Prevent an application from being closed by the user through the task manager

Question

Prevent an application from being closed by the user through the task manager

Asked 9 years, 4 months ago

Viewed 2,303 times

5

I have a C# application that cannot be closed by the user. But even if I eliminate all the means to close the application, including by itself, it is still possible to finish the process by the task manager. Can you prevent this? You can remove the application from the task manager?

Your question is weird. Do you want to remove or what to prevent you from removing from the task manager? Or what you want is to prevent the program from being shut down in any way?

– Maniero

2015/02/24 at 13:30
Another issue worth considering, the user who can close the process has administrator permissions?

– Omni

2015/02/24 at 13:31
I think it just wants to stop the user from finishing the process, but the process itself can end, as some antivirus work (which run at a blocked access level).

– Guilherme Nascimento

2015/02/24 at 13:32
Sorry for the confusion in the question, the user has administrator permission and do not want the user to close the application.

– Pedro Soares

2015/02/24 at 13:37
There is a way, use Hooks.

– Frederico Cruz

2016/12/13 at 14:47

2 answers

9

Generally that is not possible, especially by a code in your application. The application itself has no control over this.

The most that is possible is not giving privilege to close (TERMINATE) the process when installing the program. But this does not completely solve. Thankfully no software can do this.

The user can prevent the software from running automatically at the next startup and it will definitely kill your program easily. So it’s not worth the effort.

If he knows what he’s doing it’s possible to give the privilege on its own without having to give one boot on the machine. There are specialized software that kills processes that cannot be killed. The Process Explorer from Microsoft can help do this.

Surely there are some possible tricks like capturing the NtTerminateProcess in the kernel or create another program that monitors this main one. But no trick is effective. What’s worse is that you think you’re protected when you’re really not.

Forget this idea.

Thanks for your help, I’ll see what I can do about it.

– Pedro Soares

2015/02/24 at 13:53

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by Pedro Soares • **1,136** points · Answer 1 · 2015-02-24T20:09:00+00:00

The solution I found was to keep checking the processes and if the user opens the task manager I close it. I made a Thread for that purpose.

        public void antiGerenciadorDeTarefas() {
            while (true) {
                Process[] processos = Process.GetProcesses();
                foreach (Process processo in processos) {

                    if (processo.ProcessName.Equals("Taskmgr")) {
                        processo.Kill();
                    }
                }
                Thread.Sleep(1000);
            }

        }