Questions tagged [ios]

The operating system by apple for mobile devices

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20 views

How to find how a hash in generated in an iOS app

I'm currently working on an iOS app to replicate a signature which looks to be generated with a MD5 hash. I'm currently using Frida, but haven't had any luck replicating it. I've used the script to ...
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17 views

How to retrieve the function that has dispatched a message to the UI

I tried to reverse an iOS app, the purpose is to retrieve the moment when the application decides whether the activation was successful or not according to an HTTP response from the server. I'm trying ...
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54 views

How can i make more space for a bigger string in Hopper disassembler?

i made an ios app which simply change the background color when i tap the button. the goal is to change the color with hopper. I successfully changed the color from blue to red but i cannot change ...
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39 views

Stripped or not ? iOS App with unnamed symbol in LLDB

I am faced with an ambiguity being a novice. I'm trying to reverse an iOS application with LLDB and all the function coming from the app (native) are labeled as unnamed_symbol in the backtrace : The ...
1
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1answer
96 views

Radare2 - “/c pointer; offset” command not giving expected response to search instances of the same pair of similar instructions

I am trying to find an offset IOSURFACEROOTUSERCLIENT_VTAB from an iOS kext(IOSurface) using radare2 and there is a need to use the command "/c pointer; offset" as per the instructions in ...
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0answers
56 views

What kind of random algorithm is used in this game?

I am playing a game for iOS that uses a deck of 48 cards and I would like to reverse engineer the kind of algorithm that is used to generate the random deck of cards such that I can predict which card ...
1
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0answers
88 views

Ghidra : iOS Application : Mach-O binary -> Symbol files of dylib or framework are not generated

I'm performing my first reverse on a Mach-O file binary through Ghidra. My problem is that Ghidra doesn't create symbol files of the dylib/frameworks that are loaded in the project. It is really ...
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0answers
16 views

Reversing an iOS app for finding the SDKs installed

I tried decrypting the iOS Target retail app from AppStore for education purposes. The libraries / SDK's used in the app are very limited which is highly unlikely compared to other competitors in the ...
4
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1answer
143 views

Reverse engineer compressed iOS app file

I want to find out the compression method used by an iOS app used for music notation to store its files. The files of its OSX counterpart are zipped files. You cannot create files in the iOS app, but ...
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0answers
24 views

Is it possible to somehow derive the decryption key for iOS app binaries?

While disassembling an IPA downloaded directly from the App Store CDN, I noticed that the binary had an unusually large entropy. Looking this occurrence up confirmed my suspicion that it was encrypted,...
0
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1answer
31 views

Dumping available XPC interface and methods

I'm reading this article, and it says: The following functions are exposed over XPC to the caller: @protocol _TtP4main21ForkLiftHelperProtcol_ - (void)changePermissions:(NSString *)arg1 permissions:(...
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0answers
219 views

Reverse engineering Unity 4 iOS game built with the legacy AOT system?

I'm trying to reverse engineer the behavior behind an old iOS app that runs on Unity 4.1.5. So far what i've done is extracted the ipa file, loaded the main binary into Ghidra, and also attempted to ...
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0answers
165 views

How are strokes stored in the Goodnotes file format?

I have been trying to reverse engineer the .goodnotes file format (a note taking app for iOS devices) and so far have discovered this: A .goodnotes file is simply a zip archive, an example file ...
2
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1answer
325 views

Attempting to reverse engineer an iOS OTA payload-like archival format

Apple's announcement of macOS Big Sur had meant the release of the developer beta. In an attempt to create the appbundle from Apple's softwarecatalog, I attempted to study the contents of ...
2
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1answer
127 views

Mysterious ARM instruction evaluating result to be 0xfe instead of 0xff

I'm facing some issues while debugging an iOS application for educational purposes. This is an iOS application found on the App Store and has some anti-debugging capabilities built in it. Pretext: ...
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0answers
32 views

finding specific string in ios dyld_shared_cache

Im trying to find the library inside a dyld cache that contains a specific string. I grepped the cache file and for the offset of the string, however when im throwing the cache file to ida non of the ...
1
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0answers
39 views

Theos Tweak compilation errors [closed]

While attempting to build a Theos tweak, even a templated one created by Theos, I will encounter the following error bash: line 1: 4665 Done swift --version 4667 Broken pipe:...
1
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1answer
86 views

IDA - ObjC - Meaning of _BYTE and dword_0?

