d-e-f-e-a-t / howtocrack

How to 'touch' an app (with good intentions ofc)

HowTo Crack

Introduction 2 Ethical Cracking

TODO:

• Move lesson instructions to their folders
• Write docs

Lesson 1

An easy hex edit example

Edit the executable and replace 'Press Me' button text with 'Press&ME' (char 20 to 26)

then press ALT-M -> job done

Lesson 2

debug application in x64dbg

search for string : 'NOT REGISTERED'

check execution code when registration is not valid

replace JNE with NOP (2x)

job done

Links

The Art of Assembly Language Programming

http://www.it.uom.gr/project/assembly/contents.htm

http://www.ollydbg.de/ [outdated]

http://x64dbg.com/#start

http://frhed.sourceforge.net/en/

http://www.agner.org/optimize/