Microsoft’s OneDrive suddenly takes a big jump in hosting malicious files

mood · Jun 25, 2019

Microsoft’s OneDrive suddenly takes a big jump in hosting malicious files
June 25, 2019
https://www.onmsft.com/news/microsofts-onedrive-suddenly-takes-a-big-jump-in-hosting-malicious-files

Microsoft’s OneDrive has seen a rather significant rise in usage to host malicious files. According to a report from FireEye (via BleepingComputer), the file hosting service has seen a surge of users hosting malicious files grow to more than 60% last quarter compared to the previous rise of just a single-digit percentage point.

According to FireEye, OneDrive has seen the most significant jump of the other three services tested—Dropbox, Google Drive, and WeTransfer—in the percentage of use of malicious files stored on its service.
“Attackers find these well-known and trusted sites useful because they bypassed initial domain reputation checks performed by security engines,” the document explains.

“Rather than sending an email with an attached file containing malicious content directly to a target, the attackers upload the content to the file sharing site [...] Some of these services also offer a preview of the file showing content in a URL that can be clicked without having to download the file. This makes the attack very efficient and difficult to detect”
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