Dynamic Analysis with Frida

Frida is a dynamic instrumentation toolkit. It injects a JavaScript engine into a running app, letting you inspect and modify behavior at runtime, without recompiling.

It is the most important tool for dynamic mobile pentesting.

Frida runs a small agent (the frida-server on the device) and a client on your machine. You write JavaScript that hooks into functions of the target process.

Your scripts can read arguments, change return values, and call methods directly.