alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Telegram Domain (t .me in TLS SNI)"; flow:established,to_server; tls.sni; bsize:4; content:"t.me"; fast_pattern; classtype:misc-activity; sid:2041933; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_06_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_26, former_sid 2851827;)