alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Iperius Remote Domain in TLS SNI"; flow:established,to_server; tls.sni; bsize:18; content:"us-rs1.iperius.com"; fast_pattern; reference:md5,28fbfd1791dca3a37eb60d33ad00ba68; classtype:bad-unknown; sid:2044181; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_02_13, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_26, reviewed_at 2023_09_29;)