ET HUNTING Suspicious Terse Request for .bmp

Query · suricata

flow:established,to_server;
content:".bmp|20|HTTP/1.1|0d 0a|Host|3a 20|"; fast_pattern;
http.method;
content:"GET";
http.uri;
content:".bmp"; endswith;
http.header_names;
content:!"Accept";
content:!"User-Agent";
content:!"Cache-";
content:!"Pragma";
content:!"Referer";
Raw source ET HUNTING Suspicious Terse Request for .bmp · 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 Terse Request for .bmp";
    flow:established,to_server;
    content:".bmp|20|HTTP/1.1|0d 0a|Host|3a 20|"; fast_pattern;
    http.method;
    content:"GET";
    http.uri;
    content:".bmp"; endswith;
    http.header_names;
    content:!"Accept";
    content:!"User-Agent";
    content:!"Cache-";
    content:!"Pragma";
    content:!"Referer";
    classtype:bad-unknown;
    sid:2030384; rev:1;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2020_06_24, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2020_06_24;
)

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