Abaddon’ remote access trojan may be the first to use Discord as a command and control server that instructs the malware on what tasks to perform on an infected PC. Even worse, a ransomware feature is being developed for the malware. The malware will automatically steal the following data from infected PC: Chrome cookies, saved credit cards, and credentials. It will then connect to Discord every ten seconds to check for new commands to execute, as shown by the image below. Abaddon will connect to the Discord C2 every 10 seconds for new tasks to execute.
Source: https://www.bleepingcomputer.com/news/security/new-rat-malware-gets-commands-via-discord-has-ransomware-feature/