VNC Remote Desktop Access Attempt Detected
This rule detects attempts to establish a VNC (Virtual Network Computing) remote desktop session to a host on the protected network. It specifically looks for TCP traffic destined for port 5900 (the default VNC port) and the presence of the 'RFB 00' string within the initial bytes of the connection, which is characteristic of the VNC RFB (Remote Framebuffer) protocol handshake.
Suricata
