Doldrums is a reverse engineering tool for Flutter apps targetting Android. Concretely, it is a parser and information extractor for the Flutter/Dart Android binary, conventionally named libapp.so, for all Dart version 2.10 releases. When run, it outputs a full dump of all classes present in the isolate snapshot.
The tool is currently in beta, and missing some deserialization routines and class information. If it does not work out-of-the-box, please let me know.
Dependencies
Doldrums requires pyelftools to parse the ELF format. You can install it with
pip3 install pyelftools
Usage
To use, simply run the following command, substituting libapp.so for the appropriate binary, and output for the desired output file. Note that the verbose option only works for Dart snapshot v2.12.
python3 src/main.py [-v] libapp.so output
The expected output is a dump of all classes, in the following format:
class MyApp extends StatelessWidget {
Widget build(DynamicType, DynamicType) {
Code at absolute offset: 0xec85c
}
String myPrint(DynamicType, DynamicType) {
Code at absolute offset: 0xeca80
}
}
The absolute code offset indicates the offset into the libapp.so file where the native function may be found.
What Are Bash Comments? In Bash scripting, comments are notes in your code that the…
When you write a Bash script in Linux, you want it to run correctly every…
Introduction If you’re new to Bash scripting, one of the first skills you’ll need is…
What is Bash Scripting? Bash scripting allows you to save multiple Linux commands in a file and…
When it comes to automating tasks on Linux, Bash scripting is an essential skill for both beginners…
Learn how to create and use Bash functions with this complete tutorial. Includes syntax, arguments,…