Questions tagged [windows]
Windows refers to the Microsoft Windows series of operating systems.
817
questions
1
vote
1
answer
87
views
Unix system with windows-style registry
When trying to determine the filesystem of a firmware image using binwalk, I encountered a strange combination.
The binwalk is returning a lot of Unix paths, but some of them contain a typical windows-...
0
votes
0
answers
39
views
Windows boot sequence operation
I am targeting at creating software for the Windows pre-boot environment but I have hard time finding conclusive information about how it operates. For background: this software will communicate with ...
- 1
0
votes
0
answers
32
views
Audio problem rushing?
After using a new Pc for some time, suddendly a problem with the Audio occured.
While listening music with Headphones, some rushing noise appeared.
I tried to narrow down the problem :
Checking the ...
- 1
0
votes
1
answer
68
views
How to convert variable to struct member in IDA?
I'm working on a windows program which is walking PEB Ldr list. the related types are as follows:
struct LDR_DATA_TABLE_ENTRY {
LIST_ENTRY InLoadOrderLinks; // offset = 0, size = 0x10
...
- 3
0
votes
0
answers
34
views
Exe self-modifies strings searched in debugger
I'm studying a Windows binary file and while searching for some string I noticed the EXE modifies the searched string, e.g., if I search "This is a string", it's modified to "his is a ...
- 1
0
votes
1
answer
90
views
Need help understanding why Netflix prevents me from downloading with VPN
When using Netflix via the Windows desktop app with a VPN, streaming movies works fine but downloading does not. The download gets automatically paused, and after a minute it shows error code DL1-...
- 101
0
votes
0
answers
86
views
from executable to assembly source code?
let's say i have an ".exe program" and i want to disassemble it and get "disassembled code" .
my question is => can i maintain and organize that "disassembled code" ...
- 23
0
votes
3
answers
107
views
how to stop windbg when register value changes
I'm using windbg to find the memory of a specific structure in windows. The way is to look at certain values stored in stack and registers in entry function. I notice that register ax holds that value ...
- 313
0
votes
1
answer
56
views
unable to figure out how a windbg extension work
I'm trying to figure out how the below windbg extension works
!ndiskd.nbl addr -hexcap(or -data)
kd> !ndiskd.nbl ffffce8c96bde070 -hexcap
# NET_BUFFER_LIST ffffce8c96bde070
# NET_BUFFER ...
- 313
1
vote
0
answers
51
views
Process stuck on the entry point
I'm trying to patch an old game (1998-ish) that runs on windows 95 and windows XP to make it compatible with windows 11.
The current problem with it is that when running the exe file nothing seems to ...
- 21
0
votes
1
answer
69
views
Tool to analyze .obj files (not COFF) created with /LTCG
This Microsoft article states that:
When building with LTCG, the compiler front end doesn't invoke the
back end. Instead, it emits an OBJ file with IL in it. It bears
repeating: this IL is not the ...
- 1,550
0
votes
0
answers
55
views
Pe file import binding
I'm learning a bit about PE files. The thing I've struggling a bit now it the First Thunk and Original First Thunk fields. To understand the difference between them I've read this post and that ...
- 115
0
votes
0
answers
76
views
windbg fail to load symbol with UNC store
I'm debugging a qemu windows machine in docker and the windbg shows the file is missing. Windbg is attached to qemu
kd> .sympath
Symbol search path is: srv*
Expanded Symbol search path is: cache*;...
- 313
1
vote
0
answers
90
views
Where can I find the files from Ghidra symbol tree?
I have decompiled a .dll file with Ghidra. At the left, I see the symbol tree. In the symbol tree, there is a tab imports. This tab contains external .dll files. Where can I find the location of these ...
- 83
2
votes
2
answers
210
views
How can I find the buffer of CryptGenRandom?
I am trying to analyze the CryptGenRandom algorithm on my Windows 10 laptop.
According to Niels Ferguson's Whitepaper called 'The Windows 10 random number generation infrastructure', the ...
- 83
1
vote
0
answers
82
views
Inject a MessageBox to the PE file
I'd like to patch some Windows PE file to show just simple MessageBox. Taking into account that the PE in question doesn't import the MessageBoxA function if I'm right that all i need to do is to add ...
- 115
0
votes
0
answers
34
views
How can I make a quick tracer for a PE file?
