Insider Risk Baseline

Microsoft Purview Insider Risk Management (Baseline)

Insider Risk Management (IRM) uses signals across Microsoft 365 and connected sources to detect, investigate, and act on risky insider activity - data theft, leaks, and policy violations - with privacy-by-design controls (pseudonymisation, RBAC, separation of duties).

When to use

Standing up an insider-risk program: departing-employee data theft, sensitive-data leaks, and security-policy violations - with legal/HR/privacy sponsorship in place.

Do not use this skill for risk-adaptive DLP design after IRM is running (use purview-advanced-dlp) or for general communication compliance (use purview-communication-compliance if available).

Pick the right starting policy template

Rule of thumb: pick one template per quarter, tune it to acceptable signal-to-noise, then add the next. Multiple templates active simultaneously without tuning swamps reviewers.

Approach

1. Engage stakeholders - Bring legal, HR, privacy, and (where applicable) works councils to the design table; document the lawful basis for monitoring. Verify: signed-off scope document specifying data sources, retention, reviewer roles. 2. Configure prerequisites - Set IRM settings, enable required indicators (Office, device, physical badging via connectors), and connect HR data via the Microsoft 365 HR connector for events like resignation/termination. Verify: HR connector status is healthy and a test resignation event appears within 24 hours. 3. Choose policy templates - Start with templates: data theft by departing users, data leaks, security policy violations, and risky AI usage; configure scope. Verify: policy is in place with a defined user scope (pilot first) and indicator set. 4. Privacy by design - Enable pseudonymisation of usernames, scope analyst/reviewer roles tightly (RBAC, separation of duties), and configure anonymisation per legal/works-council needs. Verify: reviewers see pseudonymised identifiers by default; un-anonymise requires elevated role. 5. Triage & investigate - Review alerts, build cases, examine the user activity timeline, and escalate (e.g., to eDiscovery / HR) per the documented workflow. Verify: case management workflow exists with stages, owners, SLAs. 6. Tune indicators and thresholds - Adjust thresholds to acceptable signal-to-noise; document tuning decisions for audit. Verify: alert volume per reviewer per week within the agreed range. 7. Adaptive Protection - Feed IRM risk levels into Adaptive Protection so DLP/Conditional Access tighten dynamically for elevated-risk users. Verify: an elevated-risk test user triggers the stricter DLP branch.

Guardrails

• Engage legal/HR/privacy stakeholders before deployment; insider risk monitoring is sensitive

and getting governance wrong damages employee trust and creates legal risk.

• Use pseudonymisation and least-privilege reviewers by default; separate IRM analyst from

investigator roles.

• Tune indicator thresholds to avoid alert overload; start with a focused scope (one BU or

priority-user group) before tenant-wide.

• HR connector is mandatory for departing-user detection - resignation/termination events drive

the highest-confidence signal; without it the template is half-blind.

• Document retention for IRM signals/cases per legal/regulatory requirements; do not retain

longer than justified.

Common anti-patterns

• Switching on every template tenant-wide on day one - reviewer fatigue within a week.
• No HR connector - departing-user template fires on weak signal and misses real cases.
• Pseudonymisation off because "we trust our analysts" - works council and legal disagree later.
• Single role group with full IRM permissions - no separation of duties.
• No defined escalation path to HR/legal - cases die in the queue.

Example prompts

• Stand up an Insider Risk Management policy for departing-employee data theft.
• How do I configure pseudonymisation and least-privilege reviewers in IRM?
• Connect HR data so resignation/termination events trigger IRM signals.
• Feed IRM risk levels into Adaptive Protection.
• Tune IRM indicator thresholds to reduce alert overload.

Microsoft Learn

• IRM overview: https://learn.microsoft.com/purview/insider-risk-management
• Plan & configure IRM: https://learn.microsoft.com/purview/insider-risk-management-configure
• Policy templates: https://learn.microsoft.com/purview/insider-risk-management-policies
• Adaptive Protection: https://learn.microsoft.com/purview/insider-risk-management-adaptive-protection
• HR connector: https://learn.microsoft.com/purview/import-hr-data
• Permissions & role groups: https://learn.microsoft.com/purview/insider-risk-management-permissions