You're looking to create a feature for a custom operating system, specifically "HalloWeen OS" based on Windows Lite .NET.
“I use it year-round because it’s genuinely the fastest Windows 10 build I’ve tried. I just turn off the Halloween sounds after November.” – WindowsLite.Net - HalloWeen OS.iso
Run format C: in the "Ghoul Prompt" or simply wait until November 1st—the OS self-deletes and turns back into a pumpkin. You're looking to create a feature for a
.iso file with Windows Defender (offline) or VirusTotal (though this cannot catch all runtime threats).