Questions tagged [windbg]

A graphical stand-alone multipurpose debugger for Microsoft Windows, distributed on the web by Microsoft.

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WinDBG doesn't resolve function names when debugging kernel module

I am debugging a kernel driver. When I set a breakpoint with WinDBG in one of its functions but it doesn't complete the function names while on IDA it shows the names (statically). Here is a picture ...
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1answer
80 views

Trying to reverse engineer CmpFindNlsData of winload

I have a basic understanding of assembly language and I'm unable to perfectly define the algorithm of winload!CmpFindNlsData looking at the disassembly. Basically I need to understand how NLS data is ...
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Connection to Microsoft Symbol Server reset in windbg

I'm using windbg version 6.12.0002.633 X86 on Windows XP SP3 in a VM. I've configured the environment variable, _NT_SYMBOL_PATH as shown below: _NT_SYMBOL_PATH=symsrv*symsrv.dll*c:\symbols*http://msdl....
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31 views

Is there an event log to check when WinDbg kernel debugger fails to attach on OS load?

I'm using the latest WinDbg (Preview) to do kernel debugging on a Windows 10 client (v 1909) via a network connection in a VM. And I'm wondering if there's a log that the kernel debugger maintains? I ...
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0answers
24 views

WinDbg pattern search not returning expected result

I'm searching for a string, say the old "This program cannot run". Switching context to e.g. notepad, non invasive, with page translation 1: kd> !process 0 0 notepad.exe PROCESS ...
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0answers
18 views

Find the caption of VB5/6 Form Object in Memory Dump

I'm looking at a problem with app that has lost source code and the app crashes shortly after calling code that appears to be [Global Variable representing Form Object].ZOrder 0 (i.e. trying to make ...
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27 views

bad memory mapping in case of MEMORY dump IDA <-> WinDbg

when I open the debug dump (IDA x64) , I don't have the memory ranges. Exactly like in this question: ESP out of range of "Stack View" in IDA It used to be fine, but I don't have the menu ...
2
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1answer
70 views

Get return address from syscall

I'm debugging some 32-bit process using windbg kernel debugger. This process calls some syscalls, so I set few breakpoints at kernel functions like nt!NtQuerySystemInformation. So after breakpoint hit,...
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1answer
95 views

Windbg: “gu” command inside of a breakpoint causes warning

I'm trying to leverage "gu" command in a conditional breakpoint or as a "CommandString" in a regular breakpoint. For example let's consider break on a malloc() function when we want to see in logs ...
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1answer
115 views

Getting NTSTATUS 0xC0000022 when attempting to debug a process

I am attempting to debug a process with windbg (with admin privileges) and I am getting the following error: Could not attach to process XXXX =, NTSTATUS 0xC0000022 {Access Denied} A process has ...
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49 views

Use WinDbg to bypass file open checks

I'm using an evaluation version of a program that opens custom filetypes (a combination of text/midi like a karaoke helper). The evaluation version will only open certain files bundled with it. When I ...
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30 views

Symbol Information on wcscpy_s in WinDbg - Why references across so many DLLs?

I am using Time Travel Debugging feature of WinDbg to log string output with position of trace to help me more easily isolate sections of codes I want to analyse, using command like below: bp ...
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1answer
342 views

How to calculate the size of a PE from headers?

What I am trying to do is calculate the size of a PE through it's headers. I am using WinDbg's Javascripting and in this case, it will mostly be for drivers. The idea is to dump a driver from memory ...
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1answer
91 views

How to find each interrupt's line in the Interrupt Descriptor Table

I'm trying to find the line number of the 0f05 syscall interrupt with no success. I searched everywhere and couldn't find any way of doing that, it seems like this information is hard coded in the ...
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2answers
156 views

Disassembling only given function

I'm looking for some disassembler that has feature similar to WinDbg uf function, it produces output that is really easy transferable to compilable NASM listing. The problem with WinDbg is that it's ...
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104 views

Issues with Symbols when running windbg on windows xp sp3

I have been trying to debug a crash using windbg on windows xp sp3. I have been getting the below error while trying to debug. I googled around and found the Microsoft no longer offers symbols exe as ...
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1answer
447 views

Remote debugging using IDA, connecting to windbg server (kernel mode)

