Guardian ITDR for Microsoft 365
24x7 Identity Threat Detection and Response for Microsoft 365 accounts, mailboxes, and data.
If an attacker signs in as one of your users, they can change invoices, trick your team, and quietly steal data. Guardian ITDR for Microsoft 365 watches your identities and account activity around the clock so account takeovers are spotted and contained quickly, often before they become costly fraud or downtime.
Let our team see if your Microsoft 365 has been compromised in the last 6 months.
Why Microsoft 365 identity needs its own protection:
Identity is the new perimeter
Microsoft 365 is where money moves
Most attacks target accounts, not servers
Traditional tools do not see inside accounts
Guardian ITDR closes this gap by treating your Microsoft 365 identities as a critical security layer.
What Guardian ITDR for Microsoft 365 does
Continuous identity threat detection and response across Entra ID and Microsoft 365.
All delivered as a managed per-user monthly subscription that works with any Microsoft 365 tier.
- Entra ID sign-ins and authentication patterns
- MFA changes, password resets, and risky sign-ins
- New devices, locations, and session behavior for each user
- Exchange Online: inbox rules, forwarding, send-as and send-on-behalf abuse
- SharePoint and OneDrive: unusual file access, mass downloads, external sharing
- Core collaboration tools like Teams: suspicious access and data movement
- Business Email Compromise and payment diversion
- Attacker-in-the-middle phishing and MFA fatigue attacks
- Token theft and abuse of trusted sessions
- Malicious or risky OAuth app consents
- Alerts are reviewed by analysts, not left as tickets
- Real threats separated from noisy "maybe" alerts
- Clear decisions on which accounts are at risk and what was touched
- Revoke sessions and tokens for compromised accounts
- Remove malicious inbox rules and risky app consents
- Apply agreed protections, then guide users through a secure password reset
How the service works
1.
Assess: Microsoft 365 Identity Risk Assessment
- Review the last 6 months of your Microsoft 365 and identity activity
- Identify signs of past and current account compromise
- Provide a clear summary of what we found and recommended next steps
2.
Onboard and baseline
- Connect your Microsoft 365 tenant without needing E3, E5, or premium security add-ons
- Baseline normal user behavior and activity patterns
- Agree on response playbooks so we know when we can act automatically on your behalf
3.
Operate and improve
- Guardian ITDR monitors and responds 24x7
- Most identity attacks are contained in minutes, not hours, once detected and confirmed
- You receive incident reports and periodic reviews that highlight targeted users, common attack paths, and control gaps
Download the Guardian ITDR Guide
Outcomes for different stakeholders
- Lower risk of wire fraud, invoice tampering, and vendor impersonation
- Stronger protection for executives, finance, and high-risk roles
- Clear, business-focused explanations when incidents occur
- A stronger story for boards and insurers about how Microsoft 365 risk is managed
- Identity-first view of Microsoft 365 attacks, not just network or endpoint alerts
- Coverage that works with your existing Microsoft 365 licenses
- Tight response loop with agreed playbooks and minimal friction
- Evidence you can use to strengthen MFA, Conditional Access, and account policies
- Correlated telemetry focused on identity attacks, not every log line
- Behavior-aware detection that reduces noisy false positives
- Clear handoffs between Greenlight Cyber and your internal team, with full technical detail
How Guardian ITDR fits into your security program
Guardian ITDR is designed to complement, not replace, your existing security controls.
- Works alongside email security, endpoint protection, and network defenses
- Focuses specifically on Microsoft 365 identities and account activity
- Can be delivered as a standalone service or as a core part of a broader Guardian program
From a best practice standpoint, Guardian ITDR helps strengthen controls aligned to:
- Account and access management disciplines such as CIS Controls 5 and 6
- Identity-focused safeguards in frameworks like NIST CSF
Guardian ITDR provides practical controls, logging, and incident evidence that can support your broader compliance program.
Who it is for
Guardian ITDR for Microsoft 365 is a strong fit if you:
- Use Microsoft 365 for email and collaboration
- Have people who can move money or access sensitive information
- Want 24x7 eyes on Microsoft 365 accounts without building a SOC
- Need a simple per-user subscription that can scale from a few users to thousands
Learn the Hidden Risks inside Microsoft 365
A Practical Guide to Identity Threats and ITDR
Download PDF here
Frequently asked questions
Onboarding is typically completed in a short project that connects your tenant, sets baselines for normal behavior, and defines response playbooks. The Microsoft 365 Identity Risk Assessment can often be completed on a similar timeline.
When Guardian ITDR confirms a likely compromise, the service revokes active sessions, removes malicious inbox rules or risky app consents, and secures the account according to your agreed playbooks. Users are guided through a secure password reset so they can safely get back to work.
Yes. Guardian ITDR for Microsoft 365 can be purchased as a standalone managed service or as a core component within a broader, customized Guardian program from Greenlight Cyber.