alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed TonAPI Domain in TLS SNI (tonapi .io)"; flow:established,to_server; tls.sni; bsize:9; content:"tonapi.io"; fast_pattern; classtype:misc-activity; sid:2071845; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_08_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag TonAPI, tag Blockchain, updated_at 2026_08_28;)