I do kernel debugging by using a virtual com port. One machine (host) is debugging the other machine. I have a remote machine that has IDA, and I wish to connect to the debugging session in the host ...
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2answers
79 views

Predicting Memory locations of arguments within a function

I'm trying to write a script that would help display the memory contents of the arguments passed within a function. For example, in the function below, the first argument starts at the EAX register. ...
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1answer
45 views

What does -c mean in this Windbg Command Syntax?

kd> u win32k!impPsIsThreadTerminating+0xe4-c L5 | \ \ \ \ \ / \ \ \ \ \ / \ \ \ \ \ ...
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2answers
727 views

x64dbg (x32dbg) log registers every step like windbg

So I just switched to x64dbg (really using x32 atm) from windbg and so far I like it but the one thing I'm missing is windbg printing all the registers every step in the command window. Anyone know ...
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1answer
164 views

Setting a conditional kernel breakpoint in WinDbg grinds the debuggee OS to a halt

My setup: Debugger: Win10 Pro, WinDbg Preview v.1.0.1904.18001 Debuggee: Win7 Pro (running in a VM using VMWare Workstation) I'm trying to follow the SendMessage call from the user space: Into the ...
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1answer
4k views

How to configure IDA to load .pdb files from Microsoft public symbol server?

I've done this in one VM but I can't seem to replicate it in another. I'm using IDA to analyze a 32-bit Windows PE file. I then want to step thru it with a WinDbg debugger from within IDA. So when I ...
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1answer
131 views

How to call WinApi from a breakpoint in IDA Pro?

When I'm stepping through a debuggee process with IDA+WinDbg (as a debugger), I need to track one parameter by executing the following API (from within the breakpoint): //C++ code SCROLLINFO s; s....
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1answer
307 views

Analyzing Windows kernel driver

I'm trying to analyze some Windows kernel driver. What I want to achieve is full execution trace, from driver entry to end point. Driver is heavily virtualized and contains multiple anti-debugging ...
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0answers
49 views

WinDbg does not shows all first chance exceptions

I have an application, which sometimes fails. I run procdump and see some first chance exceptions like this: [14:29:38] Exception: E06D7363.?AVCServicesMDException@@ [14:29:38] Exception: E06D7363.?...
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2answers
837 views

windbg - Why does the GS register resolve to offset 0x0?

I'm trying to understand how to resolve segment addressing (specifically the GS register in X64). My toy program: int main() { unsigned long long x; __debugbreak(); x = __readgsqword(...
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1answer
562 views

windbg - What is the relation between the VAD (!vad), the PTEs (!pte), and loaded modules and sections (lm and !dh)?

[cross-posted (but closed the original) from https://stackoverflow.com/q/55438806/254959] I'm trying to gain a better understanding on Windows process memory, and have some gaps with regards to the ...
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1answer
439 views

Detecting protected processes and critical processes from windows driver

I've got a driver that tamper user-space processes by sending APC calls upon process start using the call PsSetCreateProcessNotifyRoutine. I wish to avoid tampering with any process that is critical ...
3
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1answer
449 views

How to use windbg to view assembly code of kernel function?

I am using windbg for local kernel debugging. I want to view the disassembly of a kernel function (eg. AuxKlibQueryModuleInformation). I am not familiar with kernel debugging. Please help me do this.
2
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1answer
633 views

Debugger Win32 Local vs WinDbg in Ida vs Ollydbg

When I do dynamic analyze of exe file I have few option , and I want to know what are the advantages and disadvantages. I know that Ida designated for static analyze , but there are some debugger in ...
2
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1answer
142 views

Why IDA can't find the function named by windbg

This is definitely a beginner question,I'm doing static and dynamic analysis on certain dll file and the WinDbg give me call stack like SERVER+0x78123 When I return back to IDA to see the code ...
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1answer
69 views

Windbg Break Points

I need to set a break point when a specific module address space is being overwritten? I need to specify this by module name not address space
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1answer
93 views

Windbg's “dt” equivalent in IDA?

I wanted to ask whether there is a simple way to see an object's structure (like windbg's "dt" command equivalent)? Assuming of course I have the pdb file. Thank you :)
4
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2answers
95 views

Are some special chars(<>) in function names not supported by windbg/cdb?

