Questions tagged [ios]

The operating system by apple for mobile devices

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1answer
22 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 ...
0
votes
0answers
8 views

App Store IPA - why it would suddenly need a “provisoningProfiles” entry in Info.plist? [on hold]

An IPA I have acquired from Apple's App Store has a "provisioningProfiles" in its Info.plist. The "provisioningProfiles" entry was not in previous versions of the IPA file. Looking at another few ...
3
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1answer
119 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 ...
1
vote
1answer
69 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 ...
2
votes
0answers
408 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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0answers
18 views

LLDB Cannot calculate virtual address from ASLR slide

I am trying to set a breakpoint at an Objective-C method in an iOS app (armv7). I create a toy app, dumped the sections to find the loaded address of the __text section, and calculated the mapped ...
1
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1answer
164 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 ...
4
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2answers
3k views

Can not continue debugging after SIGTRAP

I am trying to debug an iOS app with gdb and when I hit a breakpoint I get this error, and can not continue. Program received signal SIGTRAP, Trace/breakpoint trap. [Switching to process 190 thread ...
0
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0answers
44 views

Unity3D Application.genuine implementation

How is Unity3D Application.genuine actually implemented on Android and iOS? Are there any publicly available analyses? Did anyone try to reverse it? I know it is trivial to modify the property and ...
2
votes
1answer
247 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 ...
1
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0answers
1k 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
votes
1answer
1k 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 ...
9
votes
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 ...
3
votes
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 ...
41
votes
1answer
79k views

Decompiling iPhone App

I've been searching this site and more, but I haven't had much luck. I want to decompile an app to see how part of it works, and I've tried multiple programs. I've tried Hopper, IDA, and some other ...
0
votes
1answer
97 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 ...
0
votes
1answer
112 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 ...
2
votes
0answers
90 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
370 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 ...
58
votes
7answers
104k views

Possibilities for reverse engineering an ipa file to its source

I browsed a lot, but can't find any resources for reverse engineering an ipa file (iPhone application). Is there any method to reverse engineer an ipa file to its source? I've tried to rename it to ...
11
votes
2answers
3k views

Generating Snapchat Snaptags (“QR” Codes)

For those that haven't seen, Snapchat now has a special type of image based code that allows you to quickly add friends by pointing the camera at the screen, similar to a QR code, called "Snaptags". ...
4
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0answers
194 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 ...
1
vote
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: ...
0
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1answer
522 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
votes
1answer
398 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
votes
1answer
237 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
375 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 ...
0
votes
1answer
2k 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
168 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 ...
3
votes
1answer
324 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.
0
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1answer
125 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
1k 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
votes
0answers
157 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
vote
1answer
258 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 (...
0
votes
2answers
834 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
vote
1answer
414 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
votes
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] ...
9
votes
1answer
4k 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?
1
vote
1answer
95 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
votes
1answer
193 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 ...
1
vote
1answer
279 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 ...
2
votes
1answer
590 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
votes
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
votes
1answer
328 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 ...
4
votes
1answer
216 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
vote
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 ...
1
vote
1answer
3k 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
3answers
2k views

Any Disassembler for iOS?

Is there any iOS app for arm Disassembling? I mean one that can run on iPhone. Nor IDA or Hopper have any iOS version
3
votes
1answer
299 views

iOS Obfuscated Import Table

I'm looking at an Apple iOS binary file which is heavily protected and I trying to figure out if there's a way to get some of the information back. When I open the binary in IDA I see this in the ...
1
vote
1answer
576 views

Find cryptography used by iOS applications by analyzing ARM assembly in IDA?

I am looking at the disassembly for iOS applications and need to figure out a way to analyze the cryptography used. I have tried using different plugins for IDA such as FindCrypt, IDAsignsrch, and ...