When I posted on this topic before, the hidden object had disappeared the next time I did a scan.
I just did another such scan, and I found a hidden object "cpuz138_x64.sys".
At http://www.file.net/process/cpuz138_x64.sys.html it says:
Cpuz138_x64.sys file information
The process known as cpuz138 or CPUID Driver belongs to software CPUID service by CPUID.
Description: Cpuz138_x64.sys is not essential for the Windows OS and causes relatively few problems. Cpuz138_x64.sys is located in a not identifiable folder. The file size on Windows 10/8/7/XP is 0 bytes. http://www.file.net/process/cpuz138_x64.sys.html
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. It is not a Windows system file. There is no information about the author of the file. Note: File does not exist any longer. Therefore the technical security rating is 35% dangerous.
Recommended: Identify cpuz138_x64.sys related errors
Important: Some malware camouflages itself as cpuz138_x64.sys. Therefore, you should check the cpuz138_x64.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.