dex2jar
vineflower
dex2jar | vineflower | |
---|---|---|
5 | 10 | |
11,875 | 1,024 | |
- | 3.7% | |
5.0 | 8.9 | |
24 days ago | 6 days ago | |
Java | Java | |
Apache License 2.0 | Apache License 2.0 |
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dex2jar
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Understanding security in React Native applications
App tampering and repackaging can be performed by using reverse engineering or tampering tools, such as Apktool, dex2jar, etc.
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What Happens When Your Phone Is Spying on You
A week ago I purchased a bluetooth device that takes some measurements. You require an Android or iOS application. The first thing the iOS app did was request permission for your location. Immediate fired up MITMproxy [1] running in transparent `--mode wireguard` and installed it's certificate in the iOS trust store. It was sending a whole bunch of data to China and HK. Since I don't have a jailbroken iPhone, it's off to Android.
For BLE scanning, Android does require permissions for location, but this application is using a Chinese branded tracking SDK and sending encrypted (within already encrypted TLS). So it's time to start reversing and instrumenting the runtime.
Well - not so easy, they used a commercial packer that encrypts their compiled bytecode and decrypts and runs it within a C++ library. I managed to bull the Dalvik out of memory using Frida[2], covert it to java bytecode with dex2jar[3] then into decompiled java with jadx [3].
Since the developer relied on the packer to hide/obfuscate their software, it's quite easy to follow. The libraries that do the location tracking on the otherhand are obfuscated so now I'm at the stage of identifying where to hook before the encrypted blobs are sent to servers in China.
I've sunk about 8 hours into this so far. The message here is that to understand what some applications on your phone does you need to really invest time and effort. The developers increase the cost to the consumer to know what their application is doing by obfuscation, encryption and packing. It's asymmetric.
[1] https://mitmproxy.org/posts/wireguard-mode/
[2] https://frida.re/docs/android/
[3] https://github.com/skylot/jadx
[3] https://github.com/pxb1988/dex2jar
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Reverse Engineering Tools in 2022
I think they forgot to google translate the disadvantages of JEB Decompiler
I haven't used JEB to comment, but I've gotten a lot of mileage out of https://github.com/pxb1988/dex2jar#readme and then feed the normal Java jars it produces into https://github.com/mstrobel/procyon#readme and (of course) one shouldn't overlook picking your favorite tool for dealing with AndroidManifest.xml which often has fun things hiding in it
While digging up those links, I was reminded that some folks enjoy https://github.com/Konloch/bytecode-viewer#is-there-a-demo because it can be easier to "try out" a few of the decompilation engines, but I don't use it because it's hard to do batch things with it, versus dex2jar into procyon is automation friendly
- The Code the FBI Used to Wiretap the World
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Decompilers for android
Take a look at apktool: https://ibotpeaches.github.io/Apktool/ and dex2jar: https://github.com/pxb1988/dex2jar
vineflower
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I'm curious, what was the reason Fabric mod loader was made in the first place?
this is kind of a silly point, but the quilt community is just nicer to be around than any of the other ones in my experience, which has real effects: e.g., you attract people really really good at decompiler tech and create quiltflower which is a decompiler so good Java professionals use it. inclusivity matters! the cutting edge happens on quilt
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Question regarding a mod's safety?
The only way is to reverse-engineer it. Use something like quiltflower or javap if you want to be extra sure, and have a look through the Java code
- Quiltflower – Modern Java Decompiler
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Can AI Deobfuscate Minecraft?
Firstly, we have to decompile the JAR, turning the bytecode back into Java. This is a very difficult job: a lot of work has been put into the tools to make this happen.
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is there a extention that adds support for .class files? please let me know
Alternatively, there's this new project that I haven't tried yet: https://github.com/QuiltMC/quiltflower
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The Code the FBI Used to Wiretap the World
The decompiler they used to view that code is not very good, that output is garbled.
If you're going to take apart JVM bytecode, you're better off using Recafe or Quiltflower.
https://github.com/Col-E/Recaf
https://github.com/QuiltMC/quiltflower
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Java Decompiler Gui
They are community contributed (through using decompilers to see what the classes do) and decompiler toolchains have ways of instrumenting classes with javadoc. They are also incomplete, you really can't write a mod using only a javadocs page
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New open source Java decompiler
runs nice with jbang https://github.com/QuiltMC/quiltflower/releases/download/1.8.1/quiltflower-1.8.1.jar
What are some alternatives?
Apktool - A tool for reverse engineering Android apk files
ForgeFlower - Forge's modifications to FernFlower. Fixing various bugs/inconsistencies. Main Repo: https://github.com/MinecraftForge/FernFlower
comm - Comm is the working name of this open source messaging project.
cfr - This is the public repository for the CFR Java decompiler
ricochet - Anonymous peer-to-peer instant messaging
fernflower - Unofficial mirror of FernFlower Java decompiler (All pulls should be submitted upstream)
Recaf - The modern Java bytecode editor
MinecraftForge - Modifications to the Minecraft base files to assist in compatibility between mods. New Discord: https://discord.minecraftforge.net/
procyon - Procyon java decompiler - Procyon is a binary star system in Canis Minor
bytecode-viewer - A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
decompiler - Java Decompiler GUI