Validate EDR Coverage with a Purple Team
Endpoint protection should be assessed through coverage, telemetry and response rather than product presence alone.
Define the exercise
Agree on systems, identities, allowed actions and emergency contacts. Prefer a controlled test host before widening an exercise. Describe the expected defender observation and the criteria for ending the test so that results remain understandable to both teams.
Confirm coverage
Check whether the agent is installed, healthy and reporting recently. Compare the endpoint inventory with the management console. Distinguish a missing agent from a sensor that is present but not receiving the required policy or cannot communicate with its service.
Measure the response
Use a documented, authorized simulation with predictable artifacts. Track whether the behavior is logged, whether an alert is created and whether an analyst investigates it. An absent alert does not necessarily mean absent telemetry; these are separate outcomes and require different corrections.
Improve and retest
Connect any gap to a policy, rule, workflow or inventory issue. Retest the same behavior after correction and note environment changes that may affect comparison. Avoid general claims about evasion resistance based on one exercise. Preserve an exercise timeline and lessons for the next validation cycle.
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