ET INFO Executable Download from dotted-quad Host

Query · suricata

flow:established,to_server;
http.uri;
content:".exe"; endswith; nocase;
http.host;
content:"."; offset:1; depth:3;
content:"."; within:4;
content:"."; within:4;
pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/";
http.request_line;
content:".exe HTTP/1."; fast_pattern;
Raw source ET INFO Executable Download from dotted-quad Host · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Executable Download from dotted-quad Host";
    flow:established,to_server;
    http.uri;
    content:".exe"; endswith; nocase;
    http.host;
    content:"."; offset:1; depth:3;
    content:"."; within:4;
    content:"."; within:4;
    pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/";
    http.request_line;
    content:".exe HTTP/1."; fast_pattern;
    classtype:bad-unknown;
    sid:2016141; rev:9;
    metadata:attack_target Client_and_Server, created_at 2013_01_03, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2024_04_09;
)

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