1. Mac Os El Capitan Virtualbox

One well known issue of running a guest MacOS X under VirtualBox is that it'snot possible to enter Recovery OS by pressing the Command+R key combination onVM startup. In fact after reading some bug reports on VirtualBox bugtracker itseems that it's not possible to enter Recovery OS at all.

Fortunately, we don't even need Recovery OS to disable System IntegrityProtection. We can use the Installer environment to run csrutil tool. SIP'sconfiguration is stored inside NVRAM, so it actually doesn't matter whatapproach we will take, as long as we will put some magic values into magicvariables inside NVRAM. Please be advised that while this method works, it willwork until the shutdown of your VM. You can do soft restarts, but if you'll shutdown the VM and boot it up again, you will need to disable SIP again.

In order to access Installation environment under VirtualBox, you will need toenter the VirtualBox EFI BIOS by pressing F12 few times, at very early stage ofguest VM boot up.

1. Open virtualbox and click ‘New’ to create a new virtual machine with the following details: Name: El Capitan Type: Mac OS X Version: Mac OS X 10.11 El Capitan (64 bit) Click next, select 4GB of RAM, and next again. Select the El Capitan image that you have downloaded and unzipped as the disk image, and create the machine.
2. Installing macOS as a VM in VirtualBox. These instructions will guide you through the process of creating and using bootable media to install macOS in a VirtualBox VM. Installer for for macOS (El Capitan, Sierra, High Sierra, etc.) VirtualBox 5.0+ (may work with older versions, but not tested).
3. Mac OS El Capitan in Mac. Mac is the shot Medium Access Control or Mac know as a Mac Address. It was known as a Physical address and Hardware Address because Mac is consists of a powerful security system that knows one can access the system of Mac.
4. Mac OS X build instructions Prerequisites on Mac OS X. 10.10.x (Yosemite) or later running on Intel hardware (PowerPC hardware is not supported nor is building an X11 variant).

You will be greeted with an old school text mode BIOS interface, in which youshould choose the Boot Manager option.

Inside, launch EFI Internal Shell to enter EFI commandline mode.

To install VirtualBox, just click on the setup then hit next and next. Finally, click “Finished”. Create New Virtual Machine. Now, you have to create a new Virtual Machine. Open the VirtualBox then tap on “ New ” at the upper left-hand side and name the Virtual Machine “ OS X El Capitan “.

After getting the command prompt, switch to the FS2: drive:

Of course, your drive number can be different, depending on the partition tablestructure you've chosen to have.

On the FS2: drive, in com.apple.recovery.boot directory, there is a EFIprogram inside the boot.efi file. We need to launch it.

Any errors that start with ERROR!!! can be safely ignored! :)

The Installation Environment should now start booting up, this can take severalminutes to complete.

When it will load, you need to launch the terminal, from which you will be ableto use the csrutil command:

Mac Os El Capitan Virtualbox

I've uploaded a video that walks through these steps, so if you'll have anyproblems in understanding anything, you can watch it, maybe it'll help.