here ‘s the shape I installed :
Late 2015 Retina iMac ( credibly any modern adequate Mac will work )
— — – VirtualBox 5.2.19 ( no foreseeable reason future revolutions per minute of VirtualBox wo n’t work )
— — — — – macOS High Sierra 10.13.6 ( credibly works with several macOS release versions )

  1. First download High Sierra installer from app store. ( App storehouse app puts it into /Applications and launches it. The autorun installer can be quit so that it can be converted to an ISO )
  2. You can convert the installer DMG to an ISO, using the script at the end of this answer. Some other approaches work excessively. You may need or want to tweak the file names or the name of the OS/Installer app depending on what OS you ‘re trying to install, etc …
  3. After creating the ISO, create a virtual machine with the following shape settings :
OS Type: macOS 10.13 High Sierra (64-bit)
Base Memory: 4096 GB RAM
Disk Size: 32 GB disk size
Video RAM: 128 MB
2 CPUs
disable floppy
disable serial port
disable audio

From command line create the following VirtualBox extra data values for the VM .
NOTE : These seemed to be critical for me to get the installer to bang and run .
These extra data settings I found to be omitted from most or all of the Mac facility instructions that I found on-line. I borrowed these values from Windows VirtualBox install instructions, and modified the system product to match my iMac ‘s ( iMac17,1 ). Without these extra data settings, the installer failed mid-boot, infinitely looping with some error pertaining to trying to reboot MACH ) .

    VBoxManage setextradata  {vm name or ID} "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac17,1"
    VBoxManage setextradata  {vm name or ID} "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
    VBoxManage setextradata  {vm name or ID} "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
    VBoxManage setextradata  {vm name or ID} "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
    VBoxManage setextradata  {vm name or ID} "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1
  1. Point the VM to the ISO you created in step 2, and boot it.

When the recovery partition ‘s GUI comes up ( wherein you have the choice to reinstall ( besides used for initial install ) ), first base choose Disk Utility, and find and format ( e.g. Erase ), the virtual disk you created during the initial creation of the VirtualBox Guest VM. In Disk Utility, the difficult disk will show up as a harrow on the left. Erase/format it as Mac OS Extended Journaled .
If you do n’t inaugural explicitly format the virtual disk, the macOS installer will not find any disks to install macOS on. If you have n’t formatted the magnetic disk, the installer will not err out but will just sit there expecting you to choose a phonograph record, with none listed, and no choice to continue with the facility.

After the first boot during initiation, I got stuck at the UEFI shell prompt, which is obtuse and confusing for the uninitiate ( i.e. I did n’t know what to do about it ) .
The argue I got dumped in the UEFI boot shell is that macOS was n’t installed so far in the boot partition, and the boot stevedore does n’t automatically boot into the convalescence partition if the beginning partition is n’t valid .
To manually boot/execute code in recovery partition in order to complete the installation, do the follow ( recognition to VirtualBox forums for this information ) :

  1. At UEFI shell prompt: Type exit
  2. You’ll be brought into an EFI text-mode GUI.
  3. Select Boot Maintenance Manager and click.
  4. Select Boot From File and click

You should see a list populated with two cryptic looking entries ( PCI bus paths )
The beginning is the PCI path to a bang partition that is not valid because you have n’t installed macOS on it yet. After installing macOS the boot should find that division and boot normally, without dumping you out at the UEFI plate.

The 2nd partition is the recovery partition, the one you need to boot from to do the macOS initiation .

  • Click the 2nd entry, you should see (and then click): macOS Install Data
  • Then click: Locked Files
  • And finally click: boot.efi

At that point the installer boot will continue and you should get to the point where macOS can be installed .
Bash script to convert macOS installer app downloaded from app store to ISO

installer="/Applications/Install macOS High"    
hdiutil create -o /tmp/HighSierra.cdr -size 5500m -layout SPUD -fs HFS+J
hdiutil attach /tmp/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/install_build
sudo "$installer"/Contents/Resources/createinstallmedia --volume /Volumes/install_build
mv /tmp/HighSierra.cdr.dmg ~/Downloads/InstallSystem.dmg
hdiutil detach /Volumes/Install\ macOS\ High\ Sierra
hdiutil convert ~/Downloads/InstallSystem.dmg -format UDTO -o ~/Downloads/HighSierra.iso

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