MFA Reset & Validation

1. Prerequisites

• Identity provider logs
• MFA telemetry
• Device registration logs
• User account information
• Authentication timeline
• Access to identity provider
• Access to MFA platform
• Access to SIEM
• Access to mobile device management platform

2. Step-by-Step Instructions

Common Failure Modes

• Leaving trusted devices intact
• Ignoring backup recovery methods
• Re-enrolling MFA without identity verification

1. Review Existing MFA Configuration

   • Identify:
     • Registered MFA methods
     • Trusted devices
     • Recovery methods
     • Push notification approvals
     • Hardware token assignments

2. Identify Suspicious MFA Activity

   • Review:
     • MFA fatigue attempts
     • Unexpected approvals
     • Rogue device registrations
     • Suspicious enrollment events
     • Bypass activity

3. Remove Existing MFA Enrollments

   • Reset:
     • Push-based MFA
     • TOTP applications
     • SMS-based MFA
     • Hardware token associations
     • Backup/recovery methods

4. Validate Trusted Devices

   • Review:
     • Device ownership
     • Device health
     • Device compliance status
     • Device registration timestamps

   Remove: - Unknown devices - Non-compliant devices - Suspicious device enrollments

5. Re-Enroll MFA Securely

   • Require:
     • Fresh MFA registration
     • Verified user identity
     • Approved authentication methods
     • Device compliance validation

6. Validate Authentication Integrity

   • Confirm:
     • MFA functioning correctly
     • No rogue devices remain
     • No persistent approvals exist
     • Authentication challenges enforced

3. Post-Action

• Document all containment steps taken in the incident ticket, along with the time each action was taken

Contributor

Vishal Thakur
GitHub: https://github.com/malienist

Jayden Vo GitHub: https://github.com/jayden-vo

Contributed to the Arcana Incident Response Documentation Framework.