alert tcp $EXTERNAL_NET any -> $HOME_NET 3389 (msg:"ET POLICY RDP connection request"; flow:to_server,established; content:"|03|"; offset:0; depth:1; content:"|E0|"; offset:5; depth:1; classtype:misc-activity; sid:2001329; rev:9; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)