alert tcp $HOME_NET any -> $EXTERNAL_NET !3389 (msg:"ET POLICY Remote Desktop Connection via non RDP Port"; flow:established,to_server; content:"|03|"; depth:1; content:"|e0|"; distance:4; within:1; content:"Cookie|3a|"; distance:5; within:7; classtype:policy-violation; sid:2007571; rev:6; metadata:created_at 2010_07_30, signature_severity Unknown, updated_at 2019_07_26;)