[KillDisk](https://attack.mitre.org/software/S0607) is a disk-wiping tool designed to overwrite files with random data to render the OS unbootable. It was first observed as a component of [BlackEnergy](https://attack.mitre.org/software/S0089) malware during cyber attacks against Ukraine in 2015. [KillDisk](https://attack.mitre.org/software/S0607) has since evolved into stand-alone malware used by a variety of threat actors against additional targets in Europe and Latin America; in 2016 a ransomware component was also incorporated into some [KillDisk](https://attack.mitre.org/software/S0607) variants.(Citation: KillDisk Ransomware)(Citation: ESEST Black Energy Jan 2016)(Citation: Trend Micro KillDisk 1)(Citation: Trend Micro KillDisk 2)