It ultimately turned out to be a backdoor account[2]. Backdoors really upset me. Every reasonable "you can't blame people for mistakes" goes out the window when it's not a mistake.

Following the ransomware, they released an auto-installing malware remover. A Python script that detected one particular piece of code associated with this recent attacker. That malware remover was a python script full of vulnerable exec calls introducing multiple new RCEs.

[0] https://www.qnap.com/en/security-advisory/qsa-21-11 [1] https://www.qnap.com/de-de/security-advisory/qsa-21-05 [2] https://www.bleepingcomputer.com/news/security/qnap-confirms... [3] https://www.qnap.com/en/security-advisory/qsa-21-16