No threats found.
So when you switched from the Ubuntu mini pc back to synology, how did you install on the Synology?
What browser &pc are you attempting to get to the website? Can you try from a different pc or browser?
If you installed natively on the Synology, have you tried logging into the Synology, open the Channels DVR thru the package center?
File Station won't allow you to see a lot of the directories.
Use find to search for the file.
sudo find / -name stealth_browser_api.bin
It may take awhile to search. It will print the directory and filename if it finds it.
Example:
sudo find / -name ping-test.log
/volume1/arkives/ping-test.log
/volume1/@appdata/ContainerManager/all_shares/arkives/ping-test.log
sudo find / -name termcap
/etc.defaults/termcap
/etc/termcap
It might be part of a package or container you installed.
Finding out where the file is (using sudo find / -name stealth_browser_api.bin) and what launched it (using sudo ps -DefFl) will help.