Synopsis:
As an emerging concept, the industry has yet to settle on a definitive definition of adversarial simulation, but it involves simulating [components of] targeted attacks in order to test both an organization’s instrumentation stacks and their ability to respond to the attack via their incident response process.
This differs from Red Teaming in that adversarial simulation is typically a cooperative activity between the simulation runners and the simulation recipients with an end goal of validating defensive telemetry and testing incident response plans and playbooks. Raphael Mudge wrote a great blog post on the subject, which I recommend.
Source: https://medium.com/uber-security-privacy/uber-security-metta-open-source-a8a49613b4a
GitHub Repository: https://github.com/uber-common/metta