11. What caused the decrease in threat incidents you observed?
Discuss whether it came from improved detection based on your reverse-engineering work or from another factor.
Use STAR to structure your answer: briefly explain the Situation and Task, make Action the most detailed part, and finish with the Result. For example, describe Discuss whether it came from improved detection based on your reverse-engineering work or from another factor.
In my last role, we were seeing repeated endpoint threat incidents that looked different at first but shared similar behavior. I had been reverse engineering several suspicious samples to understand how they executed, established persistence, and communicated with external systems.
My responsibility was to determine why the incidents were recurring and help reduce them. I also needed to separate two effects clearly. Better detection could make us find more incidents, while stronger prevention could actually reduce how often the threat succeeded.
I compared what I learned from reverse engineering with our endpoint alerts and investigation notes. I found common behaviors across the samples, including similar execution patterns, persistence methods, and network activity. I turned those behaviors into detection logic so we could identify related activity even when file names or other simple indicators changed. I then shared the findings with the teams responsible for endpoint and security controls. We used the same behavior information to strengthen preventive controls and remove conditions that allowed the activity to succeed. I continued reviewing alerts after the changes so I could tell whether we were simply detecting threats differently or actually seeing fewer successful incidents. The important point was that reverse engineering improved our understanding first. That understanding supported both better detection and better prevention.
The decrease came mainly from the preventive changes that were based on what the reverse engineering revealed, rather than from detection alone. Detection gave us better visibility and confidence that related activity was not simply being missed. Over time, we saw fewer successful incidents matching the behavior we had studied. I learned that when incident numbers fall, I should verify whether the cause is stronger prevention, a detection change, or a change in attacker activity before claiming success.
Interviewers ask this to see whether the candidate can distinguish a real reduction in successful threats from a change in security visibility. A strong answer shows careful analysis, technical judgment, and an ability to connect reverse engineering findings to both detection and prevention.