M365 Security Auditing and Reporting with PowerShell

Security auditing in M365 relies on the Unified Audit Log, which can be queried effectively using the Search-UnifiedAuditLog PowerShell cmdlet to investigate suspicious activities. Preparing for security incident scenarios on the MS-102 exam is highly effective when leveraging practice environments and tools like Cert Sensei.

The Unified Audit Log

The Unified Audit Log (UAL) is the central repository for user and administrator activities across M365 workloads.

Ensuring auditing is enabled is the crucial first step for any security baseline.

Using Search-UnifiedAuditLog

The `Search-UnifiedAuditLog` cmdlet is the primary tool for extracting security events programmatically.

Admins can filter by date, specific user, or record type to track down unauthorized file access or login failures.

Exporting Reports for Analysis

Audit data is vast and often needs to be parsed in external tools like Excel or a SIEM system.

PowerShell seamlessly pipes audit results to CSV files, making data manipulation and long-term retention simple.

Automating Security Alerts

Beyond manual searches, admins can script scheduled tasks to monitor for specific high-risk actions.

These scripts can trigger email alerts if actions like mass file deletions or external forwarding rules are detected.

❓ Frequently Asked Questions