alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"🐾 - ℹ Lexmark Printer 🖨"; flow:to_client, established; threshold:type limit, track by_src,count 1, seconds 86400; tls.cert_subject; content:"CN=ldc.lexmark.com"; nocase; reference:url,https://www.lexmark.com/; metadata:created_at 2021_11_12, updated_at 2022_06_13; sid:3300738; rev:4; classtype:misc-activity;)