ET HUNTING Observed Lets Encrypt Certificate - Possible COVID-19 Related M1
Sourceet/open
CreatedMarch 23, 2020
UpdatedMarch 23, 2020
Classificationbad-unknown
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Observed Lets Encrypt Certificate - Possible COVID-19 Related M1"; flow:established,to_client; tls.cert_subject; content:"covid"; nocase; tls.cert_issuer; content:"Lets Encrypt"; classtype:bad-unknown; sid:2029703; 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;)
Metadata
affected productWeb_Browsers
attack targetClient_Endpoint
created at2020_03_23
deploymentPerimeter
confidenceMedium
signature severityInformational
tagDescription_Generated_By_Proofpoint_Nexus
updated at2020_03_23
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