With more than 258 million active users users per month, Microsoft's Office 365 environment — like several other Microsoft technologies — has become a popular target for attackers.
Vectra AI recently analyzed data gathered from over 4 million Office 365 accounts between June and August. The security vendor found attackers are widely using Office 365 accounts to move laterally to other users and accounts within an enterprise, to carry out command-and-control communications, and other malicious activities.