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Sensitive Data Exfiltration and the Insider

The Insider Lifecycle

Traditional security is designed to keep outsiders from getting in. What happens when the enemy is an insider? A new paradigm must be explored, where the focus needs to shift inward and how data is going outbound.

Identifying anomalies in data exfiltration is critical to how to spot the insider. The insider has a typical lifecycle:

1. Identify places where sensitive data is store
2. Retrieve the data from the location
3. Move the data within the organization to prepare for exfiltration
4. Transfer the data outside the organization

Arguably, the weak points of this chain of events occur in steps 1, 2, and 4, where the insider must go through funnel points—near the data and at a public outbound connection.

Things to Look For

In almost all cases of data theft, the insider had access to the data, but in many cases, the insider’s role would have been suspect when considering the data they were accessing. Consequently, role should be examined for the end user in the context of data they are accessing.

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