To identify potential data exfiltration attempts during a security incident investigation, which filter should be applied in the Microsoft Defender XDR portal?

Applying the data sensitivity filter in the Microsoft Defender XDR portal is crucial for identifying potential data exfiltration attempts during a security incident investigation. This filter allows security analysts to focus specifically on data that has been classified based on its sensitivity level, enabling them to prioritize their investigation on more critical or confidential information that may be targeted by malicious actors for exfiltration.

Data sensitivity is often linked to the regulatory requirements and organizational policies, so identifying activities around sensitive data can provide insights into vulnerabilities or breaches that may warrant immediate attention. By filtering for data sensitivity, analysts can effectively monitor and respond to potential threats and breaches that pose a risk to the most valuable data within an organization.

The other filters, while they may provide useful information, do not specifically target data exfiltration attempts in the same way. For example, multiple category and incident assignment filters may help in organizing incidents but won't directly highlight the sensitive data at risk. The associated threat filter can identify known threats but does not prioritize based on the sensitivity of the data involved. Hence, focusing on data sensitivity is the most effective approach for this specific scenario.