After seeing thousands of attacks since January, security researchers warn that attackers are compromising Microsoft Teams accounts to slip into chats and spread malicious executables to participants in the conversation.According to the report published by Avanan, the threat actor accesses a compromised Teams account and inserts an executable file called “User Centric” in a chat to trick the user into running it. Once executed, the malware writes data into the system registry, installs DLLs, and establishes persistence on the Windows machine.The researchers say that the issue is aggravated by "the fact that default Teams protections are lacking" and "many email security solutions do not offer robust protection for Teams."