Questions tagged [patching]

Patching is the process of adding or deleting code from an executable file in order to modify its functioning.

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Statically injecting translated NASM assembly into existing ELF binary

I'm trying to statically patching ELF binaries in order to incorporate code that can help provide run-time protection. In an effort to save time writing and debugging assembly, I took the following no-...
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30 views

Relative/absolute addressing; RVA, ASLR, the relocation table and patching instructions

I've been trying to learn reverse-engineering for fun, cracking my own dummy games and whatnot and I just learned ASLR is a thing. I'm now trying to re-conceptualize everything I've read so far ...
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36 views

ARM7 32-bit Branch Offset Calculator

I need to patch an arm7 program by replacing this fopen function by another function. .text:00018D68 52 D7 FF EB BL fopen ... .plt:0000EAB8 ; FILE *fopen(const ...
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78 views

How to see what has changed in a patched binary?

I am exploring MacOS Deckset app. It has a trial version available on the official website. But there's a cracked version available on torrent trackers. I want to know what was changed by the people ...
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1answer
106 views

Construct a number from 0-999.9 using 5 data bytes of a MIDI SysEx message

I'm sending MIDI messages to a proprietary turntable that has an LCD screen on it. The normal software sends out updates via MIDI SysEx to display the current tempo on the LCD. The MIDI is being ...
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1answer
61 views

OllyDBG saved executable crashes

I'm kind of new to this sort of thing so I hope someone can help me. I'm currently trying to understand how most malwares infect other files/modify an exe. Using Visual Studio 2017 I made an exe (with ...
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1answer
52 views

How can I mod the built-in software of my digital piano?

I'm curious if anyone has any insight on how I can manipulate or mod the code for the built-in software of a digital piano (specifically the Kawai ES8 - or really any digital piano with a display ...
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101 views

Android app crashes even while not edited, how can I solve it?

Installed an application from google playstore and then transferred to it my computer to apparently edit it and without any changes I made to it then I tried to install it through ADB, well the ...
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1answer
99 views

Hiding a file in a Windows operating system

I am trying to understand how to hide a file in windows as a way to learn about win api and malware analysis. What I am trying to do is to make a file "disappear" via some kind of manipulation. But I ...
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2answers
74 views

Patched Application causes Acces Violation c0000005

I've been working with this application to remove it's trial limitations. But every byte I change, it throws an acces violation. Piece of the code: Original: 003354C6 - 0F85 D3000000 - jne ...
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1answer
61 views

Executable code in the same location differs in memory and on disk

I'm trying to inject code to change the byte value of a CMP in an executable from 0 to 2 at runtime, in order to effectively no-op a boolean comparison as part of an effort to insert my own behavior. ...
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81 views

tutorial of run-time hacking with Dnspy

Is anybody have good resource or tutorial of run-time hacking or memory hacking with .NET Applications with dnspy.
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91 views

Patch Arm binary with Ida

In Ida I can patch binary that run on x86 , but not binary that run on Arm. How can I simply patch binary , change assembly(not only hex) and save to new binary file
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1answer
55 views

How to Insert Call to Already Imported Function in amd64 Windows DLL using IDA Pro?

I am trying to patch a function in 64-bit Windows DLL to load data I have inserted into the resource table of the DLL. I want to insert code something like this: mov r8d, 0Ah ; lpType mov ...
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82 views

How to hook eval function in node.js

As the eval() function of JavaScript is an evil, I want to hook or monkey-patch eval() function of JavaScript in node.js. I want to intercept all arguments passed in eval() function. Please guide me ...
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118 views

How to Modify CBZ Branch in ARM64?

If I want after running the CBZ W0, loc_C5C8 command Run to the ADRP X8,#selRef_curent_version@PAGE command regardless of the condition (in picture), what should I do?
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68 views

How to save a binary after patching it in cheat engine?

The title asks it all tho But cheat engine will not allow you to save the patch binary so what methods can I try to save it after I patch it in cheat engine?
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50 views

How to use arm-none-eabi-objcopy to extract texts, translate, and rebuild ELF file

I have this arm elf file: https://www20.zippyshare.com/v/2yLS1H8D/file.html I want to extract the user-interface texts to translate them to my local language. I found the section containing the texts ...
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33 views

Alternative APIs to hook instead of messagebox for message pop ups?

So i am reversing an app that pops up a message at some point, but its not doing this using messagebox i also tried to pause and then run to user code but didn't work, so what are some of the other ...
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1answer
295 views

How to change the title of a windows GUI app when patching? (the title that usually writes the application name)

So I'm trying to patch a binary (its a GUI app), and i want to patch the title of it as well when I'm patching it, and by title i mean the text that appears on top of the app that usually is the ...
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2answers
83 views

How to add a message box to a PE [closed]

So, I have a "simple" question. I have this PE that I want to show a message box when the file is launched. How can I patch the file and make the window? Thanks!
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2answers
139 views

Find a instruction in a binary file (PE) based on a virtual address of a string reference

English is not my first language, so I'm sorry if my text isn't so clear. I'm trying to program an automatic patcher for a PE binary that should work for multiple versions of this executable. For ...
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3answers
170 views

Injecting C++ code, while also maximizing compatibility with other injections

Using the New Vegas Script Extender C++ API for Fallout New Vegas, I am able to write to the process' memory directly at runtime through a .dll plugin that's loaded by the NVSE injector. But it is not ...
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210 views

Does the loader fill the IAT table of an .exe in load time by checking the corresponding export tables or during run time?

