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Thursday, April 24, 2014
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HellBound Hackers | Challenges | Patching

Author

need explanation in patching 1

fuser
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Posted on 05-05-08 16:41
so i opened up patch1 and found the password, and of course, the instruction is to nop over the jump.

so i naturally assumed that all i had to do is to find all the jump if zero instruction (jz) and replace it with nop's .

but there are quite a lot of jz's here, so i was wondering if i was doing it properly, or should i redo everything?


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Author

RE: need explanation in patching 1


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Posted on 11-05-08 08:50
you want to nop the jump that determines whether you see the win message or it says you're wrong. that's the only one you do it to.




Edited by on 11-05-08 08:51
Author

RE: need explanation in patching 1

Uber0n
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Posted on 11-05-08 10:55
fuser wrote:
so i naturally assumed that all i had to do is to find all the jump if zero instruction (jz) and replace it with nop's .


There are always tons of instructions and comparisons in every application. If you modify every single jump the application will definately not work at all, just try to find the important one.

Read some basic articles on cracking/debugging if you still can't beat it Wink


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