Part 30 - ASM Hacking 3 [Moving Data Between Memory And Registers]

For a complete table of contents of all the lessons please click below as it will give you a brief of each lesson in addition to the topics it will cover. https://github.com/mytechnotalent/Reverse-Engineering-Tutorial

Let’s hack!

Specifically we will move the value of inside the constant integer of 10 decimal into ECX like before.

We open GDB in quiet mode and break on _start and run by following the commands above.

As we can see when we info registers the value of ECX is 0. Let’s do a si and another si.

As you can see the value of ECX is 10 decimal or 0xa hex as it was in the prior lesson now lets hack that value to something else.

Let’s set $ecx = 1337 and do an i r.

As you can clearly see we have hacked the value of ECX to 0x539 hex or 1337 decimal.

As I have stated throughout this series. Each of these lessons are very bite-sized examples so that you get the hard muscle memory on how to hack through a variety of situations so that you ultimately have a complete mastery of processor control.

I look forward to seeing you all next week when we dive into creating our fourth assembly program!