Remediation and Hardening Strategies for Microsoft 365 to Defend Against UNC2452


In December 2020, FireEye uncovered and publicly disclosed a widespread attacker campaign that is being tracked as UNC2452. In some, but not all, of the intrusions associated with this campaign where Mandiant has visibility, the attacker used their access to on-premises networks to gain unauthorized access to the victim’s Microsoft 365 environment.

Goals and Objectives

Methodologies that UNC2452 and other threat actors have used to move laterally from on-premises networks to the Microsoft 365 cloud have been detailed in our white paper, Remediation and Hardening Strategies for Microsoft 365 to Defend Against UNC2452. The paper also discusses how organizations can proactively harden their environments and remediate environments where similar techniques have been observed.

Mandiant is releasing an auditing script, Azure AD Investigator, through its GitHub repository that organizations can use to check their Microsoft 365 tenants for indicators of some of the techniques used by UNC2452.

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Source: FireEye