What is the issue?
A new phishing campaign purporting to come from the "Office 365 Team" is underway that warns recipients that there has been a high amount of file deletions occurring on their account.
More details on the campaign
It is to be noted that the spoofed page is hosted on Azure and is secured with a certificate signed by Microsoft. This adds legitimacy to the scam by making it appear as a Microsoft-sanctioned URL.
Contents of the phishing email
“A medium-severity alert has been triggered
Unusual volume of file deletion
Time: 05/26/2019 07:36:39 pm (UTC)
Details: 15 matched activities in 5 minutes.
View alert details,” the email read, BleepingComputer reported.
If a Microsoft login form is presented from any URL other than microsoft.com, live.com, and outlook.com domains, then do not enter your credentials.