alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"🐾 - ℹ Tchap 💬 🇫🇷 national IM"; flow:to_server, stateless; threshold:type limit, track by_src,count 1, seconds 86400; tls_sni; content:"matrix.agent.externe.tchap.gouv.fr"; nocase; reference:url,https://www.tchap.gouv.fr/; metadata:created_at 2022_03_18, updated_at 2022_06_15; sid:3300797; rev:3; classtype:misc-activity;)