Security firm Avanan has warned that Microsoft Teams users are being targeted by hackers who are attaching .exe files to Teams chats. These files put a Trojan on the end-user’s computer which is used to install malware, eventually leading to the user’s computer being taken over. The security advice is to use protection that downloads all files in a sandbox and inspects them for malicious content, deploy robust, full-suite security that secures all lines of business communication (including Teams), and not to click on any unfamiliar file in a chat.