Questions tagged [android]

Android is Google's Linux-based operating system for mobile devices. Initially developed by Android, Inc., Android is the world's most widely used smartphone platform.

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1answer
608 views

Radare2 - How to debug Android native code (dynamic analysis)?

I'm using Termux(root) on LineageOS 16 (Android 9) with radare2 (v3.6.0 linux-arm32). When i attach to a process with 'r2 -d pid' the app freezes properly but doesn't continue with 'dc'. I'm not sure ...
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0answers
100 views

How to find implementation of native method in the library .so (Android)

I need to make reverse engineering of one android app. In this app I found class with name Im2MessageNative, this class contains a lot of native methods. For example: static native long ...
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4answers
180 views

What information may supply the uninitialized data to security team?

When I was reversing some well known Android chat applications (I can not disclose which specific ones, but all of them where owned by companies with 1 billion+ capital and have hundreds of millions ...
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1answer
933 views

Where is Android binary XML format documented?

This format is always trouble for reverse engeneering. When there are question about binary XML, the usual answer is "use apktool" (or something similar). However, no tool is perfect; actually all ...
3
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1answer
96 views

DEX file referenced type is not defined in file

I am analyzing a dex file and to ease with reverse engineering, I converted it a jar so it could be decompiled. In the file android/support/v17/leanback/media/MediaControllerGlue.class, the following ...
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1answer
14k views

Decrypting Lua Files

I am trying to decrypt a lua file which has been encrypting using a key. Some background to the LUA file. Its from an android Game i decompiled the APK and found that all the lua files are encrypted. ...
3
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2answers
223 views

Firestick get application binary

I would like to reverse engineer and ultimately patch an application on my Amazon Firestick. To doo this, I want to analyze the app executable. I believe third-party apk's are stored in the /data ...
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0answers
2k views

Obfuscated Config Files: EHI Files for HTTP Injector

So I have an ehi file, which is a configuration file for an Android App called HTTP Injector. Of course when I try to see it as a simple text, I just get random characters. What tool could I use to ...
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1answer
762 views

IDA taking forever to run autoanalysis on remote Android app?

I've disassembled and run auto-analysis on a .so file from an Android apk, and then hooked up the remote ARM debugger to an emulator. IDA then asked me if /data/app/com.package.name/lib/arm/libil2cpp....
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0answers
101 views

Downgrade HTTPS (strip SSL ) to HTTP on Windows (if possible) [closed]

Long Question: I have an Android app: https://transfer.sh/mY240/com.phonegap.voyo.apk which connects to an API: http://www.24ur.com/lbin/WebApp/Popplus/Android.php the problem is the api authors are ...
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0answers
635 views

Android APK debugging: modify value of smali register

I am debugging an apk app that I do not have the sources for. I want to debug it on a smali level, not decompiled. I used to do this with apktool, but looking at their website, smali-debugging is ...
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0answers
159 views

Reverse Engineering Android ROMS to detect malicious code

I'm working on reverse Engineering Android ROMS (Firmware you can flash onto your phone) so that I can scan them for malicious behavior. I've been looking all over the internet but unfortunately I'm ...
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0answers
603 views

Unable to attach java sources to APK being debugged in Android Studio -- Option not displayed

This article (https://developer.android.com/studio/debug/apk-debugger) explains how to debug third-party APKs and set breakpoints by attaching the java source (you can use decompiled code to get it ...
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0answers
133 views

IDA Pro how debug constant function returning different results?

The code below is executed with the parameters (0, 4, 0) , the first 0 being an int pointer casted to an int, and these are the same every time. After execution, a 3 digit number string is returned/...
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1answer
2k views

How to deobfuscate native Android library obfuscated with OLLVM?

When I load the binay in IDA, all I can see are loads of .datadiv_decodeXXX... functions and this is because of OLLVM. I know it is possible as a Chinese article I found said they were able to ...
5
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1answer
487 views

Reverse engineering android native packer

im trying to Reverse engineering an android app and the app have 4 folders in the /data/data/{package} folder ├───app_dexprotector │ 823517D25836B88F1C499C02370A047E.dat │ ...
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1answer
81 views

Is there a way to perform dex/smali/android class verification on linux or mac?

