Questions tagged [nasm]

Question 1

What I want to do What I want to do is inject an existing ELF binary with additional code that runs before the original .text section and then transfers control back to it. What I can already do Now, ...

Question 2

I'm new to reverse engineering, assembly and IDA and I'm learning NASM. Whenever I load an executable (a PE file or an ELF) IDA disassembles it using a MASM-like syntax (it looks to me that it does) ...

Question 3

I am using NASM(2.15) assembler to generate code. But I am unable to figure out why it does not show output in the console(windows system) when using int3 - software breakpoint, it only shows output ...

Question 4

I am new to reverse engineering and want to analyze my own exe/dll files. I took a look at nasm and masm and so far I have the feeling that this is unnecessary for me to learn in detail because it ...

Question 5

My title is kind of ambiguous and not sure if it is true, Hence the question mark at the end. Basically, I was trying to trace windows printf in NASM to identify "what is the last call/function ...

Question 6

I'd like to know why NASM generates different opcodes for the same code, when it's in the begin or end of the program? This question is important because I found NULL characters when I compile the ...

Question 7

Looking at an assembly code snippet I see: lea rax, [rbp-0x50] Which tells me that the rax register now points to whatever value is in rbp-hex(50). Question. Would I achieve the same result doing ...

Question 8

I am trying to reassemble code reversed from an executable using radare2. I have managed to extract the asm and am using nasm for reassembling. The question is, the code also contains commands like ...

Question 9

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 ...

Question 10

the code is: .global asm0 asm0: push ebp mov ebp,esp mov eax,DWORD PTR [ebp+0x8] mov ebx,DWORD PTR [ebp+0xc] mov eax,ebx mov esp,ebp pop ebp The entry is: asm0(0x2a,...

Question 11

Consider the following code: In C++: SomeClass* globalPointer; // we don't know what it points to, but it's not null a pointer, it's initialized void someFunction() { globalPointer->...

Question 12

I see word NASM, MASM, Intel, AT&T. I am confused between them. Is it different types of assembly?

Question 13

I assembled a simple objective-c file that prints hello to the screen. this is the code: #import <Foundation/Foundation.h> int main() { NSString* a = [NSString stringWithUTF8String: "hi"]; ...

Question 14

I have a basic XOR decoder that functions perfectly in Linux, but when I try to move it over to an exe in windows, it fails. I am leaving this question open for historical reference since the issue ...

Question 15

Should I be able to extract shellcode from a basic (tested and working) Win7-64 message box app and place the extracted shellcode into a tested and working assembly language encoder/decoder and expect ...

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Questions tagged [nasm]

Inject ELF with an entierly self-contained code section that can statically call standard library functions

How can I make IDA disassemble in NASM-like syntax instead of MASM-like syntax?

Why output is disabled in console when using int3?

Starting out with reverse engineering. What assembly is disassembled code

far jump do not point to instruction?

NULL character (same code) different locations

What is the difference between MOV and LEA in example?

Reassembling reversed ASM

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

Inversion of input parameters in ASM

What's the meaning of dword_XXXX and offset dword_XXXX in IDA?

NASM, MASM, Intel, AT&T' syntax?

Objective-C disassembling - I dont understand this code

How to Make .text Section in Assembly Writeable for Win7-64 EXE

Working Linux assembly XOR Encoder/Decoder Failing on Windows

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