This is a proof-of-concept(PoC) project on detecting hooks in Android's PackageManagerService(PMS). PMS hook is a common way to bypass signature checks on Android apks.

The PoC comprises of two parts:

• Ported a typical PMS hook from MT Manager(binmt.cc) and replaced the default Application class in manifests
• Implemented PMS hook detection methods in both Java and native layers

• Detect hook in ActivityThread in Java
• Detect hook in ApplicationContext in Java
• Detect hook in ActivityThread in native
• Detect hook in ApplicationContext in native
• Recover PMS instance after hooking

1. Download Android Studio
2. Launch Android Studio.
3. Open the sample directory.
4. Open File/Project Structure..., click Download or Select NDK location.
5. Click Tools/Android/Sync Project with Gradle Files.
6. Click Run/Run 'app'.

http://weishu.me/2016/03/07/understand-plugin-framework-ams-pms-hook/