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Android APK Checklist
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Learn Android fundamentals
Static Analysis
- Check for the use of obfuscation, checks for noting if the mobile was rooted, if an emulator is being used and anti-tampering checks. Read this for more info.
- Sensitive applications (like bank apps) should check if the mobile is rooted and should actuate in consequence.
- Search for interesting strings (passwords, URLs, API, encryption, backdoors, tokens, Bluetooth uuids...).
- Special attention to firebase APIs.
- Read the manifest:
- Check if the application is in debug mode and try to "exploit" it
- Check if the APK allows backups
- Exported Activities
- Content Providers
- Exposed services
- Broadcast Receivers
- URL Schemes
- Is the application saving data insecurely internally or externally?
- Is there any password hard coded or saved in disk? Is the app using insecurely crypto algorithms?
- All the libraries compiled using the PIE flag?
- Don't forget that there is a bunch of static Android Analyzers that can help you a lot during this phase.
Dynamic Analysis
- Prepare the environment (online, local VM or physical)
- Is there any unintended data leakage (logging, copy/paste, crash logs)?
- Confidential information being saved in SQLite dbs?
- Exploitable exposed Activities?
- Exploitable Content Providers?
- Exploitable exposed Services?
- Exploitable Broadcast Receivers?
- Is the application transmitting information in clear text/using weak algorithms? is a MitM possible?
- Inspect HTTP/HTTPS traffic
- This one is really important, because if you can capture the HTTP traffic you can search for common Web vulnerabilities (Hacktricks has a lot of information about Web vulns).
- Check for possible Android Client Side Injections (probably some static code analysis will help here)
- Frida: Just Frida, use it to obtain interesting dynamic data from the application (maybe some passwords...)