Set the network adapter to or NAT Network so your attacking machine (like Kali Linux) can communicate with it.
: If the VM doesn't show up on your network in VirtualBox, try changing the adapter type in "Advanced Settings" to PCnet-PCI II (Am79c970A) . 2. Common Methodology for Exploitation Kioptrix.ova
The general workflow for tackling a Kioptrix machine follows a standard pentesting process: Kioptrix Level 1 CTF Walkthrough - Boot-To-Root Set the network adapter to or NAT Network