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‎README.md

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# StopShutdown
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A small proof of concept that temporarily prevents a shutdown
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# WinAPI-Fun
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> A collection of (relatively) harmless prank / virus examples using the Windows API
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This really small program is handy if you have pesky friends / coworkers that think its funny to shutoff your computer while you are working. I had a problem with this in one of my classes, so I created an easy solution.
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<br>
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Pre-built binaries can be found in the [Releases](../../releases) section
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To reset most examples, re-launch and kill the program again
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<br>
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| File | Description |
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| -------------------------------------------------- | --------------------------------------------------------------------- |
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| [avoid.nim](src/avoid.nim) | The start button avoids mouse clicks by jumping around on the taskbar |
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| [bsod.nim](src/bsod.nim) | Triggers Blue Screen of Death |
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| [dripper.nim](src/dripper.nim) | Moves the current window down slightly every 10 seconds |
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| [highcontrast.nim](src/highcontrast.nim) | Enable high contrast mode system-wide |
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| [intercept_space.nim](src/intercept_space.nim) | Replaces space bar keypress with the word "space" |
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| [mouse_button_swap.nim](src/mouse_button_swap.nim) | Swap the left and right mouse buttons |
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| [mouse_trails.nim](src/mouse_trails.nim) | Creates a trail of mouse icons behind the cursor as it moves |
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| [mouse_trap.nim](src/mouse_trap.nim) | Traps the mouse cursor in the top right corner for 60 seconds |
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| [random_capslock.nim](src/random_capslock.nim) | Randomly toggle the Caps Lock every 0-30 seconds |
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| [random_close.nim](src/random_close.nim) | Randomly closes the current focussed window every 0-30 seconds |
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| [rotate.nim](src/rotate.nim) | Rotates the display 180 degrees |
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| [shake.nim](src/shake.nim) | Rapidly shakes the current focussed window |
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| [start_disable.nim](src/start_disable.nim) | Disables clicking the start button or taskbar |
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| [start_popup.nim](src/start_popup.nim) | Opens the start menu popup randomly every 0-60 seconds |
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| [stop_shutdown.nim](src/stop_shutdown.nim) | Temporarily prevents a shutdown with a custom message |
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| [time_local.nim](src/time_local.nim) | Adds the message "HI" to the AM/PM localization string system-wide |
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<br>
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## Requirements
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[Install Nim](https://nim-lang.org/install_unix.html) and the [Winim](https://github.com/khchen/winim) library, then compile with the `--app:gui` flag
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Note: if cross-compiling from Linux or macOS, also install the [mingw](https://www.mingw-w64.org/) toolchain and use the `-d:mingw` flag
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```sh
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nim c -d:mingw --app:gui src/avoid.nim
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```
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<br> <br>
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### USE AT YOUR OWN RISK

‎src/avoid.nim

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import std/random
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import winim
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let hWndTaskBar = FindWindow("Shell_TrayWnd", NULL);
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let hWndStart = FindWindowEx(hWndTaskBar, 0x0, "Start", "Start");
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var cursor: POINT
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GetCursorPos(&cursor)
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var rectTaskBar: RECT
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GetWindowRect(hWndTaskBar, &rectTaskBar)
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var rectStart: RECT
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GetWindowRect(hWndStart, &rectStart)
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# Reset Start Button Position
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SetWindowPos(hWndStart, 0x0, 0, 0, 0, 0, (SWP_NOSIZE or SWP_NOZORDER))
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var upperBound = rectTaskBar.right - rectStart.right;
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# Run callback everytime mouse is moved
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proc HookCallback(nCode: int32, wParam: WPARAM, lParam: LPARAM): LRESULT {.stdcall.} =
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GetCursorPos(&cursor)
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if cursor.x >= rectStart.left and cursor.x <= rectStart.right and cursor.y >= rectStart.top:
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var newX = rand(upperBound)
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SetWindowPos(hWndStart, 0x0, (int32)newX, 0, 0, 0, (SWP_NOSIZE or SWP_NOZORDER))
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GetWindowRect(hWndStart, &rectStart)
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return CallNextHookEx(0, nCode, wParam, lParam)
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# Hook LowLevelMouseProc
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var hook = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC) HookCallback, 0, 0)
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if bool(hook):
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try:
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PostMessage(0, 0, 0, 0)
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var msg: MSG
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while GetMessage(msg.addr, 0, 0, 0):
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discard
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finally:
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UnhookWindowsHookEx(hook)

‎src/bsod.nim

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import winim
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proc RtlAdjustPrivilege*(privilege: ULONG, bEnablePrivilege: BOOLEAN, isThreadPrivilege: BOOLEAN, previousValue: PBOOLEAN): NTSTATUS
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{.discardable, stdcall, dynlib: "ntdll", importc: "RtlAdjustPrivilege".}
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proc NtRaiseHardError*(errorStatus: NTSTATUS, numberOfParameters: ULONG, unicodeStringParameterMask: ULONG, parameters: PULONG_PTR, validResponseOption: ULONG, response: PULONG): NTSTATUS
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{.discardable, stdcall, dynlib: "ntdll", importc: "NtRaiseHardError".}
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var
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prev: BOOLEAN
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response: ULONG
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# SE_SHUTDOWN_PRIVILEGE = 19
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discard RtlAdjustPrivilege(19, TRUE, FALSE, &prev)
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discard NtRaiseHardError(STATUS_ASSERTION_FAILURE, 0, 0, NULL, 6, &response);

