All Questions
887
questions
0
votes
0
answers
32
views
Is there a library to reassemble and rebuild Windows PE binary? [closed]
I want to disassemble a x64 PE binary, add my own inline assembly code somewhere inside the .text section (or any other executable section), and then assemble the binary back and expect it to work.
I'...
- 13
1
vote
1
answer
82
views
What is the difference between these two functions in x64 assembly?
I'm playing around with lower level stuff in C on Windows (x64) to try and learn low level concepts. I ran across something I don't understand and just wonder if someone could explain something to me....
1
vote
0
answers
31
views
Link function calls against reverse engineered binary
I created an windows x86 .exe file that I reverse engineer. Imagine I only have the .exe file and I reverse engineered some functions.
The goal is to create a dll that links with this .exe so the dll ...
- 26
-1
votes
0
answers
25
views
Writing x64 nasm assembly for windows [duplicate]
I would like to learn how to write x64 nasm assembly for windows but I can't find any resources for that.
And also how to compile the assembly into executable program.
So if anyone knows of a ...
- 1
1
vote
0
answers
55
views
Whis is this x86_64 AT&T assembly failing, i think foo: is the culprit?
Here is the assembly, I am using Windows 11.
Assembling: as .\test.S -o test.out
Linking: ld -o test.exe -subsys=console test.out -L "C:\TDM-GCC-64\x86_64-w64-mingw32\lib" -lmsvcrt
When i ...
- 86
1
vote
0
answers
34
views
VS2019 MASM64 x64 windows assembly CreateFileMapping [duplicate]
I would like to ask how to use the CreateFileMapping function in x64 assembly.i use vs2019 masm64, I'm having trouble with it.LINK error lnk2019 unresolved external symbol CreateFileMapping.
My code ...
- 11
0
votes
0
answers
57
views
How do buffer overflows execute instructions on stack?
I have read a bit about buffer overflows, one thing I don't understand is that normally space isn't executable to my knowledge, how can code placed in it be run?
- 555
0
votes
0
answers
37
views
How to multiply structures among themselves
I need to multiply the structures among themselves and write the result into a separate one. The problem is that after multiplication it is impossible to transmit the result. If I transfer the result ...
- 11
0
votes
0
answers
15
views
SetWindowPos didn't change command prompt size
I want to change the size of the command prompt. Below is my code. Although it runs, the size doesn't change as intended. What could be the issue, and how can I resolve it? Alternatively, are there ...
- 21
0
votes
1
answer
49
views
Manual syscall gives STATUS_ACCESS_VIOLATION
Im trying to call NtAllocateVirtualMemory using the syscall instruction but it returns the error STATUS_ACCESS_VIOLATION
I tried running it as administrator but it gave me the same error. Im expecting ...
- 21
0
votes
0
answers
38
views
Killing a process using TerminateProcess
I am writing a program on MASM64, the goal of the program is to launch the calc.exe process (a regular Windows calculator) and after 10 seconds complete this process. I expect the program to close ...
- 11
0
votes
0
answers
85
views
How to dynamically get operands from a instruction in memory in c++
Im trying to read a instruction from another processes memory and get the operands dynamically. For example if the instruction is MOV how can i know that it has 2 operands?
The process is x64
I tried ...
- 21
-1
votes
1
answer
58
views
"junk at end of line" when assembling .s file compiled from C++ file using Clang and LLVM, but works with C file
I am learning how to use the LLVM toolchain. I have a .cpp file, and I'm trying to compile it to an LLVM bitcode file, compile the LLVM bytecode file into an assembly file, and then assemble the ...
- 472
1
vote
1
answer
134
views
How to call a ASM function from c++
Im trying to call a ASM function from c++ but I get the error unresolved external symbol referenced
my c++ code:
extern void foo();
int main() {
foo();
return 0;
}
my asm code:
section .text
...
- 21
0
votes
0
answers
43
views
Windows 64-bit NASM - Why does this code not print anything, when using a variable? [duplicate]
Hello I have the following code:
extern GetStdHandle, WriteConsoleA, ExitProcess
section .text
_main:
mov rcx, STD_OUTPUT_HANDLE
call GetStdHandle
mov rcx, rax ; hConsoleOutput
...
