A more recent example simply polls the BIOS for pre-boot authentication PINs that have not been cleared from memory. are used to poll the state of the keyboard or to subscribe to keyboard events. Windows APIs such as GetAsyncKeyState(), GetForegroundWindow(), etc.The keylogger receives an event each time the user presses or releases a key. The keylogger registers keystroke events as if it was a normal piece of the application instead of malware. API-based: These keyloggers hook keyboard APIs inside a running application.A keylogger using this method can act as a keyboard device driver, for example, and thus gain access to any information typed on the keyboard as it goes to the operating system. They are frequently implemented as rootkits that subvert the operating system kernel to gain unauthorized access to the hardware. Such keyloggers reside at the kernel level, which makes them difficult to detect, especially for user-mode applications that do not have root access. This method is difficult both to write and to combat. ![]()
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