[Xogg]

So this thread will show you a few snippets of code to make your applacation un-closable. So the first thing you will need to do is remove the "X" button on the app.

Code

Me.ControlBox = False

You also will need to remove it from the TaskBar, use the following code to do so.

Code

Me.ShowInTaskbar = False

From here we want to disable the task manager and CMD so the user can not close it like that. Use this code in a timer to do so 

Code

Try
           Dim p As Process
           For Each p In Process.GetProcesses
               If p.ProcessName = "taskmgr" Then
                   p.Kill()
               End If
                 If p.ProcessName = "cmd" Then
                    p.Kill()
                End If
           Next
       Catch ex As Exception

       End Try
   End Sub

Then we need to disable right click in our app use the following code to do so.

Code

Try

           Dim Registry As Object

           Registry = CreateObject("WScript.Shell")

           Registry.RegWrite("HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" & "\NoViewContextMenu", 0, "REG_DWORD")
       Catch
       End Try

Also no need to worry that will only disable in that app!  :)

Now there is one more thing we will do the be 100% sure that this is unclosable this will handle all other close methods. 

Code

   Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
       Dim i As Integer = 0
       If i = 0 Then
           If (e.CloseReason = CloseReason.UserClosing) Then
               e.Cancel = True
           End If
       End If
   End Sub

[Zilog80]

Code

taskkill /f /im something.exe

Profit

[Xogg]

Code

taskkill /f /im something.exe

Profit

Working on a fix

Fix has been found posting it now!

[VmX5]

Process Hacker?

How about forcefully crashing the program?

[Xogg]

Process Hacker?

How about forcefully crashing the program?

What do you mean forcefully crashing it?
Will look into Process hacker.

[VmX5]

What do you mean forcefully crashing it?
Will look into Process hacker.

Inject faulty code like 0 / 0

[Zilog80]

Working on a fix

Fix has been found posting it now!

The 'fix' is closing cmd? 😧

ComputerA: something.exe
ComputerB:

Code

taskkill /s {remote pc} /u {domain | username} /p {password} /PID {process id}

Profit

Read: https://blogs.technet.microsoft.com/chra...s-2-steps/

[VmX5]

Oh and on your cmd fix you can rename cmd and run it.

[Barret]

oh u silly kids ^^ this is so easy to omit, but keep trying :)

[Zilog80]

For educational purposes only:

Spoiler (Click to View)

PHP Code


<?php 
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
public class CriticalProcess 
{ 
    [DllImport("ntdll.dll", SetLastError = true)]
    private static extern int NtSetInformationProcess(IntPtr hProcess, int processInformationClass, ref int processInformation, int processInformationLength); 
    static void Main(string[] args) 
    { 
        int isCritical = 1;
        int BreakOnTermination = 0x1D;
        Process.EnterDebugMode();
        NtSetInformationProcess(Process.GetCurrentProcess().Handle, BreakOnTermination, ref isCritical, sizeof(int)); 
    } 
} 


Try to 'terminate' an app with the above [ sp ] code...

Spoiler (Click to View)
BSoD for the Win

[zonne]

This is easilly exploitable.

[Xogg]

For educational purposes only:

Spoiler (Click to View)

PHP Code


<?php 
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
public class CriticalProcess 
{ 
    [DllImport("ntdll.dll", SetLastError = true)]
    private static extern int NtSetInformationProcess(IntPtr hProcess, int processInformationClass, ref int processInformation, int processInformationLength); 
    static void Main(string[] args) 
    { 
        int isCritical = 1;
        int BreakOnTermination = 0x1D;
        Process.EnterDebugMode();
        NtSetInformationProcess(Process.GetCurrentProcess().Handle, BreakOnTermination, ref isCritical, sizeof(int)); 
    } 
} 


Try to 'terminate' an app with the above [ sp ] code...

Spoiler (Click to View)
BSoD for the Win

Wanta do a conversion to VB for me? Lmfao

[Ninja]

Code

Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
       Dim i As Integer = 1
       If i = 0 Then
           If (e.CloseReason = CloseReason.UserClosing) Then
               e.Cancel = True
           End If
       End If
   End Sub

How will i ever be 0?

[Nick (Name)]

Or how about making it a protected system process? Sounds like a much better way to make your process harder to kill, but not "unkillable" because there are ways of killing a process no matter what you do.

[Ninja]

Wanta do a conversion to VB for me? Lmfao

oh boy...



In all seriousness, you should be able to read/understand C# code if you know VB.net. Even if you don't, you can just make a DLL and reference that.