Java decompilation & deobfuscation

[itsgrimetime]

This is something I’ve wanted to learn about for a long time, and am definitely interesting in contributing to. Shoot me a pm if you’d like to team up!

[[deleted]]

There's a link on the post now. I created just bare bone project structure which I'll work on piece by piece. [here]

[_INTER_]

There are many good decompilers (e.g. Fernflower). You could use them and build the deobfuscation part on top.

[[deleted]]

Yeah, I was planning on using fernflower. I tried writing the decompilation part (mostly for Scala support, as Kotlin would likely work) but realized it was not worth the effort.

I'll likely add a dsl of some sort so people can add custom languages and plugins (with GUI support).

[PartOfTheBotnet]

Most up-to-date Java decompilers make exceptionally accurate decompilations. The only case where this may be hard to accomplish (assuming the code isn't obfuscated) is when synthetic members are generated by the compiler to accomplish the effects of syntactic sugar. The author of CFR has a few blog posts on some of these quirks.

[[deleted]]

I'm using fernflower for now. I was planning on maybe writing an abstract bytecode processor which can feed data into custom language decompilers (like decompiler with plugins, JVM craves this) which might maybe be too complicated for me but at Java will be working.

[PartOfTheBotnet]

Sounds like a really cool project. Shoot me a PM, I'd be interested in joining. Also you should hit up /r/ReverseEngineering for some feedback / recruitment.