alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"🐾 - 🚨 APT package management 🐧 Ubuntu Linux"; flow:to_server, stateless; ja3.hash; content:"f35ce21b44ac0b87d3266294bb1b0e20"; fast_pattern; threshold:type limit, track by_src,count 1, seconds 86400; tls_sni; content:"esm.ubuntu.com"; nocase; reference:url,https://releases.ubuntu.com/; metadata:created_at 2023_07_25, updated_at 2023_07_25; sid:3300165; rev:1; classtype:policy-violation;)