alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Splashtop Domain (splashtop .eu) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".splashtop.eu"; endswith; fast_pattern; reference:url,support-splashtopbusiness.splashtop.com/hc/en-us/articles/115001811966-What-are-the-Firewall-Exceptions-and-IP-addresses-of-Splashtop-servers-Services-; classtype:misc-activity; sid:2035765; rev:1; metadata:attack_target Client_and_Server, created_at 2022_04_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_05;)