alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"🐾 - ℹ Synology NAS 💽"; flow:to_server, stateless; threshold:type limit, track by_src,count 1, seconds 86400; tls_sni; content:"pkgupdate.synology.com"; nocase; ja3.hash; content:"f436b9416f37d134cadd04886327d3e8"; reference:url,https://www.synology.com/; metadata:created_at 2021_09_11, updated_at 2022_06_15; sid:3300783; rev:2; classtype:misc-activity;)