System Shutdown/Reboot

Adversaries may shutdown/reboot systems to interrupt access to, or aid in the destruction of, those systems. Operating systems may contain commands to initiate a shutdown/reboot of a machine or network device. In some cases, these commands may also be used to initiate a shutdown/reboot of a remote computer or network device via Network Device CLI (e.g. <code>reload</code>). They may also include shutdown/reboot of a virtual machine via hypervisor / cloud consoles or command line tools. Shutting down or rebooting systems may disrupt access to computer resources for legitimate users while also impeding incident response/recovery. Adversaries may also use Windows API functions, such as `InitializeSystemShutdownExW` or `ExitWindowsEx`, to force a system to shut down or reboot. Alternatively, the `NtRaiseHardError`or `ZwRaiseHardError` Windows API functions with the `ResponseOption` parameter set to `OptionShutdownSystem` may deliver a “blue screen of death” (BSOD) to a system. In order to leverage these API functions, an adversary may need to acquire `SeShutdownPrivilege` (e.g., via Access Token Manipulation). In some cases, the system may not be able to boot again. Adversaries may attempt to shutdown/reboot a system after impacting it in other ways, such as Disk Structure Wipe or Inhibit System Recovery, to hasten the intended effects on system availability.