276 lines
7.8 KiB
Markdown
276 lines
7.8 KiB
Markdown
# Objection Tutorial
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## **Introduction**
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[](https://github.com/sensepost/objection)
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**objection - Runtime Mobile Exploration**
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`objection` is a runtime mobile exploration toolkit, powered by [Frida](https://www.frida.re/). It was built with the aim of helping assess mobile applications and their security posture without the need for a jailbroken or rooted mobile device.
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**Note:** This is not some form of jailbreak / root bypass. By using `objection`, you are still limited by all of the restrictions imposed by the applicable sandbox you are facing.
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### Resume
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The **goal** of **objection** is let the user call the **main actions that offers Frida**. **Otherwise**, the user will need to create a **single script for every application** that he wants to test.
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## Tutorial
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For this tutorial I am going to use the APK that you can download here:
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{% file src="../../../.gitbook/assets/app-release.zip" %}
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Or from its [original repository ](https://github.com/asvid/FridaApp)\(download app-release.apk\)
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### Installation
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```text
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pip3 install objection
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```
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### Connection
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Make a **regular ADB conection** and **start** the **frida** server in the device \(and check that frida is working in both the client and the server\).
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If you are using a **rooted device** it is needed to select the application that you want to test inside the _**--gadget**_ option. in this case:
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```text
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objection --gadget asvid.github.io.fridaapp explore
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```
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### Basic Actions
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Not all possible commands of objections are going to be listed in this tutorial, only the ones that I have found more useful.
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#### Environment
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Some interesting information \(like passwords or paths\) could be find inside the environment.
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```text
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env
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```
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#### Frida Information
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```text
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frida
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```
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#### Upload/Download
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```text
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file download <remote path> [<local path>]
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file upload <local path> [<remote path>]
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```
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#### Import frida script
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```text
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import <local path frida-script>
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```
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#### SSLPinning
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```text
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android sslpinning disable #Attempts to disable SSL Pinning on Android devices.
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```
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#### Root detection
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```text
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android root disable #Attempts to disable root detection on Android devices.
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android root simutale #Attempts to simulate a rooted Android environment.
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```
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#### Exec Command
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```text
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android shell_exec whoami
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```
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#### Screenshots
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```text
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android ui screenshot /tmp/screenshot
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android ui FLAG_SECURE false This may enable you to take screenshots using the hardware keys
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```
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### Static analysis made Dynamic
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In a real application we should know all of the information discovered in this part before using objection thanks to **static analysis**. Anyway, this way maybe you can see **something new** as here you will only have a complete list of classes, methods and exported objects.
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This is also usefull if somehow you are **unable to get some readable source code** of the app.
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#### List activities, receivers and services
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```text
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android hooking list activities
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```
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```text
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android hooking list services
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android hooking list receivers
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```
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Frida will launch an error if none is found
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#### Getting current activity
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```text
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android hooking get current_activity
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```
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#### Search Classes
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Lets start looking for classes inside our application
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```text
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android hooking search classes asvid.github.io.fridaapp
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```
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#### Search Methods of a class
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Now lets extract the methods inside the class _MainActivity:_
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```text
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android hooking search methods asvid.github.io.fridaapp MainActivity
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```
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#### List declared Methods of a class with their parameters
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Lets figure out wich parameters does the methods of the class need:
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```text
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android hooking list class_methods asvid.github.io.fridaapp.MainActivity
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```
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#### List classes
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You could also list all the classes that were loaded inside the current applicatoin:
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```text
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android hooking list classes #List all loaded classes, As the target application gets usedmore, this command will return more classes.
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```
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This is very useful if you want to **hook the method of a class and you only know the name of the class**. You coul use this function to **search which module owns the class** and then hook its method.
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### Hooking being easy
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#### Hooking \(watching\) a method
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From the [source code](https://github.com/asvid/FridaApp/blob/master/app/src/main/java/asvid/github/io/fridaapp/MainActivity.kt) of the application we know that the **function** _**sum\(\)**_ **from** _**MainActivity**_ is being run **every second**. Lets try to **dump all possible information** each time the function is called \(arguments, return value and backtrace\):
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```text
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android hooking watch class_method asvid.github.io.fridaapp.MainActivity.sum --dump-args --dump-backtrace --dump-return
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```
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#### Hooking \(watching\) an entire class
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Actually I find all the methods of the class MainActivity really interesting, lets **hook them all**. Be careful, this could **crash** an application.
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```text
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android hooking watch class asvid.github.io.fridaapp.MainActivity --dump-args --dump-return
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```
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If you play with the application while the class is hooked you will see when **each function is being called**, its **arguments** and the **return** value.
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#### Changing boolean return value of a function
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From the source code you can see that the function _checkPin_ gets a _String_ as argument and returns a _boolean_. Lets make the function **always return true**:
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Now, If you write anything in the text box for the PIN code you will see tat anything is valid:
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### Class instances
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Search for and print **live instances of a specific Java class**, specified by a fully qualified class name. Out is the result of an attempt at getting a string value for a discovered objection which would typically **contain property values for the object**.
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```text
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android heap print_instances <class>
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```
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### Keystore/Intents
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You can play with the keystore and intents using:
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```text
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android keystore list
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android intents launch_activity
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android intent launch_service
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```
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### Memory
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#### Dump
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```text
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memory dump all <local destination> #Dump all memory
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memory dump from_base <base_address> <size_to_dump> <local_destination> #Dump a part
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```
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#### List
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```text
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memory list modules
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```
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At the bottom os the list you can see frida:
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Lets checks what is frida exporting:
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#### Search/Write
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You can alse search and write inside memory with objection:
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```text
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memory search "<pattern eg: 41 41 41 ?? 41>" (--string) (--offsets-only)
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memory write "<address>" "<pattern eg: 41 41 41 41>" (--string)
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```
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### SQLite
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You cals can use the command `sqlite` to interact with sqlite databases.
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### Exit
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```text
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exit
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```
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## What I miss in Objection
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* The hooking methods sometimes crashes the application \(this is also because of Frida\).
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* You can't use the instaces of the classes to call functions of the instance. And you can't create new instances of classes and use them to call functions.
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* There isn't a shortcut \(like the one for sslpinnin\) to hook all the common crypto methods being used by the application to see cyphered text, plain text, keys, IVs and algorithms used.
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