alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Abused File Sharing Domain (put .io) in TLS SNI"; flow:established,to_server; tls.sni; bsize:6; content:"put.io"; fast_pattern; classtype:misc-activity; sid:2046654; rev:1; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2023_06_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_06_26;)