Rule History

SID: 2029704 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 2 • Mar 23, 2020, 12:00 PM

Message:

ET HUNTING Observed Lets Encrypt Certificate - Possible COVID-19 Related M2

Rule:

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Observed Lets Encrypt Certificate - Possible COVID-19 Related M2"; flow:established,to_client; tls.cert_subject; content:"corona"; nocase; fast_pattern; tls.cert_issuer; content:"Lets Encrypt"; classtype:bad-unknown; sid:2029704; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_03_23, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_23;)

Created:

Mar 23, 2020, 12:00 PM

Updated:

Mar 23, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 19, 2025, 10:35 PM

Filename:

rules/emerging-hunting.rules