AN0549: Analytic 0549
Detects MFA bypass attempts by modifying tenant-wide authentication policies or excluding high-value accounts from MFA enforcement.
Analyst context for executives and security teams
This analytic matters because tenant-wide MFA policy changes or exclusions for high-value accounts can quietly weaken one of the organization’s most important identity controls. For executives and security leaders, the decision value is not just whether MFA exists, but whether changes to MFA enforcement are governed, visible to the SOC, and reviewable during an incident or audit.
Executive priority
Prioritize assurance around identity control governance for Office Suite environments: who can change tenant authentication policy, how exceptions for privileged or high-value accounts are approved, and whether the organization can produce evidence of those changes quickly. This is especially important for business continuity and incident response because unauthorized or poorly governed MFA exclusions can reduce confidence in account security and complicate containment decisions.
Technical view
SOC and identity teams should validate monitoring for administrative changes to tenant-wide authentication policies and MFA enforcement exclusions, especially where high-value accounts are affected. Because the ATT&CK object provides no detection logic, teams should map the analytic intent to their Office Suite identity and audit data sources, define what constitutes a high-value account locally, and confirm that policy-change events are retained, normalized, and triaged with appropriate context.
Likely telemetry
- Office Suite tenant audit logs
- Identity and access management administrative activity logs
- Authentication policy change records
- MFA enforcement and conditional access policy change events
- Account or group membership changes affecting high-value accounts
Detection direction
- Validate alerts for tenant-wide authentication policy modifications, not only individual sign-in failures or MFA prompts.
- Monitor exclusions from MFA enforcement for privileged, executive, service, break-glass, or otherwise high-value accounts as defined by the organization.
- Correlate policy changes with the actor, affected account or group, approval/change ticket where available, and timing relative to other identity events.
- Tune expected administrative maintenance separately from unusual or unapproved changes to reduce false positives.
- Check for blind spots where Office Suite audit logging, retention, or SIEM ingestion does not capture policy object changes or exception updates.
Mitigation priorities
- Restrict who can modify tenant authentication and MFA enforcement policies.
- Require formal approval and periodic review for MFA exclusions, especially for high-value accounts.
- Maintain an inventory of high-value accounts and groups so monitoring can identify material exclusions.
- Ensure audit logging and retention support investigation and compliance evidence for authentication policy changes.
- Test incident response procedures for suspected unauthorized MFA policy modification or exclusion activity.
Analyst notes and limits
This take is based on an ATT&CK detection analytic, AN0549, for Office Suite environments. The supplied object states the analytic intent but does not provide detection logic, tactics, relationships, procedures, or mitigations. Local identity architecture, account tiering, logging configuration, and change-management evidence are required to operationalize it.
No official detection content, relationship context, tactics, or related techniques were supplied. The guidance therefore remains control- and telemetry-oriented and should not be interpreted as a complete detection rule or evidence of active exploitation.
Analytic 0549
Detects MFA bypass attempts by modifying tenant-wide authentication policies or excluding high-value accounts from MFA enforcement.
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
All related ATT&CK context
No relationships are available in the current normalized data for this object.
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .
Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | 55d223dde1c5… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
mitre-attack AN0549Open source URL
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