The adversary is trying to manipulate, disable, or damage physical control processes.
Impair Process Control consists of techniques that adversaries use to disrupt control logic and cause determinantal effects to processes being controlled in the target environment. Targets of interest may include active procedures or parameters that manipulate the physical environment. These techniques can also include prevention or manipulation of reporting elements and control logic. If an adversary has modified process functionality, then they may also obfuscate the results, which are often self-revealing in their impact on the outcome of a product or the environment. The direct physical control these techniques exert may also threaten the safety of operators and downstream users, which can prompt response mechanisms. Adversaries may follow up with or use Inhibit Response Function techniques in tandem, to assist with the successful abuse of control processes to result in Impact.
|T0806||Brute Force I/O||Adversaries may repetitively or successively change I/O point values to perform an action. Brute Force I/O may be achieved by changing either a range of I/O point values or a single point value repeatedly to manipulate a process function. The adversarys goal and the information they have about the target environment will influence which of the options they choose. In the case of brute forcing a range of point values, the adversary may be able to achieve an impact without targeting a specific point. In the case where a single point is targeted, the adversary may be able to generate instability on the process function associated with that particular point.|
|T0836||Modify Parameter||Adversaries may modify parameters used to instruct industrial control system devices. These devices operate via programs that dictate how and when to perform actions based on such parameters. Such parameters can determine the extent to which an action is performed and may specify additional options. For example, a program on a control system device dictating motor processes may take a parameter defining the total number of seconds to run that motor.|
|T0839||Module Firmware||Adversaries may install malicious or vulnerable firmware onto modular hardware devices. Control system devices often contain modular hardware devices. These devices may have their own set of firmware that is separate from the firmware of the main control system equipment.|
|T0856||Spoof Reporting Message||Adversaries may spoof reporting messages in control system environments for evasion and to impair process control. In control systems, reporting messages contain telemetry data (e.g., I/O values) pertaining to the current state of equipment and the industrial process. Reporting messages are important for monitoring the normal operation of a system or identifying important events such as deviations from expected values.|
|T0855||Unauthorized Command Message||Adversaries may send unauthorized command messages to instruct control system assets to perform actions outside of their intended functionality, or without the logical preconditions to trigger their expected function. Command messages are used in ICS networks to give direct instructions to control systems devices. If an adversary can send an unauthorized command message to a control system, then it can instruct the control systems device to perform an action outside the normal bounds of the device's actions. An adversary could potentially instruct a control systems device to perform an action that will cause an Impact.|