ET INFO Observed Lets Encrypt Certificate for Suspicious TLD (.top)

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:".top"; endswith;
tls.cert_issuer;
content:"Lets Encrypt";
Raw source ET INFO Observed Lets Encrypt Certificate for Suspicious TLD (.top) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET INFO Observed Lets Encrypt Certificate for Suspicious TLD (.top)";
    flow:established,to_client;
    tls.cert_subject;
    content:".top"; endswith;
    tls.cert_issuer;
    content:"Lets Encrypt";
    classtype:bad-unknown;
    sid:2029257; rev:3;
    metadata:created_at 2020_01_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, updated_at 2020_10_27;
)

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