Since VMCloak 0.3 it no longer uses configuration files for simply creating VMs. However, a couple of things remain necessary to be performed before invoking VMCloak.
Mounting the ISO Image¶
In order to mount a Windows Installer ISO image a directory should be created with root, and then the image should be mounted on that directory, with root as well. The following bash snippet depicts how to setup an ISO mount on a Ubuntu/Debian system.
mkdir /mnt/winxp mount -o loop,ro winxp.iso /mnt/winxp
In order to mount an image under BSD the following commands might be required.
mkdir /mnt/winxp vnconfig /dev/vnd0d winxp.iso mount -t cd9660 /dev/vnd0d /mnt/winxp
--serial-key specifies the serial key to be used to install Windows in
the Virtual Machine. Although it is possible to randomize the serial key after
the installation has been finished, a valid serial key is required during
installation, and often times there is no one serial key to rule them all,
thus make sure to have a valid serial key at hand.
The Virtual Machine name represents the unique identifier for this VM. This
value is the extra argument on the command line, e.g.,
vmcloak -s conf.ini cuckoo1.
Guest hostonly IP address¶
The IP address to assign to the Guest is set by
--hostonly-ip. It defaults
192.168.56.101, which is perfectly fine when one only intends to
create one VM. However, if one wants to create multiple VMs, then the static
IP addresses should be unique. Normally one would start counting at
Guest hostonly Gateway¶
The Gateway IP for the Guest to use. Set by
Guest hostonly network mask¶
The Network mask for the Guest to use. Set by
Guest hostonly MAC address¶
The MAC address for the guest to use. Set by
The IP address of the vboxnet interface for communication between guest and host.
The communication is relevant for the installation process to finish.
Suggested configuration entries¶
Following are various configuration entries that are not necessary, but allow one to do some custom modifications on the guest VM, which can be quite useful if one needs to make a special VM for a custom analysis.
--ramsize one can specify the required RAM size of the VM in
megabytes. By default this value will be set to 1024 (which results to
1 GB of RAM).
--resolution sets the resolution of the VM. By default the resolution
will be set to 1024x768, a not too uncommon resolution if your PC was
bought in the year 2006.
--hdsize allows one to specify the harddrive size of the VM in megabytes.
As the created harddrive is enlarged in size on-demand, rather than allocating
all of the specified space at once, it doesn’t really matter whether one puts
32 GB or 256 GB. By default this value is set to 256 GB, but this does mean
that if at some point a VM really needs the 256 GB that the harddrive
shouldn’t run out of space.
If one hasn’t enabled VT-x in the BIOS then it is not possible to use
hardware virtualization. If one gets such error, then provide
To explicitly enable hardware virtualization provide
--hwvirt. In the config
file disable it with
hwvirt = false.
By default the
--keyboard-layout defaults to US. See
Keyboard Layout possibilities for a list of all available keyboard layouts.
In order to add a created VM automatically to Cuckoo Sandbox one must run a
recent version of Cuckoo Sandbox (1.2-dev or higher) which ships the
./utils/machine.py utility script. The
--cuckoo argument accepts a
path to the root of your Cuckoo Sandbox setup to interact with Cuckoo Sandbox.
No Register Cuckoo¶
--cuckoo argument is not provided, or it is provided but the
created VM should not be registered with Cuckoo Sandbox, then the
--no-register-cuckoo argument allows one to do that.
By default the generated Virtual Machine will use Google’s 220.127.116.11 DNS Server.
This can be changed through
Visible VM Generation¶
--vm-visible argument, if specified, runs the Virtual Machine in
GUI mode instead of headless mode (terms as per VirtualBox.) This
allows one to monitor the installation as it goes.
Often times the installation will hang at the serial key dialog. This is the case when the conf-serial-key provided is incorrect. At this point VMCloak is unable to detect it when this happens.