This is my first experience disassembling/reverse engineering, and am having a bit of difficulty keeping up. For reference, I'm trying to uncover the inner workings of a pretty good library in my ...
1
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1answer
47 views

Mach-O ARM64 using literal values instead of a frame pointer (BP) register

I'm investigating an iOS app Mach-O binary in IDA and noticed it's using a fixed constant as an offset to the SP to denote the start of the stack frame instead of a register. Is this normal? ARM ...
1
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1answer
2k views

Using IDA Pro, How can I just “edit” values, Rather than patching Offsets,

Im a part of the iOSGods community, and they make lots of cheats, but they dont really do the best at teching other people how to do that. Those people never reply to my help support topics on ...
6
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1answer
387 views

How does IPA decryption works?

All IPAs being downloaded from AppStore gets encrypted on servers as part of FairPlay DRM. But decryption is accomplished on local device. As far as I know there is some hardware module which contains ...
3
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1answer
1k views

Lipo alternate for linux

Currently, I'm using lipo tool to extract the arch type from a fat iOS binary on a Mac OS. Now, I want to do the same on the linux platform for the iOS binaries, i.e. extract a given arch type from a ...
4
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1answer
5k views

OTOOL alternative for linux

I have a reverse engineering set up on a Mac machine. This set up does some reverse engineering on iOS applications(.ipa files). I'm migrating the setup from Mac to a linux machine. Currently on Mac, ...
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1answer
4k views

how should i change an instruction to NOP in IDA?

I am new with IDA assembler and i used to work with hopper app. the problem is i can't change instruction in IDA from something like CBNZ to NOP. is there any button to do this? i can't find anything ...
1
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1answer
471 views

How to identify which iOS kernelcache is installed?

I've an iPhone7 running iOS11.3 (15E216). The ipsw for this build version contains two separate kernelcache files named kernelcache.release.iphone9 and kernelcache.release.iphone10. Neither file is an ...
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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 ...
2
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0answers
208 views

(iOS lldb) Unable to debug past a splash/loading screen

I'm trying to lldb debug this certain iOS application. Its behavior is that when I click the application, the splash/loading screen comes up, then the main activity. However, whenever I try to debug ...
1
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0answers
531 views

Patching an ipa (iPhone app) using Hopper Disassembler

I have learned in the past to patch some iOS apps to bypass jailbreak detection. Today, I decided to change the UI elements in the Spotify app on iOS Platform (ios 11). I downloaded a .ipa file of ...
4
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0answers
231 views

running iOS debugserver on non-jailbroken devices

There are multiple tutorials on how to debug applications on jailbroken devices. These usually involves resigning debugserver, scp and running it from ssh with few tweaks to the entitlements and ...
0
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1answer
193 views

Newbie here: hidden values in assembly? [closed]

So i'm new to the whole reverse engineering thing with only experience in C#. So I wanted to try and change the framerate of applications (eg. this unity game) at an assembly level on iOS ( I have an ...
1
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1answer
1k views

iOS entitlements for enable calling to private API

I'd like to analyze iOS private framework that broke commonly used GitHub project called AppLister. Here's some info about the API: Framework : MobileCoreServices.framework. Class: ...
1
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1answer
613 views

Getting MobileCoreServices.framework binary in iOS11 [closed]

I'd like to try and fix some open source GitHub project that uses the allApplications from LSApplicationWorkspace call from private API which list all installed application on the device. The method ...
2
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1answer
295 views

Why function names are visible in a decompiled iOS app?

While decompiling an iOS app, all function names and object names are visible. Why ? My guess is that during the build, function names are kept by the compilator to allow the linker to do its job. ...
1
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0answers
600 views

Functions window empty for some ipa using ida pro

I suddenly noticed that my c file produced by ida pro for some of the ipa files is zero bytes. However, I'm able to decompile other ipa files, but I got some which is not being decompiled properly it ...
1
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1answer
3k views

Download and Decompile an Ios app [closed]

I want to write an automatic process that downloads an ios app and decompile it? I couldn't find any source or method to download an ios app without using any Apple Device.
0
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1answer
233 views

How relaunch iOS app once ASLR has been disabled?

