In this page you can find some useful downloads.

Virtual machine disk images

Checksums (SHA 256) are as follows:

639c3ffa7b66edb1e9b1854c14498c70a1a0efa23503c1c9b9d3621b68d2f11f (cts-micro.vdi.7z)
13c701a3d7804b6d78383787fe709641d6d2f80e2270e871f3e5f716c6fd06d0 (cts-micro.vmdk.7z)

Both VMs are identical and based on Ubuntu 18.04 with Xfce4. They’ll expand to about 4.5GB disk image files and exect a legacy BIOS boot.

Both disk images are encrypted with a password that is provided during contests.

CTS Tools

These VMs do not come with CTS client tools, or come with a likely outdated version of them. Make sure you grab a copy of the most recent tools.


$ 7z x <image>.7z

And you will be asked for the password. Note: this is 7z not p7zip!

How to create VMs out of these disk images

Just create a “custom” VM and point VMware/VirtualBox to the existing disk. More details:

Guest additions

They have Open VM Tools (e.g., VMWare guest additions) installed, so you may want to use the VMDK with VMWware Player (or Workstation, or Fusion), unless you really want to use VirtualBox: in the latter case, you may need to remove Open VM Tools and install VirtualBox Guest Additions.


Just sudo dhclient <adapter name> (auto-completion should work).