ET HUNTING Suspicious Request to Image with User-Agent Ending in .exe

Query · suricata

flow:established,to_server;
http.uri;
pcre:"/\.(?:gif|jpe?g|png)$/i";
http.user_agent;
content:".exe"; endswith; fast_pattern;
Raw source ET HUNTING Suspicious Request to Image with User-Agent Ending in .exe · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET HUNTING Suspicious Request to Image with User-Agent Ending in .exe";
    flow:established,to_server;
    http.uri;
    pcre:"/\.(?:gif|jpe?g|png)$/i";
    http.user_agent;
    content:".exe"; endswith; fast_pattern;
    classtype:misc-activity;
    sid:2030732; rev:2;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_08_25, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_25;
)

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