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Researchers warn that documents hosted in the cloud might not be out of reach for ransomware actors and that while they’re harder to permanently encrypt due to the automated backup features of cloud service, there are still ways to make life hard for organizations.

Researchers from Proofpoint have devised a proof-of-concept attack scenario that involves abusing the document versioning settings in Microsoft’s OneDrive and SharePoint Online services that are part of Office 365 and Microsoft 365 cloud offerings. Furthermore, since these services provide access to most of their features through APIs, potential attacks can be automated using ​​command-line interface and PowerShell scripts.

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