Microsoft Teams can still double as a Living off the Land binary (LoLBin) and help attackers retrieve and execute malware from a remote location. Previous efforts from Microsoft to eliminate this hazard work to an extent but cannot stop attackers from abusing Teams to plant and run their payloads.
https://www.bleepingcomputer.com/news/security/hackers-can-abuse-microsoft-teams-updater-to-install-malware/
https://www.bleepingcomputer.com/news/security/hackers-can-abuse-microsoft-teams-updater-to-install-malware/