Malware developers and attackers are abusing the Discord chat service by using it to host their malware, act as command and control servers, or by modifying the chat client to perform malicious behavior. We take a look at three ways that Discord is being used; as a malware hosting and distribution service, a malware communications server, and through client modifications. While Discord is designed as a chat service, it allows members to upload files to a chat channel so that others can download them. The good news is that Discord does perform some sort of file scanning or blocking of malicious files, but most malicious downloads are not flagged.
Source: https://www.bleepingcomputer.com/news/security/discord-abused-to-spread-malware-and-harvest-stolen-data/