Several users are reporting that their QNAP Network-Attached Storage (NAS) devices are being subject to brute-force attacks.
Devices from Taiwanese storage manufacturer QNAP have been at the receiving end of various cyber attack campaigns lately.
QNAP has been very active in patching vulnerabilities in their devices. Late last year it fixed a cross-site scripting vulnerability, and issued patches to neutralize malware that used the QNAP device to mine cryptocurrency, earlier this year.
https://www.techradar.com/news/qnap-nas-devices-still-facing-huge-number-of-online-attacks