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Azure AD New MFA Method Registered

The following analytic detects the registration of a new Multi-Factor Authentication (MFA) method for a user account in Azure Active Directory. It leverages Azure AD audit logs to identify changes in MFA…

Description

The following analytic detects the registration of a new Multi-Factor Authentication (MFA) method for a user account in Azure Active Directory. It leverages Azure AD audit logs to identify changes in MFA configurations. This activity is significant because adding a new MFA method can indicate an attacker's attempt to maintain persistence on a compromised account. If confirmed malicious, the attacker could bypass existing security measures, solidify their access, and potentially escalate privileges, access sensitive data, or make unauthorized changes. Immediate verification and remediation are required to secure the affected account.

Detection logic

Detection requirements

Platform
Identity ProviderWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Known benign triggers

  • Users may register MFA methods legitimally, investigate and filter as needed.

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