ET INFO Observed Let's Encrypt Certificate from Retired Intermediate

Query · suricata

flow:from_server,established;
tls_cert_issuer;
content:"Let's Encrypt Authority X"; fast_pattern; depth:25; offset:0;
Raw source ET INFO Observed Let's Encrypt Certificate from Retired Intermediate · 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 Let's Encrypt Certificate from Retired Intermediate";
    flow:from_server,established;
    tls_cert_issuer;
    content:"Let's Encrypt Authority X"; fast_pattern; depth:25; offset:0;
    reference:url,letsencrypt.org/certificates/;
    classtype:misc-activity;
    sid:2035189; rev:2;
    metadata:created_at 2022_02_14, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_14;
)

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