I came upon this question : Can we hook the Nt or Zw functions using IAT hooking, or just inline hooking? and it got me wondering, lets say for some reason some function was not in the IAT of our ...
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44 views

Add MessageBox statically modify

So i'm doing this challenge which i have an exe file and a dll all i have to do is modify it statically to pop a MessageBox. The exe file is loading the dll which load the MessageBox, with ollydbg ...
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80 views

Frida: Make executable immune to updates

I have few questions which are related to each other so I'm going to ask all of them here. I have a dll which has no debug symbols(ASLR and relocation is disabled). The functions have names like ...
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272 views

In reverse engineering, what does it mean to “patch a file”?

I've been solving some crackmes, and every file that I download, in the "instructions" says: "Patching is obviously not allowed". What does that mean? And how does one patch a file?
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65 views

Hex editing a program to change variable types

For starters guys please don't get mad at me because I really googled this question for a while and couldn't find a satisfying answer. Also if I'm asking an idiotic question, I apologize beforehand. ...
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384 views

How to export to *.so file after patching in ghidra

I'm using ghidra to patch an *.so file in the Android APK. While exporting the patched file from ghidra, using the "Export program" option from the "File" menu, it don't have *.so in the supported "...
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60 views

Output address path during .exe execution

I have an obfuscated software. I'm a beginner in this area, so I don't find where a patch would be useful for what I want to do. It turns out that I have an idea of how I could find out in which ...
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1answer
73 views

How to write sequence of machine code in radare2?

I know how to write an opcode and how to increment and decrement machine code using plus and minus keys. However, how do I write a sequence of machine code at an offset? E.g. if I want to write five ...
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148 views

Defence against cracking [closed]

Say I wrote an application and published demo version of it with a possibility to buy a full version. I was wondering if it is possible to stop people from cracking it, so that the only ones who use ...
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59 views

Any way to edit an ELF binary without hex? [duplicate]

So, this is a noob question, I am a complete beginner in this field, so sorry if I'm wasting your time in any way. I wanted to know, if there is a way to edit an ELF binary without using a hex editor....
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65 views

Is it possible to change a signed byte to an int in compiled assembly code?

I'm trying to mess around with an old game and I want to reposition a UI element. I found the address of where the x and y position get set (It's set to an X position of 90 and a Y position of 358) ...
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140 views

Is it possible to add a label to an ELF executable and then call that label? If so, how?

Let's say we have this simple "hello world" nasm code that will be compiled to an ELF executable: global main section .data message db "Hello World!", 0x00 section .text main: call ...
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79 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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87 views

Patching an app that updates frequently

Hello i am working with an app coded in c# which updates very often usually within 2-3 days or sometimes every 12 hours The updates are really needed for the app to work So i was wondering what can i ...
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668 views

Assemble function of IDA Pro not working properly

I am using the Patch Program option of IDA Pro to edit the assembly of a binary at runtime. When I enter the following instruction: mov rax, [rsp + 0x48] I get an "Invalid operand" error from IDA ...
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53 views

getting %localappdata% in asm

I have an old windows x86 application that no longer works properly since windows 8. This app creates files within its own folders for things like app settings. Unfortunately, Microsoft no longer ...
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86 views

immediate value change when start debugging

I patch the code for my work. I have a problem with code patching. I use IDA pro 6.8. I added code like this. (Assembly) (Hex dump) mov eax, 638BACh --> B8 AC 8B 63 00 Not problem ...
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1answer
267 views

Does V-Table patching (via DLL injection) only work for COM objects/classes?

Okay so not too long ago i was introduced to the concept of hooking/detouring, it took me some time to get my head around, but despite the lack of information available, eventually i was able to hook ...
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1answer
385 views

IDAPython Code <-> Data

I'm looking for a way, to make programmatically change of data type. This is the same as you press 'C' or 'D'. For example convert this: .text:00401008 unk_401008 db 55h ; U ; ...
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1answer
902 views

Outputting a patched DLL from x64dbg

I've been working on reversing an extremely outdated piece of software that I happen to need in order to get at the information stored in some equally outdated "database" files. Using x64dbg, I've ...
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2answers
1k views

Trying to change JE to JNE in x32dbg for instructions that change

I have found two if statements in an application that I want to alter. I've made the two changes and saved the patch file using x32dgb and the application boots up successfully, however; the change ...
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0answers
379 views

How to solve anti-patch protection involving NtContinue? [duplicate]

I'm having an issue when trying to patch an application. If I open the .exe application with x64dbg, it first goes through ntdll.dll and then runs the application module. It works fine as long as I ...
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1answer
247 views

ELF binary corrupted after adding instruction in non-executable section

I've been messing around a little with Radare2 trying to master binary exploitation and patching. I added a couple of assembly instructions to an x86 elf binary in a non-executable section of the file,...
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1answer
1k views

Radare2 - Insert asm instructions without overwriting

In order to patch a x86 elf file on Linux, I'm struggling to insert a specific assembler instruction into the binary file without overwriting any of the preexisting instructions. I've been reading ...
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2answers
2k views

Patching a class file inside Jar using bytecode

I was trying to patch an application, but the application is required to exact same class size as the original one but editing class file with JByteMod, Recaf or whatsoever always changes the class ...
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1answer
513 views

How do TDBCtrlGrid or TDBCtrlPanel Borland Delphi controls add new text rows?

I am trying to reverse engineer an old native application written in Borland Delphi in order to modify it for my needs: The application interfaces with the special hardware and displays events that ...
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1answer
60 views

OSX User level application Preferences (plist) are not loaded after binary modification

I am working on a project that requires to modify an existing OSX application's dylib binary (few bytes to correct an obsolete URL). I do not have access to the application source code nor the code ...