The Stheno Corporation are planning to cause a doomsday event using an unknown doomsday device within the next 12 hours, are you able to stop them dead in their tracks?

Your Goal

Stop the doomsday from occuring by disabling the doomsday devices created by The Stheno Corporation. Once you have succeeded you can retrieve your flag from

================ !!! IMPORTANT !!! ================

There are two vms that need to be powered on at the same time you cannot have one open while the other is offline

The vms must be on a host-only network and must be able to use the following ips (default settings for virtualbox):


Settings for virtualbox: - IPv4 Address: - IPv4 Netmask:


  • Server Addr:
  • Server Mask:
  • Lower Addr Bound:
  • Upper Addr Bound:

This must be setup as there are strict firewall rules on the vms

Do not worry if you cannot reach from the host pc this is intended