Is there a way to perform class verification on dex or smali files before the apk is pushed to the android device?
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0answers
98 views

What changed after Android 8.0?

I compile code below use library Cydia Substrate, and run on a test application, and it works Android 4.4, 5.1, 6.0, 7.0, 7.1. But on Android 8.0+ application does not work with this code, why is that?...
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1answer
609 views

Android how can i hook native exported functions from a shared library *.so?

It needs to work even on older versions of android (3.x and above) specifically the old Sony "PS Certified" devices, the device im working with (Sony Tablet S) i have seen reports online that ...
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0answers
888 views

decompiled android application with only one class [DexProtector]

I'm trying to reverse engineering an android app and it's mostly for an experiment but I have a problem that I can't find a solution or even what is the problem. I decompiled an app with JADX-gui and ...
2
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1answer
3k views

Android application fuzzing

How to do fuzzing in Android applications? Do we have any fuzzer specific to the android? Actually, I am looking for an easy way to do fuzzing while performing penetration testing of android ...
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1answer
109 views

decomplied apk with bad parameters

I'm trying to reverse engineering an android app API so this is what I tried: First the app was using Okhttp certificate pinning and I couldn't track the URLs with Charles then I tried this method ...
3
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1answer
2k views

Extract a secret from an Android apk or .so file

Context As an exercise I am researching all methods of hiding a secret in an android mobile app binary... Yes I know that with more or less effort they can always be extracted with static analyses, ...
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1answer
342 views

Android application can't open pasted SQLite database

So I have an installed application on my Android phone and it stores some data in an password protected SQLite database in the /data/data//databases/ folder. I used adb shell to move the database to ...
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1answer
271 views

WebSocket debugging in Javascript app gives "401 Unauthorized" [closed]

I'm attempting to reverse engineer a private API used by an Android app that makes use of WebSockets. These requests are made from JavaScript inside a WebView. I use Charles to intercept both HTTP ...
3
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1answer
1k views

Sniffing serial Bluetooth traffic on Android

Related to UE Megaboom serial protocol: I am trying to get some insights on the serial protocol spoken by the UE Megaboom, which I suspect is how the app controls the advanced features of the speaker. ...
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0answers
182 views

Detect compression algorithm in .NPK archive

I'am trying to unpack Android game archive file (.NPK). The game is "Nvidia Glowball demo" (it has been pre-installed on my android tablet) Archive structure seems to be simple, but I can't ...
2
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0answers
296 views

Android APK is somehow verifying package signatures without calling PackageManager.signatures

I'm reverse engineering a very popular Android app. They perform some type of signature verification on the APK, however they do it without: Calling PackageManager.signatures Calling PackageInfo....
5
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1answer
2k views

Find function in a stripped dynamic ELF library

Im currently reverse engineering an android app and this app calls a function named "getUserInfo" in an ARM 32bit ELF library called "libcms.so" (from TikTok) via the Java Native Interface. My ...
3
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1answer
144 views

Enumerating (name, addresses) in PLT of an ELF file without elf.h

I want to show users imported symbols of a given ELF file like this(#1) in a disassembler project.(Android app) 1d21a: f7fa e8e8 blx 173ec ; __android_log_print@plt ... Currently, I can only show ...
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0answers
91 views

How to patch JNI library to call functions on Linux

According to this post it is possible to run functions inside a shared library so long as they do not have a dependency on the JVM It works by patching the .dynamic ELF section to remove ...
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1answer
955 views

How does API call work on Android (NDK)?

In windows platform, an application usually references its IAT(Import Access Table) to get the address of the APIs it wants, then call it. Then some mechanisms are done as demonstrated here nicely. ...
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0answers
177 views

Common practices for 'hiding' a class within an Android application?

