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BinderHook

Library intended to hook Binder interface and manipulate events

Table of Contents

This library helps to hook binder communication between your App process and system services of Android.

Just include the maven repository

  1. In your root build.gradle:
allprojects {
        repositories {
            [..]
            jcenter()
            maven { url "https://jitpack.io" }
        }
   }
  1. In your library/build.gradle add:
   dependencies {
        implementation 'com.github.ChickenHook:BinderHook:3.0'
        implementation 'com.github.ChickenHook:RestrictionBypass:2.2'
   }

This chapter showcases how to use this hooking library. Also please have a look at MainActivity.kt, MainActivityTest.kt and ServiceHooksTest.java

Package Manager

Please check AIDL Implementation in order to learn parcel encode / decode instructions

        ServiceHooks.hookPackageManager(packageManager, object :
            OnBinderListener() {

            val DESCRIPTOR = "android.content.pm.IPackageManager"

            override fun transact(
                originalBinder: IBinder,
                code: Int,
                data: Parcel,
                reply: Parcel?,
                flags: Int
            ): Boolean {

                if (code == 193) { // setHarmfulAppWarning
                    log("Manipulate setHarmfulAppWarning")
                    data.setDataPosition(0)
                    val _data = Parcel.obtain()
                    _data.writeInterfaceToken(DESCRIPTOR)
                    data.writeInterfaceToken(DESCRIPTOR)
                    val packageName = data.readString()
                    _data.writeString(packageName)

                    var message: CharSequence?
                    if (data.readInt() != 0) {
                        message = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(data)
                        _data.writeInt(1)
                        TextUtils.writeToParcel(message, _data, 0)
                    } else {
                        _data.writeInt(0)
                        message = null
                    }

                    val _flags = data.readInt()
                    _data.writeInt(1)
                    return originalBinder.transact(code, _data, reply, Binder.FLAG_ONEWAY)

                }

                if (code == 56) { // get installed packages


                    // try to manipulate this call
                    val _data = Parcel.obtain()
                    _data.writeInterfaceToken(DESCRIPTOR)
                    _data.writeInt(0)
                    _data.writeInt(0) // simulate system user?
                    return originalBinder.transact(code, _data, reply, flags)
                }

                return originalBinder.transact(code, data, reply, flags)
            }
        })

ActivityManager

Please check AIDL Implementation in order to learn parcel encode / decode instructions

        ServiceHooks.hookActivityManager(object :
            OnBinderListener() {
            val DESCRIPTOR = "android.app.IActivityManager"
            override fun transact(
                originalBinder: IBinder,
                code: Int,
                data: Parcel,
                reply: Parcel?,
                flags: Int
            ): Boolean {
                if (code == 6) {// start activity
                    return startActivityHook(
                        originalBinder,
                        code,
                        data,
                        reply,
                        flags,
                        DESCRIPTOR
                    )
                }
                return originalBinder.transact(code, data, reply, flags)
            }
        })

ActivityTaskManager

Please check AIDL Implementation in order to learn parcel encode / decode instructions

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
            ServiceHooks.hookActivityTaskManager(object :
                OnBinderListener() {
                val DESCRIPTOR = "android.app.IActivityTaskManager"

                override fun transact(
                    originalBinder: IBinder,
                    code: Int,
                    data: Parcel,
                    reply: Parcel?,
                    flags: Int
                ): Boolean {

                    if (code == 1) { // start activity
                        return startActivityHook(
                            originalBinder,
                            code,
                            data,
                            reply,
                            flags,
                            DESCRIPTOR
                        )
                    }

                    return originalBinder.transact(code, data, reply, flags)
                }
            })

WindowManager

Please check AIDL Implementation in order to learn parcel encode / decode instructions

        ServiceHooks.hookWindowManager(object :
            OnBinderListener() {
            override fun transact(
                originalBinder: IBinder,
                code: Int,
                data: Parcel,
                reply: Parcel?,
                flags: Int
            ): Boolean {
                return originalBinder.transact(code, data, reply, flags)
            }
        })

Other services

A lot of other service hooks are also present. However some are missing and will come in future releases.

