ET INFO Observed Cloudflare R2 Public Bucket (r2 .dev) Domain in TLS SNI

Query · suricata

flow:established,to_server;
tls.sni; dotprefix;
content:".r2.dev"; endswith; fast_pattern;
pcre:"/pub\x2d[a-f0-9]{32}\x2er2\x2edev/";
target:src_ip;
Raw source ET INFO Observed Cloudflare R2 Public Bucket (r2 .dev) Domain 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 Observed Cloudflare R2 Public Bucket (r2 .dev) Domain in TLS SNI";
    flow:established,to_server;
    tls.sni; dotprefix;
    content:".r2.dev"; endswith; fast_pattern;
    pcre:"/pub\x2d[a-f0-9]{32}\x2er2\x2edev/";
    reference:url,developers.cloudflare.com/r2/buckets/public-buckets/;
    classtype:misc-activity;
    sid:2062569; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_05_27, deployment Perimeter, confidence High, signature_severity Major, updated_at 2025_05_27;
    target:src_ip;
)

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