How to code keylogger in C programming language : C codechamp has brought you a detailed tutorial on how to write a Keylogger code in C programming.
C program of Keylogger or keystroke logger : Keylogger
is a computer program which captures all the key strokes pressed by
user in real time. It captures all the keys and write them to some file
say log.txt and stores it on computer hard disk. Now sending these logs
to emails or FTP address depends upon the type of keylogger that is
keylogger is remote keylogger or physical keylogger.
Physical keyloggers are useful when you have physical access to that
system and can retrieve logs personally. While remote keyloggers can be
used from anywhere in the world, the only requirement is that victim
must have internet connection. Today we will be writing a C program of Physical keylogger or Keystroke logger
which requires physical access of the system. We will be extending our
logic in further programs to make it remote keylogger which sends logs
to FTP’s and Emails directly. So first of all lets see how simple
keylogger program works…
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| C program of Keylogger or Keystroke logger |
Algorithm for writing a Simple Keylogger :
1. Create an Empty log file for storing keylogs.
2. Intercept keys pressed by user using GetAsyncKeyState() function.
3. Store these intercepted values in file.
4. Hide the Running Window Dialog to make it undetectable.
5. Use while loop to make it running in all conditions.
6. Add Sleep() function to reduce the CPU usage to 0%.
Now let us see the C program of keylogger or keystroke logger which
intercepts all the keys pressed by the user and store these pressed keys
in log file.
in the upper left hand corner, and click on header file .h