I have a function in a binary like this class<class1::class2>::function. I can't directly use commands like bp, u, x on the function. The only option I have right now is x class* and then look ...
0
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1answer
843 views

How to breakpoint atached process with ida when move on

In IDA pro, there is an option to attach to a process using the WinDbg backend. When I want is to see the process' control flow when the IDA attaches to it. The only way (that I know) to see the ...
2
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0answers
84 views

Ignore some locations in Windbg Conditional breakpoints

I'm trying to set a conditional hardware breakpoint on Windows Kernel-Mode in Windbg by using the following syntax : ba w1 ffff802312345678 "j(@rip==ffff802387654321 || @rip==ffff802387654330) 'gc';''...
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2answers
1k views

What is the difference between Windbg and local debugger in IDA

When I want to debug an .exe on Windows with IDA I can choose between Windbg or local debugger. What is the difference? By the way, is there any difference if I use Windbg tool (windows software) ...
3
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1answer
627 views

Question about the limit and base address in x86-64 segmentation model?

I'm trying to understand how segmentation works under x86-64. From what I see, it's mostly disabled, but not entirely. It looks like GS and FS registers are still using it. So I was reviewing the ...
2
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2answers
828 views

Can I set more than 4 memory access breakpoints in WinDbg?

I can set a DWORD memory read/write access breakpoint in WinDbg with the following command: ba r 4 0x0307F42C But is there a way to set more than 4 of those?
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0answers
847 views

Windows 10 v.1803 boot failure after trying to install network kernel debugging with WinDbg Preview

I'm trying to set up kernel debugging on a physical hardware/desktop to test the new WinDbg Preview. Here's the steps: I'm using a desktop with Intel DG41TY board. Installed Windows 10 Pro build 1803....
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0answers
156 views

Prevent windbg from context switching when stepping into assembly instructions

When I'm using Windbg (in kernel mode) to step into assembly, I would encounter context switching once in a while - which is annoying. So, for example, I placed a breakpoint for a process - let's ...
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3answers
947 views

WinDbg: Setting a breakpoint on every EXPORTED function of a module

Kinda new to WinDbg. I got an executable who loads a module later in the execution path, so at start I'm doing sxe ld:moduleName to break when the process loads the module. Then I tried to just put a ...
2
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1answer
713 views

Windbg: How to directly view GS:[0x60]

Win10x64: In Windbg, how may I view a pointer to the PEB by directly using GS:[0x60] (and not by Windbg extensions)? To test, I assembled a program via masm64 that throws an interrupt, clears r8 then ...
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1answer
504 views

Break on driver loading with windbg

I try to debug a driver used by malware ( without source code of course ), to see what IOCTLS it uses and for what. I have issues breaking on driver loading, it has a proper driver structure, with ...
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1answer
2k views

Tracing function calls in x64dbg

I'm new with x64dbg and want to know if there is any way to get the trace of a functions inside a module? I've used trace over option, but basically it just traces all the insturctions but doesn't "...
2
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1answer
786 views

How to find the name of the method in Managed Code using Windbg and SOS?

I've got a crash dump, the application definitely crash in JIT optimized assembler code. I know the start address of the method. How do I find its name using using Windbg and SOS extension? Currently ...
2
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1answer
129 views

Is there a command in Windbg which prints MINIDUMP_MISC_INFO_N from the Windows mini dumps?

There's time zone information in windows dumps stored in MINIDUMP_MISC_INFO_N, yet I couldn't find the command which prints this information in windbg. So, I have to extract this information from the ...
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1answer
287 views

How to set bp in a dll which loads later in pykd?

I am using pykd to debug an application which loads a dll only when some condition is met. How do I set a breakpoint in the dll which has not loaded yet in pykd such that my handler gets the callback? ...
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1answer
4k views

[windbg]kd - sxe ld <dll> from a process context won't fire

I'm trying to stop at a specific module load from a kernel debugger inside a specific process context. What i do is to first set sxe ld [process-name] let's say calc.exe. Now, when I run calc it ...
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0answers
125 views

Adobe Reader JIT Pages

I use Adobe Reader XI for a little research project. I know that Adobe use SpiderMonkey as its JS engine. When opening a .pdf file that contains JS, the JS code is compiled in runtime in parts (JIT)...