What is tunnel.exe? Should I remove it?

tunnel.exe is an executable file that starts a malicious process, launches certain parasite components or runs a destructive payload. Even if the tunnel.exe file does nothing suspicious, its presence indicates that your computer is infected with a particular threat.
The tunnel.exe file is installed and used by trojan Tunnel Trojan.
You are highly advised to scan the system, delete executable tunnel.exe and terminate all the processes it started.
Please note that the tunnel.exe file actually may be a fully legitimate part of the operating system or legitimate software. Often parasites use files with unsuspicious names, but malicious functionality. You should always carefully check the file before deleting it. It may not be related with malware, but can be required by your essential programs to work properly.