alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Telegram Domain in TLS SNI (tg-support .org)"; flow:established,to_server; tls.sni; dotprefix; content:".tg-support.org"; endswith; fast_pattern; classtype:misc-activity; sid:2071636; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_19, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Telegram, updated_at 2026_08_19;)