By Saint (www.saintlad.com) :)

You should choose which code you would be using according to your VirtualBox version. For example, if yours is VirtualBox 5.1.14 , then you would have to enter the Code for Virtualbox 5.x.x.(you can find it below)




Code for Virtualbox 5.x.x:

cd "C:\Program Files\Oracle\VirtualBox\"
VBoxManage.exe modifyvm "macOS 10.12 Sierra" --cpuidset 00000001 000106e5 00100800 0098e3fd bfebfbff
VBoxManage setextradata "macOS 10.12 Sierra" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac11,3"
VBoxManage setextradata "macOS 10.12 Sierra" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
VBoxManage setextradata "macOS 10.12 Sierra" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
VBoxManage setextradata "macOS 10.12 Sierra" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
VBoxManage setextradata "macOS 10.12 Sierra" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1





Code for Virtualbox 4.x.x:

cd "C:\Program Files\Oracle\VirtualBox\"
VBoxManage.exe modifyvm "Virtual Machine Name" --cpuidset 00000001 000306a9 04100800 7fbae3ff bfebfbff
VBoxManage setextradata "Virtual Machine Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "MacBookPro11,3"
VBoxManage setextradata "Virtual Machine Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
VBoxManage setextradata "Virtual Machine Name" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
VBoxManage setextradata "Virtual Machine Name" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
VBoxManage setextradata "Virtual Machine Name" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1