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MediumSplunk security contentRod Soto +1

O365 PST export alert

The following analytic detects instances where a user has initiated an eDiscovery search or exported a PST file in an Office 365 environment. It leverages Office 365 management activity logs, specifically filtering…

Description

The following analytic detects instances where a user has initiated an eDiscovery search or exported a PST file in an Office 365 environment. It leverages Office 365 management activity logs, specifically filtering for events under ThreatManagement with the name "eDiscovery search started or exported." This activity is significant as it may indicate data exfiltration attempts or unauthorized access to sensitive information. If confirmed malicious, it suggests an attacker or insider threat is attempting to gather or exfiltrate data, potentially leading to data breaches, loss of intellectual property, or unauthorized access to confidential communications. Immediate investigation is required.

Detection logic

Detection requirements

Platform
LinuxmacOSOffice SuiteWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
o365

Known benign triggers

  • PST export can be done for legitimate purposes but due to the sensitive nature of its content it must be monitored.

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