I Received “Hack Tool Detected” When I Played Cabal Online

Last night when I played Cabal Online, this message appeared when I’m about to play. The game started normally as usual when the launcher opened. I then log in to the game to start my game session. When the game logged me in and it was still loading the interface or the game environment, the message “Hack tool detected” suddenly appeared then everything closed.
I got surprised because I don’t have anything running aside from the game though earlier I installed a program called “Free Download Manager” and it is running in the system tray as a startup program. I restarted the computer, terminated some programs in the system tray including Free Download Manager then everything works well again. Just wondering what caused the message to appear.
