example.md

platform	title	tools	code
android	File Tracing	frida-trace	kotlin

Sample

The snippet below shows sample code that creates a file in external storage. You can put this code into your app and follow the steps to see a sample usage of frida-trace to identify a potential data leak.

{{ snippet.kt }}

Steps

Execute frida-trace against the sample app to trace all usage of file IO.

{{ run.sh }}

Observation

frida-trace has identified one file path in the external storage that the app opened.

{{ output.txt }}

Evaluation

Review each of the reported instances by manually opening a file and inspecting its content.

NOTE: If you want to test more file locations than only the file locations inside the external storage, remove grep from the script.