Ipa-Medit – Memory Search And Patch Tool For Resigned Ipa Without Jailbreak

Ipa-medit is a memory search and patch tool for resigned ipa without jailbreak. It was created for mobile game security testing.

Motivation

Memory modification is the easiest way to cheat in games, it is one of the items to be checked in the security test. There are also cheat tools that can be used casually like GameGem and iGameGuardian. However, there were no tools available for un-jailbroken device and CUI. So I made it as a security testing tool. Android version is aktsk/apk-medit.

Requirements

$ brew install --HEAD libplist
$ brew install --HEAD usbmuxd
$ brew install --HEAD libimobiledevice
$ brew install --HEAD ideviceinstaller

Installation

Binary

Download the binary from GitHub Releases and drop it in your $PATH.

Manually Build

You need Go compiler.

$ go install github.com/aktsk/[email protected]

Usage

To launch it, specify the executable file path contained in the .ipa file for -bin and the bundle id for -id.

$ unzip tap1000000.ipa
$ ipa-medit -bin="./Payload/tap1000000.app/tap1000000" -id="jp.hoge.tap1000000"

The target .ipa file must be signed with a certificate installed on your computer. If you want to modify memory on third-party applications, please use a tool such as ipautil for re-signing.

Payload # re-sign and generate .ipa file “>

$ ipautil decode tap1000000.ipa # unzip
$ ipautil build Payload # re-sign and generate .ipa file

Commands

Here are the commands available in an interactive prompt.

find

Search the specified integer on memory.

> find 999986
Success to halt process
Scanning: 0x00000001025e4000-0x00000001025e8000
Scanning: 0x00000001025f4000-0x00000001025fc000
Scanning: 0x0000000102604000-0x0000000102608000
....
Scanning: 0x000000016eb34000-0x000000016ebbc000
Scanning: 0x000000016ebc0000-0x000000016ebe8000
Scanning: 0x000000016ebec000-0x000000016ec74000
Scanning: 0x000000016ec78000-0x000000016ed00000
Found: 1!!
Address: 0x10a2feea0

By default, only integer types are searched. If you want to search for strings as well, add “all” and specify the arguments as follows:

> find all 999986

filter

Filter previous search results that match the current search results.

> filter 999842
Success to halt process
Found: 1!!
Address: 0x1087beea0

patch

Write the specified value on the address found by search.

> patch 10
Successfully patched!

ps

Get information about the target process.

> ps
SBProcess: pid = 926, state = running, threads = 37, executable = tap1000000
State: Running
thread #1: tid = 0x545ee, 0x00000001bd6552d0 libsystem_kernel.dylib`mach_msg_trap + 8, queue = 'com.apple.main-thread'
thread #3: tid = 0x54619, 0x00000001bd67a184 libsystem_kernel.dylib`__workq_kernreturn + 8
thread #4: tid = 0x5461a, 0x00000001bd67a184 libsystem_kernel.dylib`__workq_kernreturn + 8
thread #5: tid = 0x5461b, 0x00000001bd67a184 libsystem_kernel.dylib`__workq_kernreturn + 8
thread #6: tid = 0x5461c, 0x00000001bd67a184 libsystem_kernel.dylib`__workq_kernreturn + 8
thread #7: tid = 0x5461d, 0x00000001bd6552d0 libsystem_kernel.dylib`mach_msg_trap + 8, name = 'com.apple.uikit.eventfetch-thread'
thread #8: tid = 0x5461e, 0x00000001bd6791ac libsystem_kernel.dylib`__psynch_cvwait + 8, name = 'GC Finalizer'
thread #9: tid = 0x5461f, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Job.Worker 0'
th read #10: tid = 0x54620, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Job.Worker 1'
thread #11: tid = 0x54621, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Job.Worker 2'
thread #12: tid = 0x54622, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Job.Worker 3'
thread #13: tid = 0x54623, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Job.Worker 4'
thread #14: tid = 0x54624, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 0'
thread #15: tid = 0x54625, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 1'
thread #16: tid = 0x54626, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 2'
thread #17: tid = 0x54627, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 3'
thread #18: tid = 0x54628, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 4'
thread #19: tid = 0x54629, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 5'
thread #20: tid = 0x5462a, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 6'
thread #21: tid = 0x5462b, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 7'
thread #22: tid = 0x5462c, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 8'
thread #23: tid = 0x5462d, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 9'
thread #24: tid = 0x5462e, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 10'
thread #25: tid = 0x5462f, 0x00000001bd65530c libsystem_kernel.dylib`semap hore_wait_trap + 8, name = 'Background Job.Worker 11'
thread #26: tid = 0x54630, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 12'
thread #27: tid = 0x54631, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 13'
thread #28: tid = 0x54632, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 14'
thread #29: tid = 0x54633, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Background Job.Worker 15'
thread #30: tid = 0x54634, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'BatchDeleteObjects'
thread #31: tid = 0x54635, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Loading.AsyncRead'
thread #32: tid = 0x5463f, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'UnityGfxDeviceWorker'
thread #33: tid = 0x54641, 0x000 00001bd6552d0 libsystem_kernel.dylib`mach_msg_trap + 8, name = 'AVAudioSession Notify Thread'
thread #34: tid = 0x54658, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8
thread #35: tid = 0x54659, 0x00000001bd6552d0 libsystem_kernel.dylib`mach_msg_trap + 8, name = 'AURemoteIO::IOThread'
thread #36: tid = 0x54662, 0x00000001bd679814 libsystem_kernel.dylib`__semwait_signal + 8
thread #37: tid = 0x54663, 0x00000001bd6552d0 libsystem_kernel.dylib`mach_msg_trap + 8, name = 'com.apple.CoreMotion.MotionThread'
thread #38: tid = 0x54664, 0x00000001bd65530c libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'Loading.PreloadManager'

attach

Attach to the target process.

> attach
Success to halt process

detach

Detach from the attached process.

> detach
Success to continue process

exit

To exit medit, use the exit command or Ctrl-D.

> exit
Bye!

Trouble shooting

Failed to get reply to handshake packet

If you get the error /private/var/containers/Bundle/Application/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/hoge.app: error: failed to get reply to handshake packet and can’t communicate properly with iOS device and lldb, launch Xcode and build some app, and it will work.

Could not connect to lockdownd

If you get the error Could not connect to lockdownd. and can’t communicate properly with iOS device and ideviceinstaller, launch Xcode and build some app, and it will work. If this does not solve the problem, please update ideviceinstaller and libimobiledevice to the latest versions using the example of commands in the Requirements section.

Could not start com.apple.debugserver

This can be fixed by installing the latest unversioned code of libimobiledevice and ideviceinstaller by adding the --HEAD option when doing brew install.

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