog.didierstevens.com/2009/07/01/embedding-and-hiding-files-in-pdf-documents/;
    classtype:bad-unknown;
    sid:2019850; rev:2;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_12_03, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;
)

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