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Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
This is a Trojan written in Delphi. The original filename is SLIDESCR.EXE. When executed under Windows 95, it blocks the task manager and opens a messagebox with the following text:
Oops, looks like somebody doesn't like you very much !
You have to finish this sliding tile puzzle before you
can continue whatever it is you're doing !
Use the cursor keys to move the pieces (black piece is
the empty one).
After 'OK' is pressed, the Trojan splits Windows desktop into several parts, mixes them and waits for the user to restore the original desktop by solving the sliding tile puzzle. It also swaps functions of cursor keys: 'Up' becomes 'Down', 'Left' becomes 'Right' and that makes solving the puzzle more difficult. There's no way to continue working with other Windows applications until you complete the puzzle. Under Windows NT the task manager is not blocked by the Trojan and the puzzle task could be killed.
If the Trojan is executed from a DOS session (full screen mode) the desktop data is not acquired correctly and the puzzle parts are blank. This happens because the desktop image is acquired by the Trojan before Windows switches from DOS screen to its desktop.