IDA Pro x86 lib hacking: Returning false/true

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Hello dear community,

Today, i will teach you how to mod x86 libs. x86 is not that hard to understand because the instruction are almost the same as ARM. In this tutorial, i mod the game named The Sandbox 2 and unlock everything.

Now let's start modding.

First of all, you need IDA PROand Hex Workshop installed on your computer. If you already have them installed, go to next step

Open the APK file with WinRar and extract the lib folder (In case you want to mod both x86 and ARM)

Open the x86 .so file in IDA. You will see the dialog box similar to the following:

In x86, you don't need to change anything. MetaPC is fine. Click OK to disassemble the lib file, and let it fully load. After that, press CTRL + F,  search "isElementUnlocked" and double click on the function to open it

Remember the offset (9869E0) of first instruction. we need to use it later.

Note: The offset will change each update.

 

Open Hex Workshop or other hex editing program, and search the offset. I'm using Hex Workshop

 

Here is the offset of isElementUnlocked

You can view hex between IDA pro and Hex editor program to make sure that it is the correct function

The function isElementUnlocked sounds like a boolean function, which means it return true or false. For example: If we purchase unlock everything, it will return true, if not, it will return false. It's just like when you ask someone "are elements unlocked in the game?" and someone answer "yes!" or "no!"

If you want permanent unlock without purchase, replace the number 55 57 56 53 e8 87 with b8 01 00 00 00 c3, and it will permanent return true. In x86 instructions, it will look like

mov eax, 1 = b8 01 00 00 00

retn = c3

and false is

mov eax, 0 = b8 00 00 00 00

 

When you open the modded .so file in IDA, your modded instruction will look like:

Open the APK with WinRAR and replace the modded .so file. Re-sign the APK, install it and run the game.

Credits:

iAndroHacker

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