On a jailbroken iOS device, I have successfully decrypted an app, and disabled ASLR, thanks to the hundredth of tutorials available. But then, none explain how relaunch the app once ASLR has been ...
0
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1answer
970 views

charles proxy only showing portion of requests?

So i wanted to see the endpoints of this android/ios app calles "Bigo Live". Like always, i've set up charles and started trackig. Funnily, it only shows part of the traffic. for example: If i use ...
0
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1answer
129 views

Accidently removed cordova platform ios folder [duplicate]

I was trying to uninstall a plugin but accidently ran the command cordova platform remove ios and it removed the app code on my macbook. I don't see anything in trash as well. Is there any way to ...
3
votes
1answer
407 views

How does the 'graphic views' on Hopper Disassembler work?

I would like to understand better what is that information on "graphic views" at the inspector of Hopper Disassembler. I've checked the tutorial but it just skips this section. Thanks.
3
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0answers
501 views

Is there an existing tool to reverse engineer Xamarin AOTDATA files?

I am currently examining a xamarin application. It has used the "ahead of time compilation" feature, which has left some of the associated .net assemblies (.dlls) as lists of function signatures ...
1
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1answer
401 views

Changing NSUserDefaults of a mac or iOS binary executable

I have an executable of a mac or ios app. This app uses a value stored for a key in NSUserDefaults to change app's flow. It looks something like below code, If( value set in user details ) ...
5
votes
1answer
3k views

getting function address by reading ADRP and ADD instruction values

Hello reverse engineers, I'm analysing a fat Macho-O binary, and it has an ADRP and an ADD instruction in it. I'm talking about these instructions: __text:00000001002E050C ADRP ...
2
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0answers
164 views

Analysis Apps for iOS10/64Bit

I need to analyze an iOS app. Since it's iOS 10 64Bit (jailbroken) this time, I'm desperately looking for good analysis tools for injecting, manipulating, anti-anti-jailbreak, tracing, and so on. I ...
1
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1answer
357 views

iOS Position-independent code and relocations

I'm reversing few iOS Mach-O application executables these days and all of them use Position-independent code (PIC; the MH_PIC flag is set). I've been expecting a large number of relocation entries (...
1
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1answer
528 views

Mach-O : Convert virtual address to file offset on disk

Hello reverse engineers, I am reverse engineering a Mach-O executable for iOS. File says: Mach-O universal binary with 2 architectures: [arm_v7: Mach-O arm_v7 executable] [64-bit architecture=12]. I ...
3
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1answer
2k views

How does Apple enforce the expiration of beta apps distributed through TestFlight

A beta app expired after a period of time. But after some investigated on the ipa file, both the certificate and the mobile provisioning profile embedded in the bundle are not expired. How can Apple ...
-3
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1answer
1k views

Dumping ipa file on iOS 10.2 [closed]

Is there a way to dump .ipa file on iOS 10.2 (jailbroken) for future reverse-engineering? Tried to use Clutch, it doesn't dump the app. Just exits with 2017-03-13 23:17:24.702 Clutch[2195:100953] ...
1
vote
1answer
108 views

Reverse engineering ARM PIC

I'm starting to learn reverse engineering so I'm trying to reverse sample app, compiled for ARM(iOS) and now I'm looking into code. This section is right before WHILE and right at the beginning of ...
2
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1answer
307 views

No LC_UNIXTHREAD segment in iOS application Mach-O

I'm analyzing load commands section of executable Mach-O file in iOS 9.3.3, Twitter app is used for ilustration. # otool -hV Twitter Twitter: Mach header magic cputype cpusubtype caps ...
12
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1answer
5k views

How are Apple App Store Apps encrypted?

I know how to decrypt an iOS app use tools. How is this encryption performed? Why can iOS apps only be decrypted on a device? Is there a device-specific key used for encryption?