downloadbrowsejosh's PatchMe

Download patchme.zip, 10 kb (password: crackmes.de)
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You have to patch this software to solve the challenge.

The problem:
The Win32 executable waits for an input into the textbox and a mouseclick in the "Output" Pushbutton. If the input is correct, it outputs a text. If the exe is patched correctly, the text output is "Hello World!".
The requested solution has only one bit changed in the patched version compared to the unpatched version.

Required for a valid solution: The file offset in the exe file to be patched, together with the old value and the new (patched) value. Both values must differ by one bit only.

If you have a little Windows programming experience, it should be not difficult to solve the problem.


Have fun!

-josh

Difficulty: 1 - Very easy, for newbies
Platform: Windows
Language: C/C++

Published: 20. Oct, 2010
Downloads: 1029

Rating

Votes: 5
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Discussion and comments

EvOlUtIoN
20. Oct 2010		Easy, but fun in some way.

Put in textbox "130"
Then change
004010EA B8 C8000000 MOV EAX,0C8
with:
004010EA B8 C7000000 MOV EAX,0C7

One bit changed and solved

Bye
redoC
20. Oct 2010		evolution: C8 -> C7 it's not one bit, solution is

130, offset 0x4011B5 change 100 to 101

level 1 crackme
EvOlUtIoN
22. Oct 2010		yes true...just one stupid mistake, anyway yes, level 1 definitely.
brilight
31. Mar 2012		This program needs VC redist to be run
Does not run on XP by default
cracknoob
12. Nov 2013		uau congrat guys im a total noob and isnt so easy --'
absolute_stratos
12. May 2014		Really new to reversing, took me a while to figure out the "Hello World" part but I eventually figured it out. Really enjoyed it as a noob. Thanks for making it! : )
seskissinger2
30. Jan 2015		set the static or global variable from 100 to 101.

To show the "Hello World". Jmp at

CMP eax, 1388


to avoid quit the program if you are in Debugger

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