Rule History

SID: 2049251 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 1 • Nov 17, 2023, 12:00 PM

Message:

ET INFO Observed FingerprintJS Domain (openfpcdn .io in TLS SNI)

Rule:

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed FingerprintJS Domain (openfpcdn .io in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".openfpcdn.io"; endswith; fast_pattern; threshold:type limit,seconds 300,count 1,track by_src; reference:url,github.com/fingerprintjs/cdn; classtype:misc-activity; sid:2049251; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_11_17, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_17;)

Created:

Nov 17, 2023, 12:00 PM

Updated:

Nov 17, 2023, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Aug 18, 2025, 8:35 PM

Filename:

rules/emerging-info.rules