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VirtualHook

Introduction

VirtualHook is a tool for hooking application without root permission. It is based on two projects:

  • VirtualApp. It's a plugin framework which allows running applications in its virtual space.
  • YAHFA. It's a hook framework for ART which allows hooking Java method of the application.

Currently VirtualHook supports:

  • Android 5.0(API 21)
  • Android 5.1(API 22)
  • Android 6.0(API 23)
  • EXPERIMENTAL Android 7.0(API 24)
  • EXPERIMENTAL Android 7.1(API 25)

Build

Import and build the project in Android Studio(with Instant Run disabled). There are four modules:

  • app. This is the VirtualApp application module.
  • lib. This is the VirtualApp library module.
  • YAHFA. This is the YAHFA hook module.
  • demoHookPlugin. This is a demo hook plugin which compiles to an APK.

Hooking Native Methods

VirtualApp comes with native method hooking ability in the first place, which is done with the following function:

namespace Cydia{
    void MSHookFunction(void *symbol, void *replace, void **result);
}

To utilize that, you can use dlsym() to find the symbol and then hook your targets. Here's a demo which hooks __system_property_get.

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Unity .apk hooking demo based on VirtualApp

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