Rule History

SID: 2031227 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 1 • Nov 23, 2020, 12:00 PM

Message:

ET INFO Observed ZeroSSL Certificate for Suspicious TLD (.cf)

Rule:

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Observed ZeroSSL Certificate for Suspicious TLD (.cf)"; flow:from_server,established; tls.cert_subject; content:".cf"; endswith; tls.cert_issuer; content:"ZeroSSL"; classtype:bad-unknown; sid:2031227; rev:1; metadata:created_at 2020_11_23, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_23;)

Created:

Nov 23, 2020, 12:00 PM

Updated:

Nov 23, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 15, 2025, 9:36 PM

Filename:

rules/emerging-info.rules