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)
• Android 7.0(API 24)
• Android 7.1(API 25)
• Android 8.0(API 26)

ChangeLog

Basically, VirtualHook makes the following changes to the upstream:

• Inject YAHFA when the app is started: https://github.com/rk700/VirtualHook/commit/5c530eeb241ba4ff5a3d34831b5c9af21ae4b0d8
• Use MSHook instead of GodinHook: https://github.com/rk700/VirtualHook/commit/6ab8078d24e25d724b7d20b990f8589d02e8429c
• Remove Admob and Flurry
• Install hooks manually instead of loading them from sdcard automatically: https://github.com/rk700/VirtualHook/commit/a95ba5184c22d3e91953ff603f47e8955c7c4c49
• Do preopt when installing plugins: https://github.com/rk700/VirtualHook/commit/c444f5e7c8c6628a498e16a56969c7e160ff6cb0

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.

Usage

• Write and build a hook plugin APK. You can take a look at the demoHookPlugin module for reference. Don't forget to put following meta-data in AndroidManifest.xml:

    <application
        android:label="@string/app_name">
        <meta-data
            android:name="yahfa.hook.plugin"
            android:value="true"
        />
    </application>

• Push the plugin APK to sdcard
• Run VirtualHook and click the Add button
• Swipe to the 'APPS IN SDCARD' page. Then select and add hook plugins which are displayed with an icon
• Add and run non-plugin apps

Example Hook Plugins

• CertUnpinning: HTTPS certificate unpinning.
• ChangePhoneInfo: Change device information.
• VirtualHosts: Custom hostname resolution.