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166 lines
7.3 KiB
Markdown
166 lines
7.3 KiB
Markdown
# Frida Tutorial 1
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<details>
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<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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<figure><img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt=""><figcaption></figcaption></figure>
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If you are interested in **hacking carer** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).
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{% embed url="https://www.stmcyber.com/careers" %}
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**From**: [https://medium.com/infosec-adventures/introduction-to-frida-5a3f51595ca1](https://medium.com/infosec-adventures/introduction-to-frida-5a3f51595ca1)\
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**APK**: [https://github.com/t0thkr1s/frida-demo/releases](https://github.com/t0thkr1s/frida-demo/releases)\
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**Source Code**: [https://github.com/t0thkr1s/frida-demo](https://github.com/t0thkr1s/frida-demo)
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## Python
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Frida allows you to **insert JavaScript code** inside functions of a running application. But you can use **python** to **call** the hooks and even to **interact** with the **hooks**.
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This is a easy python script that you can use with all the proposed examples in this tutorial:
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```python
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#hooking.py
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import frida, sys
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with open(sys.argv[1], 'r') as f:
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jscode = f.read()
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process = frida.get_usb_device().attach('infosecadventures.fridademo')
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script = process.create_script(jscode)
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print('[ * ] Running Frida Demo application')
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script.load()
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sys.stdin.read()
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```
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Call the script:
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```bash
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python hooking.py <hookN.js>
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```
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It is useful to know how to use python with frida, but for this examples you could also call directly Frida using command line frida tools:
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```
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frida -U --no-pause -l hookN.js -f infosecadventures.fridademo
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```
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## Hook 1 - Boolean Bypass
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Here you can see how to **hook** a **boolean** method (_checkPin_) from the class: _infosecadventures.fridademo.utils.PinUtil_
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```javascript
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//hook1.js
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Java.perform(function() {
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console.log("[ * ] Starting implementation override...")
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var MainActivity = Java.use("infosecadventures.fridademo.utils.PinUtil");
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MainActivity.checkPin.implementation = function(pin){
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console.log("[ + ] PIN check successfully bypassed!")
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return true;
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}
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});
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```
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```
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python hooking.py hook1.js
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```
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Mirar: La funcion recibe como parametro un String, no hace falta overload?
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## Hook 2 - Function Bruteforce
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### Non-Static Function
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If you want to call a non-static function of a class, you **first need a instance** of that class. Then, you can use that instance to call the function.\
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To do so, you could **find and existing instance** and use it:
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```javascript
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Java.perform(function() {
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console.log("[ * ] Starting PIN Brute-force, please wait...");
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Java.choose("infosecadventures.fridademo.utils.PinUtil", {
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onMatch: function(instance) {
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console.log("[ * ] Instance found in memory: " + instance);
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for(var i = 1000; i < 9999; i++){
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if(instance.checkPin(i + "") == true){
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console.log("[ + ] Found correct PIN: " + i);
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break;
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}
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}
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},
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onComplete: function() { }
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});
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});
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```
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In this case this is not working as there isn't any instance and the function is Static
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### Static Function
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If the function is static, you could just call it:
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```javascript
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//hook2.js
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Java.perform(function () {
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console.log("[ * ] Starting PIN Brute-force, please wait...")
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var PinUtil = Java.use("infosecadventures.fridademo.utils.PinUtil");
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for(var i=1000; i < 9999; i++)
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{
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if(PinUtil.checkPin(i+"") == true){
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console.log("[ + ] Found correct PIN: " + i);
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}
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}
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});
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```
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## Hook 3 - Retrieving arguments and return value
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You could hook a function and make it **print** the value of the **passed arguments** and the value of the **return value:**
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```javascript
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//hook3.js
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Java.perform(function() {
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console.log("[ * ] Starting implementation override...")
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var EncryptionUtil = Java.use("infosecadventures.fridademo.utils.EncryptionUtil");
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EncryptionUtil.encrypt.implementation = function(key, value){
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console.log("Key: " + key);
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console.log("Value: " + value);
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var encrypted_ret = this.encrypt(key, value); //Call the original function
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console.log("Encrypted value: " + encrypted_ret);
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return encrypted_ret;
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}
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});
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```
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## Important
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In this tutorial you have hooked methods using the name of the mathod and _.implementation_. But if there were **more than one method** with the same name, you will need to **specify the method** that you want to hook **indicating the type of the arguments**.
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You can see that in [the next tutorial](frida-tutorial-2.md).
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<figure><img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt=""><figcaption></figcaption></figure>
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If you are interested in **hacking carer** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).
|
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{% embed url="https://www.stmcyber.com/careers" %}
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<details>
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<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
|
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|
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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