Anyone into reverse engineering - Ollydbg

[Kivanc]

For instance, When I change the JNZ instruction to JE the application runs in Ollydbg 1.10 with no problem. But when I close Ollydbg and click on the file that I changed, it pops a message which says "The file seems to be corrupt." Why is this happening?

 

[peterwalkley]

At a random guess you are breaking a checksum by making changes in the middle of the file. Have you searched / asked on stack overflow ? There's a far bigger community there.

 

[touch]

I'd agree with @peterwalkley
what changes are you trying to make? If it's anything to do with removing licence/authorisation checks or increasing trial period of the software it'll almost certainly be a checksum causing it.

 

[Kivanc]

Thanks… I'll ask on stack overflow.



Sort of.. I edited the email field in order to change the behavior of the field in registration window. So it won't pop up the message "You have entered an invalid email format."​

 

[Cromulent]

Thanks… I'll ask on stack overflow.



Sort of.. I edited the email field in order to change the behavior of the field in registration window. So it won't pop up the message "You have entered an invalid email format."​

There is a dedicated stack exchange for reverse engineering.

https://reverseengineering.stackexchange.com/

You'll get better help there than on Stack Overflow.

 

[Kivanc]

There is a dedicated stack exchange for reverse engineering.

https://reverseengineering.stackexchange.com/

You'll get better help there than on Stack Overflow.

Cool Thanks a lot...