Jump to content
Tuts 4 You
Sign in to follow this  

First Crackme

Recommended Posts


Language: C/C++
Platform: Windows x86
OS Version: Windows
Packer / Protector: None


Simple obfuscation. Change "input a number" text. 

Gold: add +1 to sum factorial





Edited by mattheig
wrong exe (see edit history)

Share this post

Link to post

Program cannot start because VMprotect dll is missing


Packer / Protector: None

Are you sure this is using no packer or protector?

  • Like 1

Share this post

Link to post

[*] Changed the textsb40XYS.png


How I did it?



Simply by breaking the runtime in this address: 00CA675B then you would be able to see the text in the edx register, so I changed that text from memory dump as you can see here KKPnhzF.png




[*] Added +1 to sum factorial


How I didt it?


Same story go to 00CA5070 and edit the eax reg


For now that the addresses are well know you can easily calculate the string value and change edit these reg values by patching the exe so it always return what ever you want.

Edited by ForlaxPy
More details (see edit history)
  • Like 2

Share this post

Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Create New...