Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Lets Encrypt Free SSL Cert Observed in Tech Support Scams M6"; flow:established,to_client; tls.cert_subject; content:"O=Let|27|s Encrypt"; content:"CN=check-work-18799.top"; fast_pattern; reference:url,blog.sucuri.net/2017/02/javascript-injections-leads-to-tech-support-scam.html; reference:url,letsencrypt.org/about/; classtype:social-engineering; sid:2024129; rev:5; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_03_31, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2024_04_23;)