cd "C:\Program Files\Oracle\VirtualBox\" VBoxManage modifyvm "Your VM Name" --cpuidset 00000001 000106e5 00100800 0054322b 7edbefbf VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac11,3" VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0" VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple" VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc" VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1 Use code with caution.
This is the core technical process. It requires a Mac with a working copy of the Install macOS High Sierra.app in the /Applications folder. macos high sierra 10.13.5.iso
Third-party tech forums sometimes offer pre-made ISO images, but these should be verified for authenticity to avoid malware. Creating a Bootable Installer on macOS macos high sierra 10.13.5.iso