Steven Sprague
Monday, April 23, 2012

When the Stuxnet virus caused centrifuges to malfunction at Iran’s Bushehr nuclear reprocessing facility last year, it put cyber security officials around the world on notice that a new, more dangerous strain of Advanced Persistent Threat (APT) had appeared.

Post-analysis indicated the Stuxnet virus had altered the basic-input-output system (BIOS) firmware of the facility’s computer control systems. In essence, it targeted the computers’ pre-boot environments, which made it invisible to all software layers that subsequently came online.