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Get Started Free →cyberstrikeus/T0821_modify-controller-tasking
Adversaries may modify the tasking of a controller to allow for the execution of their own programs.
Passed 19 of 22 test cases with the skill, and 7 of 22 without it.
and 17 more in the full report
12 fixed7 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
We are mapping our ICS threat matrix to the MITRE ATT&CK for ICS framework. Under the Execution tactic (TA0104), which specific technique addresses altering task schedules or program associations on controllers?
| Checked | Without skill | With skill |
|---|---|---|
| Names MITRE ATT&CK technique T0821 Modify Controller Tasking. | Missed | Passed |
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Adversaries may modify the tasking of a controller to allow for the execution of their own programs. This can allow an adversary to manipulate the execution flow and behavior of a controller.
According to 61131-3, the association of a Task with a Program Organization Unit (POU) defines a task association. An adversary may modify these associations or create new ones to manipulate the execution flow of a controller. Modification of controller tasking can be accomplished using a Program Download in addition to other types of program modification such as online edit and program append.
Tasks have properties, such as interval, frequency and priority to meet the requirements of program execution. Some controller vendors implement tasks with implicit, pre-defined properties whereas others allow for these properties to be formulated explicitly. An adversary may associate their program with tasks that have a higher priority or execute associated programs more frequently. For instance, to ensure cyclic execution of their program on a Siemens controller, an adversary may add their program to the task, Organization Block 1 (OB1).
Platforms: ICS
Determine if the target ICS/SCADA environment is susceptible to Modify Controller Tasking by examining operational technology systems and network architecture.
Review whether mitigations for T0821 are in place. If defenses are absent or misconfigured, this technique may be exploitable in the ICS environment.
All field controllers should restrict the modification of controller tasks to only certain users (e.g., engineers, field technician), preferably through implementing a role-based access mechanism.
test cases passed, vs 7 / 22 without
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