# Frida Tutorial

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## Instalação

Instale **frida tools**:
```bash
pip install frida-tools
pip install frida
```
**Baixe e instale** no Android o **frida server** ([Baixe a versão mais recente](https://github.com/frida/frida/releases)).\
Um comando para reiniciar o adb em modo root, conectar-se a ele, fazer upload do frida-server, dar permissões de execução e executá-lo em segundo plano: 

{% code overflow="wrap" %}
```bash
adb root; adb connect localhost:6000; sleep 1; adb push frida-server /data/local/tmp/; adb shell "chmod 755 /data/local/tmp/frida-server"; adb shell "/data/local/tmp/frida-server &"
```
{% endcode %}

**Verifique** se está **funcionando**:
```bash
frida-ps -U #List packages and processes
frida-ps -U | grep -i <part_of_the_package_name> #Get all the package name
```
## Tutoriais

### [Tutorial 1](frida-tutorial-1.md)

**De**: [https://medium.com/infosec-adventures/introduction-to-frida-5a3f51595ca1](https://medium.com/infosec-adventures/introduction-to-frida-5a3f51595ca1)\
**APK**: [https://github.com/t0thkr1s/frida-demo/releases](https://github.com/t0thkr1s/frida-demo/releases)\
**Código Fonte**: [https://github.com/t0thkr1s/frida-demo](https://github.com/t0thkr1s/frida-demo)

**Siga o [link para ler](frida-tutorial-1.md).**

### [Tutorial 2](frida-tutorial-2.md)

**De**: [https://11x256.github.io/Frida-hooking-android-part-2/](https://11x256.github.io/Frida-hooking-android-part-2/) (Partes 2, 3 & 4)\
**APKs e Código fonte**: [https://github.com/11x256/frida-android-examples](https://github.com/11x256/frida-android-examples)

**Siga o [link para ler.](frida-tutorial-2.md)**

### [Tutorial 3](owaspuncrackable-1.md)

**De**: [https://joshspicer.com/android-frida-1](https://joshspicer.com/android-frida-1)\
**APK**: [https://github.com/OWASP/owasp-mstg/blob/master/Crackmes/Android/Level\_01/UnCrackable-Level1.apk](https://github.com/OWASP/owasp-mstg/blob/master/Crackmes/Android/Level\_01/UnCrackable-Level1.apk)

**Siga o [link para ler](owaspuncrackable-1.md).**

**Você pode encontrar mais scripts incríveis do Frida aqui:** [**https://codeshare.frida.re/**](https://codeshare.frida.re)

## Exemplos Rápidos

### Chamando o Frida a partir da linha de comando
```bash
frida-ps -U

#Basic frida hooking
frida -l disableRoot.js -f owasp.mstg.uncrackable1

#Hooking before starting the app
frida -U --no-pause -l disableRoot.js -f owasp.mstg.uncrackable1
#The --no-pause and -f options allow the app to be spawned automatically,
#frozen so that the instrumentation can occur, and the automatically
#continue execution with our modified code.
```
### Script Básico em Python
```python
import frida, sys

jscode = open(sys.argv[0]).read()
process = frida.get_usb_device().attach('infosecadventures.fridademo')
script = process.create_script(jscode)
print('[ * ] Running Frida Demo application')
script.load()
sys.stdin.read()
```
### Hooking functions without parameters

Hook a função `a()` da classe `sg.vantagepoint.a.c`
```javascript
Java.perform(function () {
;  rootcheck1.a.overload().implementation = function() {
rootcheck1.a.overload().implementation = function() {
send("sg.vantagepoint.a.c.a()Z   Root check 1 HIT!  su.exists()");
return false;
};
});
```
Hook java `exit()`
```javascript
var sysexit = Java.use("java.lang.System");
sysexit.exit.overload("int").implementation = function(var_0) {
send("java.lang.System.exit(I)V  // We avoid exiting the application  :)");
};
```
Hook MainActivity `.onStart()` & `.onCreate()`
```javascript
var mainactivity = Java.use("sg.vantagepoint.uncrackable1.MainActivity");
mainactivity.onStart.overload().implementation = function() {
send("MainActivity.onStart() HIT!!!");
var ret = this.onStart.overload().call(this);
};
mainactivity.onCreate.overload("android.os.Bundle").implementation = function(var_0) {
send("MainActivity.onCreate() HIT!!!");
var ret = this.onCreate.overload("android.os.Bundle").call(this,var_0);
};
```
Hook android `.onCreate()`
```javascript
var activity = Java.use("android.app.Activity");
activity.onCreate.overload("android.os.Bundle").implementation = function(var_0) {
send("Activity HIT!!!");
var ret = this.onCreate.overload("android.os.Bundle").call(this,var_0);
};
```
### Hooking functions with parameters and retrieving the value

Hooking uma função de decriptação. Imprima a entrada, chame a função original para decriptar a entrada e, finalmente, imprima os dados em texto claro:
```javascript
function getString(data){
var ret = "";
for (var i=0; i < data.length; i++){
ret += data[i].toString();
}
return ret
}
var aes_decrypt = Java.use("sg.vantagepoint.a.a");
aes_decrypt.a.overload("[B","[B").implementation = function(var_0,var_1) {
send("sg.vantagepoint.a.a.a([B[B)[B   doFinal(enc)  // AES/ECB/PKCS7Padding");
send("Key       : " + getString(var_0));
send("Encrypted : " + getString(var_1));
var ret = this.a.overload("[B","[B").call(this,var_0,var_1);
send("Decrypted : " + ret);

var flag = "";
for (var i=0; i < ret.length; i++){
flag += String.fromCharCode(ret[i]);
}
send("Decrypted flag: " + flag);
return ret; //[B
};
```
### Hooking functions and calling them with our input

Hook uma função que recebe uma string e chame-a com outra string (de [aqui](https://11x256.github.io/Frida-hooking-android-part-2/))
```javascript
var string_class = Java.use("java.lang.String"); // get a JS wrapper for java's String class

my_class.fun.overload("java.lang.String").implementation = function(x){ //hooking the new function
var my_string = string_class.$new("My TeSt String#####"); //creating a new String by using `new` operator
console.log("Original arg: " +x );
var ret =  this.fun(my_string); // calling the original function with the new String, and putting its return value in ret variable
console.log("Return value: "+ret);
return ret;
};
```
### Obtendo um objeto já criado de uma classe

Se você quiser extrair algum atributo de um objeto criado, pode usar isso.

Neste exemplo, você verá como obter o objeto da classe my\_activity e como chamar a função .secret() que imprimirá um atributo privado do objeto:
```javascript
Java.choose("com.example.a11x256.frida_test.my_activity" , {
onMatch : function(instance){ //This function will be called for every instance found by frida
console.log("Found instance: "+instance);
console.log("Result of secret func: " + instance.secret());
},
onComplete:function(){}
});
```
## Outros tutoriais Frida

* [https://github.com/DERE-ad2001/Frida-Labs](https://github.com/DERE-ad2001/Frida-Labs)
* [Parte 1 da série de blogs sobre Uso Avançado do Frida: Bibliotecas de Criptografia IOS](https://8ksec.io/advanced-frida-usage-part-1-ios-encryption-libraries-8ksec-blogs/)

<figure><img src="../../../.gitbook/assets/i3.png" alt=""><figcaption></figcaption></figure>

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