ConnectWise Suspends Cloud Backup After Attackers Compromise Microsoft 365 Tenants

ConnectWise disabled seven of its application identities after discovering that threat actors had gained unauthorized access to them, enabling compromise of Microsoft 365 tenants. The attackers abused stolen application credentials to authenticate as legitimate ConnectWise applications and obtain access tokens via Microsoft Entra ID, potentially accessing mailboxes, SharePoint, Teams, and directory data. A second wave of targeted attacks from IP address 144.172.64[.]128 was observed on October 15, targeting 16 tenants in sensitive sectors, though no further activity has been confirmed. ConnectWise has suspended Cloud Backup and related services while investigation and remediation continue.

AI-extracted · verify before operational use