ET INFO DNS Over HTTP Style Request (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/d?dn="; fast_pattern; startswith;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET INFO DNS Over HTTP Style Request (GET) · 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 -> $EXTERNAL_NET any (
    msg:"ET INFO DNS Over HTTP Style Request (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/d?dn="; fast_pattern; startswith;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:md5,8feb11d15b708736189779ddc51a4a0a;
    classtype:misc-activity;
    sid:2048360; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_09_29, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_29, reviewed_at 2023_09_29;
    target:src_ip;
)

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