Recently I found a malicious PHP payload on my company's server. The code seems to be encoded into two strings claster and x64. The claster string decodes to th
I'm currently writing a virtual machine and I've realised that 0xBB is not a valid instruction when it should be. I tried using shellstorm wit
i have a some simple lines of code in C and wanted to disassemble it: #include <stdio.h> int main(){ int i=42; } After compiling it and starting gdb, i
I have written a PROC to find all odd numbers. I want to transition the existing code into a prime number generator. The intent of the entire program is to take
(1) I wonder if the is register the only place the arithmetic calculation can happen? It looks like: add BYTE PTR [var], 10 — add 10 to
I've been writing assembly on linux for a while and I often find myself in need of including C headers which contain macro, enum and struct definitions (but cle
I'm learning how to use masm using MS's official docs, but there's almost nothing written on the option directive (https://docs.microsoft.com/en-us/cpp/assemble
#include <stdio.h> extern int count(char *string, char c); int main(void) { char s[100]; char c; printf("Enter a string of characters:\n"); scanf
I've been writing some x64 assembly on linux - exactly what it is is not relevant - and I've come across a strange problem. In my assembly code, I've declared p
What exactly is Program Segment Prefix (PSP)? I searched in Google but couldn't find any clean and straight answers to help me completely understand it. What d
#include <stdio.h> #include <iostream> #include <string> #include <chrono> #include <memory> #include <cstdlib> #include <
I downloaded a modification for a 20+ year old game I play, which is written in assembly code. It adds a fog effect, and then varies the grip levels based on th
Our internal program is written in C and makes extensive use of snprintf() for many pieces, and I noticed that during debugging with perf record/report, it's sp
I'm taking a course on computer structure and I'm lost. I was given the following file: Hello.s: #This is a simple "Hello World!" program .section .rodat
I was reading this article " assembly-challenge-jump-to-a-non-relative-address-without-using-registers ". I need to do exactly what he suggests here (Jump to a
Hi all i am converting my C code to MIPS but problem is here i couldn't make correct logic for this for (int i=0;i<count;i++) { h[a[i]]++; } as
When studying assembler at the university, I encountered the following problem: I have 3 files (all of them oversimplified, they were much bigger): main.asm .58
I'm developing a microkernel for my personal research. I have chosen to run my kernel at 0xf0000000, leaving 3.75 GiB for user space programs. When my kernel st
I try to call my function just like the example code: use std::arch::asm; extern "C" fn foo(arg: i32) -> i32 { println!("arg = {}", arg); arg * 2 }
I couldn't find much information or specification that suits me, so I have no choice but to ask here. When we call some function with the call instruction and t