alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO 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:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, former_category PHISHING, 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;)

Added 2021-07-06 18:45:53 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO 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:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, former_category INFO, signature_severity Minor, tag Phishing, updated_at 2020_08_20;)

Added 2020-08-20 17:55:32 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO 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:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, former_category INFO, signature_severity Minor, tag Phishing, updated_at 2017_04_19;)

Added 2020-08-05 19:13:28 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing"; flow:established,from_server; content:"|55 04 0a|"; content:"|0d|Let|27|s Encrypt"; distance:1; within:14; fast_pattern; content:"|55 04 03|"; distance:0; content:"|78 6e 2d 2d|"; within:25; nocase; metadata: former_category INFO; 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:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, deployment Perimeter, tag Phishing, signature_severity Minor, created_at 2017_04_19, updated_at 2017_04_19;)

Added 2017-08-07 21:19:33 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing"; flow:established,from_server; content:"|55 04 0a|"; content:"|0d|Let|27|s Encrypt"; distance:1; within:14; fast_pattern; content:"|55 04 03|"; distance:0; content:"|78 6e 2d 2d|"; within:25; nocase; 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:2;)

Added 2017-05-05 16:59:06 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing"; flow:established,from_server; content:"|55 04 0a|"; content:"|0d|Let|27|s Encrypt"; distance:1; within:14; fast_pattern; content:"|55 04 03|"; distance:0; content:"|78 6e 2d 2d|"; within:25; nocase; metadata: former_category INFO; 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:2;)

Added 2017-05-03 17:35:59 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Lets Encrypt Free SSL Cert Observed with IDN/Punycode Domain - Possible Phishing"; flow:established,from_server; content:"|55 04 0a|"; content:"|0d|Let|27|s Encrypt"; distance:1; within:14; fast_pattern; content:"|55 04 03|"; distance:0; content:"|78 6e 2d 2d|"; within:25; nocase; 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:2;)

Added 2017-04-20 17:48:43 UTC


Topic revision: r1 - 2021-07-06 - TWikiGuest
 
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