ET HUNTING Request to .CF Domain with Minimal Headers

Query · suricata

flow:established,to_server;
http.host;
content:".cf"; fast_pattern; endswith;
http.header_names;
content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:22; endswith;
Raw source ET HUNTING Request to .CF Domain with Minimal Headers · 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 Request to .CF Domain with Minimal Headers";
    flow:established,to_server;
    http.host;
    content:".cf"; fast_pattern; endswith;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:22; endswith;
    classtype:bad-unknown;
    sid:2031092; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_23, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_05;
)

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