Adversaries may manipulate physical process control within the industrial environment. Methods of manipulating control can include changes to set point values, tags, or other parameters. Adversaries may manipulate control systems devices or possibly leverage their own, to communicate with and command physical control processes. The duration of manipulation may be temporary or longer sustained, depending on operator detection.
Methods of Manipulation of Control include:
A Polish student used a remote controller device to interface with the Lodz city tram system in Poland.    Using this remote, the student was able to capture and replay legitimate tram signals. As a consequence, four trams were derailed and twelve people injured due to resulting emergency stops.  The track controlling commands issued may have also resulted in tram collisions, a further risk to those on board and nearby the areas of impact. 
Stuxnet can reprogram a PLC and change critical parameters in such a way that legitimate commands can be overridden or intercepted. In addition, Stuxnet can apply inappropriate command sequences or parameters to cause damage to property. 
Protocols used for control functions should provide authenticity through MAC functions or digital signatures. If not, utilize bump-in-the-wire devices or VPNs to enforce communication authenticity between devices that are not capable of supporting this (e.g., legacy controllers, RTUs).
Take and store data backups from end user systems and critical servers. Ensure backup and storage systems are hardened and kept separate from the corporate network to prevent compromise. Maintain and exercise incident response plans , including the management of \gold-copy\ back-up images and configurations for key systems to enable quick recovery and response from adversarial activities that impact control, view, or availability.
|M0810||Out-of-Band Communications Channel||
Utilize out-of-band communication to validate the integrity of data from the primary channel.