‎src/dripper.nim

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import os
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import winim
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var windowCoords: RECT
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while true:
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var hWnd = GetForegroundWindow()
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GetWindowRect(hWnd, &windowCoords)
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SetWindowPos(hWnd, 0x0, windowCoords.left, windowCoords.top + 2, 0, 0, (SWP_NOSIZE or SWP_NOZORDER))
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sleep(10000)

‎src/highcontrast.nim

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import winim
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var contrast: HIGHCONTRASTA
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contrast.cbSize = (int32)sizeof(HIGHCONTRASTA)
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SystemParametersInfoA(SPI_GETHIGHCONTRAST, (int32)sizeof(HIGHCONTRASTA), &contrast, 0)
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contrast.dwFlags = contrast.dwFlags xor HCF_HIGHCONTRASTON
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SystemParametersInfoA(SPI_SETHIGHCONTRAST, (int32)sizeof(HIGHCONTRASTA), &contrast, 0)

‎src/intercept_space.nim

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import winim
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type
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SendKeys = array[12, INPUT]
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proc SendSpace() =
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var inputs: SendKeys
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# Hold shift for caps
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inputs[0].type = INPUT_KEYBOARD
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inputs[0].ki.wVk = VK_SHIFT
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# S key
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inputs[1].type = INPUT_KEYBOARD
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inputs[1].ki.wVk = 0x53
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inputs[2].type = INPUT_KEYBOARD
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inputs[2].ki.wVk = 0x53
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inputs[2].ki.dwFlags = KEYEVENTF_KEYUP
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# P key
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inputs[3].type = INPUT_KEYBOARD
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inputs[3].ki.wVk = 0x50
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inputs[4].type = INPUT_KEYBOARD
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inputs[4].ki.wVk = 0x50
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inputs[4].ki.dwFlags = KEYEVENTF_KEYUP
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# A key
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inputs[5].type = INPUT_KEYBOARD
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inputs[5].ki.wVk = 0x41
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inputs[6].type = INPUT_KEYBOARD
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inputs[6].ki.wVk = 0x41
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inputs[6].ki.dwFlags = KEYEVENTF_KEYUP
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# C key
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inputs[7].type = INPUT_KEYBOARD
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inputs[7].ki.wVk = 0x43
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inputs[8].type = INPUT_KEYBOARD
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inputs[8].ki.wVk = 0x43
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inputs[8].ki.dwFlags = KEYEVENTF_KEYUP
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# E key
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inputs[9].type = INPUT_KEYBOARD
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inputs[9].ki.wVk = 0x45
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inputs[10].type = INPUT_KEYBOARD
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inputs[10].ki.wVk = 0x43
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inputs[10].ki.dwFlags = KEYEVENTF_KEYUP
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# Release shift key
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inputs[11].type = INPUT_KEYBOARD
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inputs[11].ki.wVk = VK_SHIFT
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inputs[11].ki.dwFlags = KEYEVENTF_KEYUP
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SendInput((UINT)len(inputs), &inputs[0], (int32)sizeof(INPUT));
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# Run callback everytime key is pressed
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proc HookCallback(nCode: int32, wParam: WPARAM, lParam: LPARAM): LRESULT {.stdcall.} =
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if (bool(lParam)):
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var kbd: PKBDLLHOOKSTRUCT = cast[ptr KBDLLHOOKSTRUCT](lparam)
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if (kbd.vkCode == VK_SPACE):
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if (wParam == WM_KEYDOWN):
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SendSpace()
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return 1
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elif (wParam == WM_KEYUP):
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return 1
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return CallNextHookEx(0, nCode, wParam, lParam)
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# Hook LowLevelKeyboardProc
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var hook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC) HookCallback, 0, 0)
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if bool(hook):
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try:
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PostMessage(0, 0, 0, 0)
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var msg: MSG
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while GetMessage(msg.addr, 0, 0, 0):
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discard
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finally:
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UnhookWindowsHookEx(hook)

‎src/mouse_button_swap.nim

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import winim
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# If buttons were already swapped, return back to normal
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if (SwapMouseButton(TRUE)):
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SwapMouseButton(FALSE)

‎src/mouse_trails.nim

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import std/random
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import winim
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var trails: int32
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SystemParametersInfoA(SPI_GETMOUSETRAILS, 0, &trails, 0)
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if (trails < 2):
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trails = (int32)rand(2..9)
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else:
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trails = 0
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SystemParametersInfoA(SPI_SETMOUSETRAILS, trails, NULL, 0)

‎src/mouse_trap.nim

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import std/os
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import winim
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var rect: RECT
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SetRect(&rect, 0, 0, 100, 100);
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ClipCursor(&rect);
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sleep(60000)
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ClipCursor(NULL);

‎src/random_capslock.nim

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import std/os
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import std/random
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import winim
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type
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SendKeys = array[2, INPUT]
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var inputs: SendKeys
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# Key Down event
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inputs[0].type = INPUT_KEYBOARD
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inputs[0].ki.wVk = VK_CAPITAL
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# Key Up event
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inputs[1].type = INPUT_KEYBOARD
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inputs[1].ki.wVk = VK_CAPITAL
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inputs[1].ki.dwFlags = KEYEVENTF_KEYUP
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# Send keypress randomly
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while true:
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SendInput((UINT)len(inputs), &inputs[0], (int32)sizeof(INPUT));
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sleep(rand(30000))

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