Adversaries may cause a denial of view in attempt to disrupt and prevent operator oversight on the status of an ICS environment. This may manifest itself as a temporary communication failure between a device and its control source, where the interface recovers and becomes available once the interference ceases. (Citation: Corero) (Citation: Michael J. Assante and Robert M. Lee) (Citation: Tyson Macaulay) An adversary may attempt to deny operator visibility by preventing them from receiving status and reporting messages. Denying this view may temporarily block and prevent operators from noticing a change in state or anomalous behavior. The environment's data and processes may still be operational, but functioning in an unintended or adversarial manner.
Have alternative methods to support communication requirements during communication failures and data integrity attacks. (Citation: National Institute of Standards and Technology April 2013) (Citation: Defense Advanced Research Projects Agency)
M0953Data BackupTake 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 (Citation: Department of Homeland Security October 2009), 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.
M0811Redundancy of ServiceRedundancy could be provided for both critical ICS devices and services, such as back-up devices or hot-standbys.
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