Microsoft warns that Chinese threat actors use the Quad7 botnet, compromised of hacked SOHO routers, to steal credentials in password-spray attacks. [...]
source https://www.bleepingcomputer.com/news/security/microsoft-chinese-hackers-use-quad7-botnet-to-steal-credentials/
source https://www.bleepingcomputer.com/news/security/microsoft-chinese-hackers-use-quad7-botnet-to-steal-credentials/