Why has eSentire's Managed Detection and Response service seen a 15% drop in threat detections over the past month?

Introduction

The recent 15% drop in threat detections for eSentire's Managed Detection and Response (MDR) service over the past month is a critical issue that demands immediate attention and thorough analysis. As we delve into this problem, we'll employ a systematic approach to identify, validate, and address the root cause while considering both short-term and long-term implications for the service and its users.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking there might be a seasonal component. Has this drop coincided with any particular time of year or event?

Why it matters: Seasonal patterns could explain temporary fluctuations in threat detection. Expected answer: No significant seasonal correlation observed. Impact on approach: If seasonal, we'd focus on adjusting baseline expectations; if not, we'd investigate other factors.

• Considering the metric itself, I'm curious about the definition of "threat detections." Has there been any recent change in how threats are classified or counted?

Why it matters: Changes in measurement can significantly impact metrics without actual performance changes. Expected answer: No recent changes to threat classification or counting methods. Impact on approach: If changed, we'd need to recalibrate our analysis based on the new definition; if not, we'll focus on performance factors.

• Thinking about the service components, have there been any recent updates to the MDR system, such as algorithm changes or new data sources?

Why it matters: System changes could directly affect detection capabilities. Expected answer: Minor updates were implemented, but nothing expected to cause significant changes. Impact on approach: If major changes occurred, we'd investigate their impact; if not, we'd look at other potential causes.

• Considering user behavior, has there been any shift in the types of clients using the service or changes in their security practices?

Why it matters: Changes in user base or behavior could affect the number of detectable threats. Expected answer: Client base has remained relatively stable. Impact on approach: If significant changes in clientele, we'd analyze new user profiles; if stable, we'd focus on system and environmental factors.