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Snapshot data also include important metadata that will help restructure the hundreds or thousands of routines compiled in an AOT snapshot. That includes data elements such as pooled strings or arrays of immediate values.

The XxxSnapshotData symbols point to Dart VM structures and objects that will be accessed by the executing code. However, getting a starting point when dealing with stripped or obfuscated binaries may prove difficult. The XxxSnapshotInstructions symbols point to pre-compiled machine code.

Since Dart may be used outside of Flutter, or since the file name or location may change, a reliable way to locate such files is to look for an ELF so exporting the following 4 symbols: _kDartVmSnapshotInstructions The plugin supports AOT snapshots compiled with Dart version 2.10 to 2.17.Ī snapshot is generally located in the lib//libapp.so files of an APK. The AOT snapshot contains a state of the Dart VM required to run the pre-compiled code. Release-mode Flutter-based Android apps will generate AOT snapshots instead of shipping with bytecode or Dart code, like Debug-mode apps may choose to.

A common use case for it may be to offer directions when reverse engineering Flutter apps compiled for Android x86/圆4 or arm/aarch64 platforms. JEB 4.17 ships with a Dart AOT (ahead-of-time) binary snapshot helper plugin to help with the analysis of pre-compiled Dart programs. A “Dart AOT Snapshot” unit generated by the plugin (JEB >= 4.20), along with unit documents.

Update: Oct 5 2022: starting with JEB 4.20, this plugin generates IDartAotUnit objects, easily accessible by API. Reversing an Android app Protector, Part 2 – Assets and Code Encryption.Reversing an Android app Protector, Part 3 – Code Virtualization.JEB’s GENDEC IR Emulation for Auto-Decryption of Data Items.Dart AOT snapshot helper plugin to better analyze Flutter-based apps.