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

SID: 2062569Rev: 164 views
Sourceet/open
CreatedMay 27, 2025
UpdatedMay 27, 2025
Classificationmisc-activity
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;)

References

urldevelopers.cloudflare.com/r2/buckets/public-buckets/

Metadata

attack targetClient_Endpoint
created at2025_05_27
deploymentPerimeter
confidenceHigh
signature severityMajor
updated at2025_05_27

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