Questions tagged [ios]

The operating system by apple for mobile devices

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27 views

How emails are stored in iPhone? [closed]

I just wonder how emails are stored in iPhone? In which file format are they stored? I search online but cannot find much information. One article at https://www.richinfante.com/2017/3/16/reverse-...
2
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1answer
82 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 ...
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30 views

lldb errors when attaching to iOS processes

While doing some analysis on a jailbroken iPhone (iOS 12.2), I wanted to put a breakpoint on a function inside the DVIA-v2 (Swift) application but I will see these errors b ...
2
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1answer
94 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: ...
1
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0answers
19 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 ...
0
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0answers
43 views

What type is this obfuscation ? (iOS Dylib)

Someone published a patch/crack for my iOS app. I wanted to know what does the dylib but it seems to be heavily obfuscated (all strings are obfuscated too). You can see some screenshots below. Can ...
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0answers
91 views

Learning Certificate Pinning Bypass iOS

I want to understand how to do a Cert pinning bypass. So this is what I've attempted: Attempt 1 Use frida-trace -U THEAPPNAME -i "*NSURL*" The problem with this approach is that is not matching ...
1
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0answers
32 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
43 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
40 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
661 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
244 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
631 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 ...
2
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0answers
3k 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, ...
-1
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1answer
3k 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
334 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 ...
9
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2answers
6k 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
158 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
452 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
215 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
136 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
498 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
258 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
485 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
213 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
776 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
113 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
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1answer
375 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.
2
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0answers
467 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 ...
0
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1answer
263 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
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1answer
2k 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
162 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
319 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
484 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
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1answer
106 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
256 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 ...
11
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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?
0
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2answers
1k views

Add new subroutine using IDA for ARM binary

I am trying to recreate a patch for an ARM binary. As it shows in attached picture, I have provided the before and after sections of file. In patched file, a new subroutine is added in a cave, and ...
-1
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1answer
107 views

Will jailbreaking affect file system accessibility for all apps?

I find that on a jailbroken device I can access /Applications/ in a normal app from app store, although I thought due to the sandbox I shouldn't. Maybe I should write an app to determine what ...
0
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1answer
386 views

reversing ios notes file format [closed]

I am trying to understand how to read iOS notes files as they are saved in the NoteStore.sqlite database in the iOS backup. Here are some sample files. Each file is a different note. I want to get ...
1
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0answers
56 views

Reverse Engineer an iOS MP4 Bug [duplicate]

Recently I came across and malformed mp4 that when played on the iPhone would crash the device. I am trying to figure out which bits are specifically responsible for the crash. I am wondering if ...
4
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1answer
234 views

How can a video file cause an iOS device to crash or hang?

There have been reports of a malformed h264 video file causing iOS devices to hang or crash (I've added the link in plaintext to avoid accidental clickthroughs, play at your own risk: http://www....
1
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1answer
311 views

Can a RTMPS stream be authenticated by a cookie?

After performing an mitm attack I discovered that the Nest mobile application appears to use a cookie as authentication to access data. It receives a response that gives an RTMPS address, but it seems ...
1
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1answer
4k views

Dylib can run without code sign in iOS?

I learn from somewhere dylib should be signed in iOS, otherwise dyld will refuse to execute it. But when I test the example of this post. The dylib is not signed by default in this project, but it ...
2
votes
1answer
644 views

How are the iOS kernel cache and root filesystem decrypted?

On the iPhone Wiki there are decryption keys for several, but not all, of the iPhone firmwares (root filesystems and kernelcache files). How were these keys found?
1
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1answer
490 views

%orig found outside of hook or subclass

I'm using Rpetrich's Theos repository and I'm using tweak.xmi for making tweak on multiple files for easier in management. I can build and run successfully except one thing: I cannot use hookf. ...