Which system calls are most likely to be used by a keylogger?

Keyloggers or keystroke logging, or keyboard capturing are programs that are used to record keystrokes. These are used by hackers to steal information. A keylogger can be hardware or software. Keyloggers use several keys to monitor or capture the keyboard information.

One popular key is the key that is API based; these key loggers hook the keyboard APIs inside a running application. The information is recorded like an application instead of malware.

The keyloggers record the activities using the Windows API such as GetAsyncKeyState (), GetForegroundWindow (). They are used to poll the state of the keyboard or to subscribe to keyboard events. The programs for keylogging are legal because it allows an organization to keep an eye on what their employees do.