Just a few days ago, Imperva’s Application Defense Center (ADC) research arm unveiled its August Hacker Intelligence Initiative Report at Black Hat USA 2015. The report details how an MITC attack can co-opt popular file synchronization services, such as OneDrive, Google Drive, Box and Dropbox, turning them into devastating attack vectors not easily detected by common security measures. 

Full post at https://www.skyfence.com/blog-new-cloud-threat-for-2015/ with details on protection and recovery.