Possible Nexon Database Exploit?

Thanks, Guang. I'll look into it.

However I already went to the second site you linked and tried a program, but my current AV software detected what it says were trojans, while the program says they're not. So I think I'll just leave it as is and resort to formatting.

@Above,

Open your Maplestory folder and double-click on "Gamelauncher".

No no no, the 2nd site I sent you are hosts of such key-loggers (for personal use). That was just to show you that there ARE professional programs out there designed to try to get by your regular antivirus softwares (I was trying to illustrate the point that people are constantly designing new keyloggers/spywares, and that your AV might not pick up on all of them as a result).