alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"🐾 - ℹ Signal Spam 🎣 📧 Plugin"; flow:to_server, stateless; threshold:type limit, track by_src,count 1, seconds 86400; tls_sni; content:"vrf01.signal-spam.fr"; nocase; reference:url,https://www.signal-spam.fr/; metadata:created_at 2022_02_14, updated_at 2022_06_15; sid:3300787; rev:2; classtype:misc-activity;)