# Drozer Tutorial

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## APKs to test

* [Sieve](https://github.com/mwrlabs/drozer/releases/download/2.3.4/sieve.apk) (from mrwlabs)
* [DIVA](https://payatu.com/wp-content/uploads/2016/01/diva-beta.tar.gz)

**Parts of this tutorial were extracted from the** [**Drozer documentation pdf**](https://labs.withsecure.com/content/dam/labs/docs/mwri-drozer-user-guide-2015-03-23.pdf)**.**

## Installation

Install Drozer Client inside your host. Download it from the [latest releases](https://github.com/mwrlabs/drozer/releases).

```bash
pip install drozer-2.4.4-py2-none-any.whl
pip install twisted
pip install service_identity
```

Download and install drozer APK from the [latest releases](https://github.com/mwrlabs/drozer/releases). At this moment it is [this](https://github.com/mwrlabs/drozer/releases/download/2.3.4/drozer-agent-2.3.4.apk).

```bash
adb install drozer.apk
```

### Starting the Server

Agent is running on port 31415, we need to [port forward](https://en.wikipedia.org/wiki/Port_forwarding) to establish the communication between the Drozer Client and Agent, here is the command to do so:

```bash
adb forward tcp:31415 tcp:31415
```

Finally, **launch** the **application** and press the bottom "**ON**"

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-ab1786558a7b9d62724edd85419268e3c891bad5%2Fimage%20\(459\).png?alt=media)

And connect to it:

```bash
drozer console connect
```

## Interesting Commands

| **Commands**    | **Description**                                                                                                                                        |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Help MODULE** | Shows help of the selected module                                                                                                                      |
| **list**        | Shows a list of all drozer modules that can be executed in the current session. This hides modules that you don’t have appropriate permissions to run. |
| **shell**       | Start an interactive Linux shell on the device, in the context of the Agent.                                                                           |
| **clean**       | Remove temporary files stored by drozer on the Android device.                                                                                         |
| **load**        | Load a file containing drozer commands and execute them in sequence.                                                                                   |
| **module**      | Find and install additional drozer modules from the Internet.                                                                                          |
| **unset**       | Remove a named variable that drozer passes to any Linux shells that it spawns.                                                                         |
| **set**         | Stores a value in a variable that will be passed as an environmental variable to any Linux shells spawned by drozer.                                   |
| **shell**       | Start an interactive Linux shell on the device, in the context of the Agent                                                                            |
| **run MODULE**  | Execute a drozer module                                                                                                                                |
| **exploit**     | Drozer can create exploits to execute in the decide. `drozer exploit list`                                                                             |
| **payload**     | The exploits need a payload. `drozer payload list`                                                                                                     |

### Package

Find the **name** of the package filtering by part of the name:

```bash
dz> run app.package.list -f sieve  
com.mwr.example.sieve
```

**Basic Information** of the package:

```bash
dz> run app.package.info -a com.mwr.example.sieve
Package: com.mwr.example.sieve
Process Name: com.mwr.example.sieve
Version: 1.0
Data Directory: /data/data/com.mwr.example.sieve
APK Path: /data/app/com.mwr.example.sieve-2.apk
UID: 10056
GID: [1028, 1015, 3003]
Shared Libraries: null
Shared User ID: null
Uses Permissions:
 - android.permission.READ_EXTERNAL_STORAGE
 - android.permission.WRITE_EXTERNAL_STORAGE
 - android.permission.INTERNET
Defines Permissions:
 - com.mwr.example.sieve.READ_KEYS
 - com.mwr.example.sieve.WRITE_KEYS
```

Read **Manifest**:

```bash
run app.package.manifest jakhar.aseem.diva
```

**Attack surface** of the package:

```bash
dz> run app.package.attacksurface com.mwr.example.sieve
Attack Surface:
 3 activities exported
 0 broadcast receivers exported
 2 content providers exported
 2 services exported
 is debuggable
```

* **Activities**: Maybe you can start an activity and bypass some kind of authorization that should be prevent you from launching it.
* **Content providers**: Maybe you can access private data or exploit some vulnerability (SQL Injection or Path Traversal).
* **Services**:
* **is debuggable**: [Learn more](#is-debuggeable)

### Activities

An exported activity component’s “android:exported” value is set to **“true”** in the AndroidManifest.xml file:

```markup
<activity android:name="com.my.app.Initial" android:exported="true">
</activity>
```

**List exported activities**:

```bash
dz> run app.activity.info -a com.mwr.example.sieve
Package: com.mwr.example.sieve
 com.mwr.example.sieve.FileSelectActivity
 com.mwr.example.sieve.MainLoginActivity
 com.mwr.example.sieve.PWList
```

**Start activity**:

Maybe you can start an activity and bypass some kind of authorization that should be prevent you from launching it.

{% code overflow="wrap" %}
```bash
dz> run app.activity.start --component com.mwr.example.sieve com.mwr.example.sieve.PWList
```
{% endcode %}

You can also start an exported activity from **adb**:

* PackageName is com.example.demo
* Exported ActivityName is com.example.test.MainActivity

```bash
adb shell am start -n com.example.demo/com.example.test.MainActivity
```

### Content Providers

This post was so big to be here so **you can** [**access it in its own page here**](drozer-tutorial/exploiting-content-providers).