INTRODUCTION:
I made my tracer on the event debug loop, but after I compared its speed characteristics with the same PinTool or similar tools, I realized that my tracer is several dozen times slower ...
- 11
0
votes
0
answers
39
views
Firmware not attached to WinDBG while debugging Windows boot process
I'm attempting to reproduce the cve-2022-21894 poc for educational purposes, however I'm getting stuck at the "hvloader" phase. The debugger cannot attach to the boot process.
Short ...
- 11
0
votes
0
answers
59
views
How to inject (a lot of) code into a running program?
I've seen a number of tutorials on changing several binary digits of an executable, like changing assembly je to jn. But what I want to add new functionalities.
#include <iostream>
#include <...
- 133
0
votes
0
answers
23
views
Windows Library description number
Windows Libraries that engage in Library Hijacking, typically have a number in their library description field. What is this field? How does Windows Process it and is there a mapping of int32-like ...
- 1
1
vote
0
answers
57
views
Windbg command .call usage and syntax
I'm using Windbg to track all functions that could result in the blue screen errors. My method is to call certain suspects manually through windbg .call command. However, I always got syntax error. ...
- 313
1
vote
2
answers
158
views
Identifying file-access functions used by explorer.exe
I'm trying to write a Windows 10 64-bit rootkit that runs on userland and hides files using IAT hooking. I managed to accomplish that on cmd.exe by hooking FindFirstFileW and FindNextFileW imported ...
0
votes
0
answers
48
views
Emulation program broke because game updated from 32 bit to 64 bit
I have no idea who the developers of the emulator are; so I have no way to reach out to them for a fix.
I'm hoping to find someone here who would be willing to take a look at the emulator to see what ...
2
votes
1
answer
175
views
Marking DAT section as shellcode in ghidra
I have a binary that loads a DAT section as code (calls ((code **) DAT_something)(0, 2)), and I'd like to be able to disassemble the DAT_something data region. Currently, when looking at the ...
- 121
1
vote
1
answer
538
views
How can I extract the password from an installer/self-extracting archive?
I have an installer/self-extracting archive. The executable file has an embedded ZIP archive into it (like many other installers). The ZIP archive is encrypted with a password.
The installer DOES NOT ...
- 119
2
votes
1
answer
86
views
What triggers RIP_EVENT?
The documentation for the Windows Debugger API mentions a debug event called RIP_EVENT. It offers little explanation of what a RIP_EVENT is, only stating that the structure "contains the error ...
- 137
1
vote
1
answer
73
views
Should shell32.dll be in executable search path for winword.exe with WinDBG?
I'm threat hunting and I'm curious if there should be a shell32.dll in the executable search path in windbg for winword.exe.
1
vote
0
answers
69
views
How to develop an anti-debug library which allow users to debug their own programs but not the library?
I'm going to publish a library which guarded by anti-debug ,(ptrace_trackme for Linux and isDebuggerPresent for windows).
The down side of this library is: users would be abled to debug their own ...
- 81
2
votes
0
answers
54
views
i want to know how to tracing a exe's http responses and log them
I want to "crack" this cheat loader protected by thermedia and I had someone do it before but lost contact with them and, now I would like to learn to do it myself. and they said a basic way ...
- 21
2
votes
0
answers
64
views
Need help extracting AP_Pack .obb files
I'm trying to extract the files for the series of 4 games - Sorcery!, which are in the format .obb.
Thanks to a Hex editor I saw that the .obb was an AP_Pack, and looking for more information on the ...
- 21
2
votes
0
answers
29
views
How is the language of a font glyph determined?
A glyph holds data such as its name and contour points. But how do you determine where the characters of one language end and another begins? Is there a written standard that says language X starts at ...
- 21
4
votes
1
answer
112
views
Replacing a function in a 1995 Windows 32-bit binary using Frida causes crash
I am working with a 1995 Windows 32-bit binary compiled with Watcom, which uses the Watcom calling convention. I am trying to replace a simple string length calculation function in the binary using ...
- 191
4
votes
2
answers
210
views
Malware analysis - Debugger hangs at HttpSendRequestA
I'm reverse engineering a malware that at some point tries to connect to http://api.ipify.org in order to get the IP address of the infected PC.
I was able to replicate this behaviour with a small ...
- 298
5
votes
1
answer
117
views
Replace a function in a Windows 32-bit binary with a custom C function
I am reverse engineering a Windows game from 1995 using Ghidra, and I'm currently documenting all the decompiled functions. My goal is to replace a function in the original binary with a custom C ...
