ET HUNTING Self-Signed Cert O=XX Observed

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"O=XX"; fast_pattern;
tls.cert_issuer;
content:"O=XX";
Raw source ET HUNTING Self-Signed Cert O=XX Observed · 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 443 -> $HOME_NET any (
    msg:"ET HUNTING Self-Signed Cert O=XX Observed";
    flow:established,to_client;
    tls.cert_subject;
    content:"O=XX"; fast_pattern;
    tls.cert_issuer;
    content:"O=XX";
    reference:md5,00e7afce84c84cd70fe329d8bb8c0731;
    classtype:trojan-activity;
    sid:2018284; rev:5;
    metadata:attack_target Client_Endpoint, created_at 2014_03_17, deployment Perimeter, confidence Medium, signature_severity Minor, updated_at 2022_06_28, reviewed_at 2024_04_23;
)

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