Frida is a dynamic binary instrumentation toolkit that allows us to execute scripts in previously locked down software. It is very much necessary for android challenges as it even allows us to write our own implementation of any function and run.
Installing Frida
We need to install frida on both our android device and our pc.
Installing on android device
First we need to check our android device architecture. Make sure that the device is connected to your system through USB(USB debugging should be on) or emulator is online Type the following command in your terminal to know the architecture of your device:
adb shell getprop ro.product.cpu.abi
This command retrieves the value of the ro.product.cpu.abi property, which indicates the CPU architecture of the device. The result will be one of the following values:
armarm64x86x86_64Now to go to https://github.com/frida/frida/releases and download the specific android release for your architecture.
Unzip the file and in the terminal go to the directory where you have the frida-server file. Now we need to push the frida-server on our device in a particular folder. Type the command:
adb push frida-server-16.1.10-android-x86 /data/local/tmp/frida-server
Please change the file frida-server-16.1.10-android-x86 according to the one you downloaded.
Now type adb shell and then cd /data/local/tmp. Then give executing permissions to the frida-server by typing chmod 700 frida-server
Run the frida-server by ./frida-server
Now we are ready to inject Frida scripts into application process.