For Internal Hostile Unstructured (IHU) threat we have a term and definition in Computer Virus.

An individual within an organization who has physical access to network components. This individual is motivated to disrupt the operations of the organization but lacks the resources, tools, or skills necessary to launch a sophisticated attack. It would not be unusual for this threat to attack the organization by deploying a common virus. Unskilled, disgruntled employees or users who could benefit from disrupting operations often fall into the IHU threat category.
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