- 191
4
votes
3
answers
359
views
Help disassembling a simple 16-bit NE function
I am currently attempting to reverse engineer a simple function from within a 16-Bit Windows 3.1 (NE) DLL, which from what I can tell is used to display a message box when required.
I would assume ...
- 165
3
votes
0
answers
118
views
How can I find out which system functions are used in applications using dynamic loading?
I'm trying to make an application that tries to hook a specific function. but I realized something while working, I can't hook functions of applications that use dynamic loading using the detours ...
- 31
2
votes
0
answers
40
views
WinDbg Preview search is not returning results
I am attempting to manually unpack a malware sample. I am using the new WinDbg Preview (only thing that is available to download now). After letting the malware call VirtualAlloc I am trying to search ...
- 131
0
votes
0
answers
62
views
Why is Windows 10 still blocking me from running malware?
I am analyzing some malware on Windows 10. I installed FLARE VM, disabled tamper protection and disabled the virus scanner in the registry. However when I attempt to run a malware, Windows is still ...
- 131
1
vote
0
answers
162
views
IDA pro Error how to resolve this error
52C187F5: The instruction at 0x52C187F5 referenced memory at 0x4. The memory could not be read -> 00000004 (exc.code c0000005, tid 672)
How to solve this?
I have seen sandbox reports in those the ...
- 31
4
votes
1
answer
471
views
Reverse engineer DPC Latency Checker tool to fix high Windows kernel timer latency
I need help with something very Windows/kernel-specific.
I'm working on a fix for the high Kernel Timer Latency in Windows 10 2004 and higher. This problem was introduced between Insider Build 18950 ...
- 41
2
votes
0
answers
41
views
How does Windows Updates determine if the patches are compatible?
I am looking into Microsoft Windows updates, and how they are applied, after extracting the .msu file, we get some .cab files with patches (in PA30 format), and informations on the file attributes, ...
- 151
4
votes
1
answer
107
views
Windows 11: Interact with IDA pro when running in session 0
I am trying to debug a windows service, so I set IDA as the debugger of that service.
But since services are running in session 0, I can't interact with IDA. Also in the latest windows version (e.g. ...
- 53
3
votes
1
answer
108
views
The same notepad.exe runs in both WoW64 and x64 modes
When I run notepad.exe with x64dbg it runs as WOW64 process. But when I run it with x32dbg it runs as x64 process with x64 instructions. I am running it from the same directory C:\Windows\System32\...
- 31
5
votes
1
answer
293
views
Why is function in kernel32.dll jumping into a api-ms-win-core stub
I was trying to look into the implementation of GetVersion function in kernel32.dll.
I was surprised to see that the GetVersion thunk is issuing a jump to API-MS-WIN-CORE-SYSINFO-L1-1-0.DLL::...
- 205
3
votes
1
answer
81
views
How does this Is64BitOS pointer-arithmetic-based function work?
Reversed this function. It works. But stepping through I can't figure out how. Why does this work?
bool _Is64BitOS(void) {
unsigned int version = *(unsigned int*)0x7FFE026C;
unsigned int ...
- 155
2
votes
1
answer
67
views
Capture and Replay
I was wondering if it was possible to create a python script that is able to capture and replay the instructions executed by a windows program for in depth analysis.
- 49
4
votes
2
answers
463
views
Forcing a legacy Windows application to use an older version of ntdll.dll
There is this old Windows application I've been using for more than a decade now: DesktopEarth. It got its last update in 2015 and the author's website is offline now, but it's been running fine on ...
- 141
2
votes
1
answer
186
views
How to access files stored in mouse?
I own a Razer Mamba Elite mouse. After plugging it in to the usb port, an software installation window shows up. Basically it's the Razer software to manage device's options such as profiles, macros, ...
- 21
2
votes
0
answers
125
views
How to decrypt data during runtime before executing and then encrypting it back
I was doing some research and came across the term protectors. From my understanding is they encrypt a file to be protected but run it without an issue. During its execution it is able to decrypt the ...
- 21
2
votes
0
answers
66
views
What is the following code will do after modifying it? [closed]
The following commands will change the files information gatherosstate.exe file. From looking at the hex values I can interpret that there are nop (0x00). The file changed in windows terminal.
But ...
