Anyone into reverse engineering - Ollydbg

Kivanc · 25 Apr 2019 at 09:36

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 · 25 Apr 2019 at 15:53

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 · 25 Apr 2019 at 16:33

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 · 26 Apr 2019 at 07:08

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 · 26 Apr 2019 at 10:24

Kivanc said:
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 · 26 Apr 2019 at 11:17

Cromulent said:
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...