Microsoft 365 users exposed to ransomware attack

Millions of Microsoft Office 365 users were exposed to a massive zero-day Cerber ransomware attack last week.

Steven Toole, a researcher for the cloud-security firm Avanan, blogged that his company saw the first attack roll in at 6:44 a.m. on June 22 and that at least 57 percent of all Office 365 customers received at least one phishing attempt that contained the infected attachment.