Questions tagged [patching]
Patching is the process of adding or deleting code from an executable file in order to modify its functioning.
137
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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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3
votes
2
answers
403
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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2
votes
2
answers
895
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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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3
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2
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936
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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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1
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1
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277
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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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2
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0
answers
848
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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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0
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0
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62
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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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2
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1
answer
146
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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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-3
votes
1
answer
166
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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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3
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0
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92
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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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1
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74
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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) ...
0
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1
answer
237
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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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1
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0
answers
153
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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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0
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276
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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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0
answers
2k
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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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1
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0
answers
70
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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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1
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214
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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 ...
- 3
1
vote
1
answer
573
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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2
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2
answers
1k
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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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1
vote
1
answer
2k
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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 ...
0
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2
answers
6k
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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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2
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0
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607
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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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1
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1
answer
332
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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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1
vote
1
answer
2k
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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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2
votes
2
answers
4k
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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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1
vote
1
answer
926
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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1
answer
108
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 ...
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2
votes
2
answers
2k
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translate arm instructions to hex
I looking for simple tool(not site) to translate arm instruction to hex like http://armconverter.com/.
Without linker , I want put 1 instruction , and want get the hex .
Do you know one please?
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3
answers
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Remove a mutex on windows (with debugger/disassembler)
I'd like to patch an app to avoid it to use/create a specific mutex, because this one prevents the app from running in multiple instances. I'm already able to close the mutex's handle with a program ...
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1
vote
2
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159
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Edit arm thumb2 intelhex file
I have intelhex file to arm 32 bits thumb 2.
I want edit this file add/ change instructions.
Looking for easy and free tool (prefer gui windows tool ) to do it please.
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0
votes
1
answer
4k
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How to patch a binary file and save it? [closed]
I have an ARM executable binary file and I want to patch it at precise virtual addresses. Is there any safe (and automated) way to perform this task ?
Any scripts or tools are welcome!
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1
vote
2
answers
8k
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How to add code to compiled java class
I have java code that is compiled to a .class file.
There is a function that gets few parameters and do some action (e.g. get int x and int y and do x+y)
I want to add to this .class file code that ...
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1
vote
1
answer
8k
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Inject code into exe
I don't know whether this is the right place to ask this question. I want some guide lines on this subject because I don't know how to search my problem in the internet.
I want to create an ...
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5
votes
1
answer
427
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School project - Cracking a school emulator
John here. I'm in the last half of our IT school, and we got a side project from one of our teachers. He wrote a emulator back in 2009 in delphi, which is in use till that time. Nothing special, just ...
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2
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10k
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How to edit and modify a class with ILSpy + Reflexil
In the Maxsea.SmartDesktop.dll, I want to edit and modify class b1g.
There is this in :
if (isCrackedResult != null && isCrackedResult.IsCracked)
and I want to modify for this :
if (...
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2
answers
234
views
What's the best way of improving already compiled binary?
Like if I want to patch a function in a PE.
Now my way of doing this would be inserting a new section using lets say LordPE and then compiling anything I want to add up here and patching the original ...
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1
answer
194
views
Is it possible to make a string bigger on an executable without breaking it?
I am a new reverse enigneerer. I know I can patch strings using a hex editor, but I obviously can't add or remove a single byte. Is there any workaround that will let me make a... let's say, 10 byte ...
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2
votes
1
answer
2k
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Get list of functions (including non-exported functions!) in running executable
I'm working on a native binary patching library. It currently works on Linux and I'm trying to add Windows support.
For that, I need to implement a way to enumerate all functions in a PE binary (EXE) ...
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votes
2
answers
6k
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Make this function return true
Sorry, I'm quite new to assembly, and I'm trying to make the code bellow return true:
.text:1000E3E0 ; =============== S U B R O U T I N E =======================================
.text:1000E3E0
.text:...
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0
votes
1
answer
660
views
How to patch file by adding a branch instruction to another address in arm
I have disassembled two armv7 files in IDA. I am trying to figure out how I can create a patch to change one to another.
The original file has:
__text:00017B60 loc_17B60 ; ...
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1
vote
1
answer
2k
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How to bind two EXE files?
I'm working on a project that needs to be a stand-alone executable but run another executable whenever it is started.
Unfortunately I don't have access to the source code of the second program to ...
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3
votes
1
answer
790
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How can I create an appropriate Japanese .tbl file for Hex Editing?
I'm trying to edit a Japanese Configuration executable using Resource Hacker and I just want to translate the UI stuff to English. There are also a few English text that I was able to find and ...
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2
votes
0
answers
335
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IDA does not follow relative jump, executable patching
I created small C program (x86) with this asm code inside main:
__asm
{
jmp label // EB 02
nop // 90
nop // 90
}
label:
Loaded it in IDA (in static mode, so ...
- 21
2
votes
2
answers
10k
views
edit instructions directly in visual mode
I know we can edit opcodes in radare2's visual mode using i.
But is there any way to edit instructions directly in visual mode?
In my case, the instruction is:
jae 0x8048450
And I want change it to:
...
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1
vote
2
answers
5k
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Binary patching using radare2 in debug mode
Im a newbe in radare and while I tried to patch a crackme binary, I opened it the first time in debug mode (-d), while debugging I used oo+ to reopen it with write mode, when I modify an instruction ...
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vote
1
answer
1k
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patch function in ARM binary to always return 0
I have an ARM binary in which I want to patch a function to always return 0.
My understanding is this means I need to set r0 register to 0.
The disassembly looks like this
STMFD SP!, {R4-...
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1
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2k
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Patch packed DLL by themida [closed]
How to patch dll file packed by themida? I've dumped the unpacked file and patched it. But the program didn't recognize the unpacked dll. The original file and dumped file have ~8mb different size.
I ...
- 3
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vote
1
answer
1k
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IDA & patching question
I have an app in which I have to manually alter several flags in order to get to the part of the code Im interested in (imagine altering ZF to pass JNZ instruction). I have to do this every time I run ...
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4
votes
1
answer
841
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Are PATCH shims (.sdb's) no longer functional in Windows 10?
No matter what I do, I can't seem to be able to get my Windows 10 (64-bit, build 1607) to apply any patches in custom SDB's (as described in the article of Jon Erickson from 2014).
I'm using Jon's ...
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13
votes
3
answers
21k
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Remove code signature from a Mac binary
How can I remove the code signature from a binary so that I can patch it without the binary refusing to run afterwards?
Needless to say, I'm not the original creator of the binary, nor I have the ...
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