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Detection Decay
The gradual loss of a detection's effectiveness over time, as environments change, attackers adapt, log sources shift, or allowlists accumulate, so a rule that once worked quietly stops catching what it should.
Detections are not write-once: the environment evolves, software changes log formats, attackers learn to evade, and tuning exceptions pile up, all of which erode a detection's effectiveness, often silently. Detection decay is the recognition that detections must be monitored, periodically revalidated, and maintained, not just deployed and forgotten. Managing decay through testing and review is essential to keeping coverage real rather than theoretical.
Introduced in: Detection Engineering
Examples
- A detection silently failing after a software update changed its log format.
- Accumulated allowlist entries narrowing a detection until it misses threats.
- Revalidating detections periodically to catch ones that have decayed.
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