How to delete /var/run/com.cyberghostsrl.CyberghostPrivilegedHelper.socket?
The "file" (the name suggests it's actually a socket) is probably getting recreated by cyberghost every time the computer starts up. If you want to get rid of it, you need to completely remove cyberghost. I'm not familiar with cyberghost, but it may install some files besides the app itself, that you'll have to track down and remove.

There are some uninstall guides online that're fairly generic, but should give you the info you need to find &amp; remove the relevant files. One thing that might be missing from a generic guide is removing launch daemons and agents: You'll need to look for related files in the folders /Library/LaunchDaemons, /Library/LaunchAgents, and (inside your home folder) ~/Library/LaunchAgents.