ET INFO Suspicious Domain (*.icu) in TLS SNI

Query · suricata

flow:established,to_server;
threshold:type limit, count 1, track by_src, seconds 120;
tls.sni;
content:".icu"; endswith; fast_pattern; nocase;
Raw source ET INFO Suspicious Domain (*.icu) in TLS SNI · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Suspicious Domain (*.icu) in TLS SNI";
    flow:established,to_server;
    threshold:type limit, count 1, track by_src, seconds 120;
    tls.sni;
    content:".icu"; endswith; fast_pattern; nocase;
    classtype:bad-unknown;
    sid:2026889; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2019_02_06, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_21;
)

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