Service Name ImplementationStatus
ContentResolver OK
NotificationManager OK
ActivityManager OK
AppOpsManager OK
PackageManager OK
WindowManager OK
ActivityTaskManager OK
AlarmManager WIP
WallpaperManager WIP
RoleService WIP
CameraService WIP
PrintService WIP
TrustService WIP
UsageStatsService WIP
... Feel free to submit feature requests if you need more services

If you just wanna change some args and not manipulate Parcel directly you can use ProxyListener:

        ServiceHooks.hookActivityManager(new ProxyListener() {
            @Override
            public Object invoke(Object orig, Object proxy, Method method, Object[] args) throws Throwable {
                if (method.getName().equals("startActivity") && args.length == 10) {
                    args[args.length - 3] = ((int) args[args.length - 3]) |
                            START_FLAG_DEBUG |
                            START_FLAG_TRACK_ALLOCATION |
                            START_FLAG_NATIVE_DEBUGGING;
                }
                return method.invoke(orig, args);
            }
        });

By adding these lines of code you can enable the verbose mode

        ProxyHook.VERBOSE = true

This will create output like:

2020-05-03 22:03:40.309 25785-25785/org.chickenhook.chickenbinder I/BinderHook: ProxyHook [+] trace [+]
    java.lang.Exception: Trace
        at org.chickenhook.binderhooks.ProxyHook.doStackTrace(ProxyHook.java:128)
        at org.chickenhook.binderhooks.ProxyHook$FakeBinder.transact(ProxyHook.java:111)
        at android.content.pm.IPackageManager$Stub$Proxy.setHarmfulAppWarning(IPackageManager.java:8654)
        at android.app.ApplicationPackageManager.setHarmfulAppWarning(ApplicationPackageManager.java:3234)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.chickenhook.chickenbinder.MainActivity$onCreate$$inlined$apply$lambda$1.onClick(MainActivity.kt:40)
        at android.view.View.performClick(View.java:7356)
        at android.view.View.performClickInternal(View.java:7333)
        at android.view.View.access$3600(View.java:807)
        at android.view.View$PerformClick.run(View.java:28200)
        at android.os.Handler.handleCallback(Handler.java:907)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7476)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:939)

and

2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/chickenbinder: dump parcel <0x7444767700>
2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/chickenbinder: ---------------------------------------------------------------------------------------------------------------------------------------------
2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/parcel: HEX (76 bytes):
2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/parcel: 04:00:00:C2:FF:FF:FF:FF:1C:00:00:00:61:00:6E:00:64:00:72:00:6F:00:69:00:64:00:2E:00:61:00:70:00:70:00:2E:00:49:00:41:00:63:00:74:00:69:00:76:00:69:00
2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/parcel: 74:00:79:00:4D:00:61:00:6E:00:61:00:67:00:65:00:72:00:00:00:00:00:61:13:00:00
2020-05-07 10:44:55.603 4911-4911/org.chickenhook.chickenbinder D/chickenbinder: ---------------------------------------------------------------------------------------------------------------------------------------------

for any transaction that went through your installed binder hook.

In order to work with existing parcels and be able to modify also restricted content like flattened Binder objects (aka writeStrongBinder, readStrongBinder) we added some low level edit functions.

dump

This function dumps the content of the parcel as hexdump to logcat

                    ParcelEditor.dump(parcel);

write

Write a bunch of bites at the given offset

                    byte[] bytes = new byte[]{
                            1, 2, 3
                    };
                    ParcelEditor.write(parcel, 0, bytes);

read

Read a bunch of bytes from the given offset

                    byte[] content = ParcelEditor.read(parcel, 0, parcel.dataSize());

Please create a bug report if you find any issues. This chapter will be updated then.

Project Description
ChickenHook A linux / android / MacOS hooking framework
BinderHook Library intended to hook Binder interface and manipulate events
RestrictionBypass Android API restriction bypass for all Android Versions
AndroidManifestBypass Android API restriction bypass for all Android Versions
..

Sponsor

If you're happy with my library please order me a cup of coffee ;) Thanks.

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