Based on analyses of similar tools, here is a summary of the features you could expect to find in such a piece of software:
Some variants of these legacy scanners not only check if the port is open but also attempt to detect if the VNC server requires authentication or is misconfigured with a "null authentication" bypass. The Dual-Use Nature of VNC Scanners Vnc Scanner Gui V1.2
VNC Scanner GUI V1.2 is often associated with older network security testing and "gray hat" tools. Malware Risk Based on analyses of similar tools, here is