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Sharepoint online onedrive5/28/2023 ![]() ![]() ![]() This leads to an account takeover, then discovery of data within the SharePoint and OneDrive environment and eventually a breach of data and ransomware attack. The attack chain assumes the worst and starts with an initial compromise of an Office 365 user’s account credentials. “Proofpoint has discovered a potentially dangerous piece of functionality in Office 365 or Microsoft 365 that allows ransomware to encrypt files stored on SharePoint and OneDrive in a way that makes them unrecoverable without dedicated backups or a decryption key from the attacker,” according to researchers. The research comes from Proofpoint, which lays out what it say is “potentially dangerous piece of functionality” in a report released last week. However, researchers say that is not always the case and files stored on SharePoint and OneDrive can be vulnerable to a ransomware attack. Those files, stored via “auto-save” and backed-up in the cloud, typically leave end users with the impression data is shielded from a ransomware attack. ![]() Researchers are warning attackers can abuse Microsoft Office 365 functionality to target files stored on SharePoint and OneDrive in ransomware attacks. ![]()
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