This is the example of my Android Inline Hook Project in thumb mode. So I will only update that repo.

The target APP is thumb-2-example.apk and our .so file has already been compiled in /libs/armeabi-v7a/libInlineThumbHook.so.

In this APP, you should wait for more than 30 seconds and it will show Enough. You Win! in the middle of the screen. After the example libInlineThumbHook.so is effective, the register R0 will be set to 0x333 (>10) so you will get Enough. You Win! immediately.

notThumbHooked.mp4 shows the APP run in a normal environment.

ThumbHooked.mp4 shows the APP run in a hooked environment.

The pictures of effect are showed below:

Android Inline Hook

This project make an Android .so file that can automatically do some native hook works.

It mainly use Android Inline Hook, not PLT Hook.

If you can read Chinese or wanna see more picture, I've wrote some articles about this repo and the first one is the main article. I highly recommend you to read the articles before reading the code. These article will save you a lot of time, I promise.

1. Android Inline Hook Practice
2. Opcode Fix In Android Inline Hook
3. An Introduction to Android Native Hook

How To Use

The only thing you have to change is the code in InlineHook.cpp.

You can name the __attribute__((constructor)) ModifyIBored() function at your will and change the follow arg in it:

1. pModuleBaseAddr is the address of your target so.
2. target_offset is the offset of your hook point in the target so.
3. is_target_thumb shows the hook point's CPU mode. You can know this information in the work of reversing before the hook work.

EvilHookStubFunctionForIBored function is the thing you really wanna do when the hook works. You can name at your will, but keep the arg (pt_regs *regs). It brings you the power to control the registers, like set r0 to 0x333 : regs->uregs[0]=0x333;.

After you finish the args above, just ndk-build and you will get your .so file.

Example

I've make some examples in other repo, it includes code and the target APK file.

1. thumb-2 example
2. arm32 example

Contact

I believe that this project still has some problems. If you find some bugs or have some problems, you can send e-mail to gtoad1994@aliyun.com. I wish we can fix it together!

Reference

Game Security Lab of Tencent

Ele7enxxh's Blog