Windows Necessary Firewall is a fake security application from from the same
family as:
Windows Custom Settings,
Windows Risks Preventions,
Windows Firewall Unit,
Windows Profile System,
Windows Precautions Center,
Windows Safeguard Utility,
Windows Repairing System,
Windows Activity Inspector,
Windows Protection Servant,
Windows Activity Inspector,
Windows Tweaking Utility, Windows Tasks Optimizer, Windows Work Catalyst ,
Windows Attention Utility,
Windows Inspection Utility,
Windows Supervision Center,
Windows Oversight Center. This rogue displays fake warning messages pushing users to buy a license.
If your PC is infected with
Windows Necessary Firewall use
MBAM to remove the infection.