Android app protection hides business code despite successful decompilation

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A reverse-engineering analysis of an APK protected by XopProtector revealed that standard decompilation tools could not expose the application's core business logic. While the APK could be unpacked and its manifest read, the main classes.dex file contained only the protection shell's startup code, not the original application. The business logic was found to be encrypted and stored separately in a non-standard archive file within the assets folder. This demonstrates that successful decompilation of an APK's shell does not guarantee access to the protected application code within.

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