alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Free File Hosting Domain (sendbig .com) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".sendbig.com"; endswith; fast_pattern; classtype:misc-activity; sid:2044721; rev:2; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2023_03_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_05_09;)