### Services

A exported service is declared inside the Manifest.xml:

{% code overflow="wrap" %}
```markup
<service android:name=".AuthService" android:exported="true" android:process=":remote"/>
```
{% endcode %}

Inside the code **check** for the \*\*`handleMessage`\*\*function which will **receive** the **message**:

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-f20e8ce2fc518cd80eb4ba6d3cc92921b98557d8%2Fimage%20\(82\).png?alt=media)

#### List service

```bash
dz> run app.service.info -a com.mwr.example.sieve 
Package: com.mwr.example.sieve
  com.mwr.example.sieve.AuthService
    Permission: null
  com.mwr.example.sieve.CryptoService
    Permission: null
```

#### **Interact** with a service

```bash
app.service.send            Send a Message to a service, and display the reply  
app.service.start           Start Service                                       
app.service.stop            Stop Service
```

#### Example

Take a look to the **drozer** help for `app.service.send`:

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-b1c5a1a13c3d409442ea29b8a82310be8e29b742%2Fimage%20\(1079\).png?alt=media)

Note that you will be sending first the data inside "_msg.what_", then "_msg.arg1_" and "_msg.arg2_", you should check inside the code **which information is being used** and where.\
Using the `--extra` option you can send something interpreted by "_msg.replyTo"_, and using `--bundle-as-obj` you create and object with the provided details.

In the following example:

* `what == 2354`
* `arg1 == 9234`
* `arg2 == 1`
* `replyTo == object(string com.mwr.example.sieve.PIN 1337)`

```bash
run app.service.send com.mwr.example.sieve com.mwr.example.sieve.AuthService --msg 2354 9234 1 --extra string com.mwr.example.sieve.PIN 1337 --bundle-as-obj
```

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-6046bf9a80645bab7a7591101301a9288f4783d8%2Fimage%20\(647\).png?alt=media)

### Broadcast Receivers

**In the Android basic info section you can see what is a Broadcast Receiver**.

After discovering this Broadcast Receivers you should **check the code** of them. Pay special attention to the **`onReceive`** function as it will be handling the messages received.

#### **Detect all** broadcast receivers

```bash
run app.broadcast.info #Detects all
```

#### Check broadcast receivers of an app

```bash
#Check one negative
run app.broadcast.info -a jakhar.aseem.diva
Package: jakhar.aseem.diva
  No matching receivers.

# Check one positive
run app.broadcast.info -a com.google.android.youtube
Package: com.google.android.youtube
  com.google.android.libraries.youtube.player.PlayerUiModule$LegacyMediaButtonIntentReceiver
    Permission: null
  com.google.android.apps.youtube.app.common.notification.GcmBroadcastReceiver
    Permission: com.google.android.c2dm.permission.SEND
  com.google.android.apps.youtube.app.PackageReplacedReceiver
    Permission: null
  com.google.android.libraries.youtube.account.AccountsChangedReceiver
    Permission: null
  com.google.android.apps.youtube.app.application.system.LocaleUpdatedReceiver
    Permission: null
```

#### Broadcast **Interactions**

```bash
app.broadcast.info          Get information about broadcast receivers           
app.broadcast.send          Send broadcast using an intent                      
app.broadcast.sniff         Register a broadcast receiver that can sniff particular intents
```

#### Send a message

In this example abusing the [FourGoats apk](https://github.com/linkedin/qark/blob/master/tests/goatdroid.apk) Content Provider you can **send an arbitrary SMS** any non-premium destination **without asking** the user for permission.

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-deb8d0d388e9fdc2f306cc84d13e3b79c623ac01%2Fimage%20\(415\).png?alt=media)

![](https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-9fe1e166755bb71fc118787b447a1445b53eb4fd%2Fimage%20\(573\).png?alt=media)

If you read the code, the parameters "_phoneNumber_" and "_message_" must be sent to the Content Provider.

```bash
run app.broadcast.send --action org.owasp.goatdroid.fourgoats.SOCIAL_SMS --component org.owasp.goatdroid.fourgoats.broadcastreceivers SendSMSNowReceiver --extra string phoneNumber 123456789 --extra string message "Hello mate!"
```

### Is debuggeable

A prodduction APK should never be debuggeable.\
This mean that you can **attach java debugger** to the running application, inspect it in run time, set breakpoints, go step by step, gather variable values and even change them.[ InfoSec institute has an excellent article](exploiting-a-debuggeable-applciation) on digging deeper when you application is debuggable and injecting runtime code.

When an application is debuggable, it will appear in the Manifest:

```xml
<application theme="@2131296387" debuggable="true"
```

You can find all debuggeable applications with **Drozer**:

```bash
run app.package.debuggable
```

## Tutorials

* [https://resources.infosecinstitute.com/android-penetration-tools-walkthrough-series-drozer/#gref](https://resources.infosecinstitute.com/android-penetration-tools-walkthrough-series-drozer/#gref)
* [https://github.com/mgcfish/mobiletools/blob/master/\_posts/2016-08-01-Using-Drozer-for-application-security-assessments.md](https://github.com/mgcfish/mobiletools/blob/master/_posts/2016-08-01-Using-Drozer-for-application-security-assessments.md)
* [https://www.hackingarticles.in/android-penetration-testing-drozer/](https://www.hackingarticles.in/android-penetration-testing-drozer/)
* [https://medium.com/@ashrafrizvi3006/how-to-test-android-application-security-using-drozer-edc002c5dcac](https://medium.com/@ashrafrizvi3006/how-to-test-android-application-security-using-drozer-edc002c5dcac)

## More info

* [https://blog.dixitaditya.com/android-pentesting-cheatsheet/](https://blog.dixitaditya.com/android-pentesting-cheatsheet/)

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