alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Public Cloud Domain (cld .pt in TLS SNI)"; flow:established,to_server; tls.sni; content:"cld.pt"; bsize:6; fast_pattern; classtype:bad-unknown; sid:2035514; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_17;)