ET INFO Observed Cloudflare Universal (Shared) Certificate, Retired

Query · suricata

flow:established,to_server;
tls.sni;
content:"sni."; depth:4;
pcre:"/(?:/d{6})/R";
content:".cloudflaressl.com"; fast_pattern; offset:9;
Raw source ET INFO Observed Cloudflare Universal (Shared) Certificate, Retired · 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 Observed Cloudflare Universal (Shared) Certificate, Retired";
    flow:established,to_server;
    tls.sni;
    content:"sni."; depth:4;
    pcre:"/(?:/d{6})/R";
    content:".cloudflaressl.com"; fast_pattern; offset:9;
    reference:url,community.cloudflare.com/t/cloudflare-universal-and-universal-shared-certificates/59523;
    classtype:misc-activity;
    sid:2035203; rev:2;
    metadata:created_at 2022_02_15, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_15;
)

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