alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY My2022/Beijing2022 App (TLS SNI) 1"; flow:established,to_server; tls_sni; content:"bigdata.beijing2022.cn"; isdataat:!1,relative; nocase; reference:url,citizenlab.ca/2022/01/cross-country-exposure-analysis-my2022-olympics-app/; classtype:policy-violation; sid:2034995; rev:2; metadata:created_at 2022_01_28, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_28;)