I've recently gotten into Android reverse engineering, and I've been messing around with some apps lately for education/research purposes to see how some things are done with private (mobile) APIs. ...
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0answers
95 views

Reversing Android BLE Application not showing in logcat

I'm new to reversing and I would like to reverse a BLE Android Application. (jbsmartbulb) I have seen in the package com.actions.ibluz.b this call : public void onCharacteristicWrite(final ...
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1answer
331 views

Gdbserver and idapro

I would like to reverse a file so of an apk using idapro (on windows) and gdbserver(on remote target device) . I arrived until the attach of the running process. But after? Is there a tutorial ...
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2answers
7k views

How difficult is to decompile C++ file?

I am writing an Android app with AES encryption and I am going to save AES key as a string to a C++ file with extension .cpp. I am also going to create an iOS app which will use the same AES key. Is ...
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1answer
6k views

How to use IDA Pro debug Android Application? [closed]

Any person can give some examples or resources about how to use IDA Pro debug Android Application?
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0answers
144 views

Joysmade USB/WiFi microscope

Short intro: I am building an electronics workbench, and I needed a microscope. This Joysmade USB/WiFi microscope was $45, and it would work with exception to the below issues. My "dumb" TV was set ...
3
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2answers
2k views

Android APK reversing - Can't find the Main Class

I am reverse engineering an APK file. From the AndroidManifest.xml file, I found the class name (com.dfmlhsd.xecpwdugfsln.hnzpsm.KeQXGRNGu) corresponding to Main Action as shown below: <...
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2answers
296 views

Disassemble ELF - PC is set to 0?

I tried to disassemble a ELF file which is a shared object file executed on armv7a (Android). I saw a strange block. It seems that the PC, program counter register, is set to 0. Did I miss something ...
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3answers
970 views

Proxy debugging tool doesn't capture traffic from some online games

I'm analyzing Android games with Fiddler 2 to see how the game collects data. There is a problem, both Fiddler 2 and Charles Proxy doesn't capture any traffic from some online games. All i got are ads ...
3
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1answer
109 views

Is it possible to check what engine was used to produce an Android game?

I want to know what engine was used (if any) to produce an Android game, is it possible? What to look for in decompiled apk? Or maybe I have to check with a proxy for some certain http requests? Or ...
0
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1answer
414 views

What does "Process exited cleanly (number)" mean?

I'm trying to bypass the security that checks if a file is modified on an android app and will crash without error if modified. It have around 10 fake crashes. I have bypassed some of them in smali ...
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0answers
74 views

Missing Map from Java Native Method to C Code

When writing a C implementation for a native Java method in Android, the rule is to name the C function according to the convention "Java_com_...". But I encountered an APK in which there are no such ...
2
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1answer
476 views

Reversing video protocol for chinese drone so i can view the stream outside of the app

I am trying to view the video stream of the vento protocol air drone on my computer. The final goal is to get the video stream into python or c++ for opencv; however, if i can just view it in a ...
2
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1answer
326 views

Android 7.0+ Monitoring application HTTPS requests

I am trying to capture https requests an application performs during runtime without any success yet. Different failing approaches, using mitmproxy / charles proxy and user ca certificates, obtaining ...
3
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2answers
4k views

android unity intercept w/ Frida

I'm trying to extract symbols from an Android Unity game to detect something related to the game which I can intercept and replace variables. The following code will enumerate symbols from libmain.so,...
3
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1answer
401 views

does android apk contain game mechanics?

Let's say I have an apk of an android fighting game. The mechanics of the game includes how characters use their skills, how the damages are calculated, etc. Are such mechanics stored within the apk? ...
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0answers
96 views

Is there any way to get value from bytecode under JDWP without access to source?

When I debug android app through jdwp using jdb, it seems I can't get anything from the bytecode level. I know normally it's fine as long as we have the source line info and use a decompiler, but the ...
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1answer
631 views

How to find the executable code of the native method in the library * .so? (Android)

I'm doing reverse engineering of a mobile application for android and I had a question how to find the executable code of the native method in the library * .so. From the code of the code, the native ...

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