ET WEB_CLIENT Base64 Encoded Java Value

Query · suricata

flow:established,to_client;
file_data;
content:"<applet";
content:"<param"; distance:0;
content:"<value="; distance:0;
pcre:"/\x3Cvalue\x3D\x22([a-z0-9+/]{4})*(?:[a-z0-9+/]{2}==|[a-z0-9+/]{3}=)/smi";
Raw source ET WEB_CLIENT Base64 Encoded Java Value · 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 Base64 Encoded Java Value";
    flow:established,to_client;
    file_data;
    content:"<applet";
    content:"<param"; distance:0;
    content:"<value="; distance:0;
    pcre:"/\x3Cvalue\x3D\x22([a-z0-9+/]{4})*(?:[a-z0-9+/]{2}==|[a-z0-9+/]{3}=)/smi";
    reference:url,vrt-blog.snort.org/2014/05/continued-analysis-of-lightsout-exploit.html;
    classtype:bad-unknown;
    sid:2018447; rev:3;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_05_05, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26, reviewed_at 2024_03_06;
)

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