ET PHISHING Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing - Suricata Rule 2024227 (et/open)

ET PHISHING Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing

SID: 2024227Rev: 412 viewsHistory

Sourceet/open

CreatedApril 19, 2017

UpdatedAugust 20, 2020

Classificationpolicy-violation

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing"; flow:established,from_server; tls.cert_subject; content:"xn--"; tls.cert_issuer; content:"O=Let's Encrypt"; reference:url,isc.sans.edu/forums/diary/Tool+to+Detect+Active+Phishing+Attacks+Using+Unicode+LookAlike+Domains/22310/; reference:url,letsencrypt.org/about/; classtype:policy-violation; sid:2024227; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_08_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)

References

url	isc.sans.edu/forums/diary/Tool+to+Detect+Active+Phishing+Attacks+Using+Unicode+LookAlike+Domains/22310/
url	letsencrypt.org/about/

Metadata

affected productWeb_Browsers

attack targetClient_Endpoint

created at2017_04_19

deploymentPerimeter

confidenceMedium

signature severityCritical

tagPhishing

updated at2020_08_20

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1566

mitre technique namePhishing

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