Linux X86 Assembly - How To Test Custom Shellcode Using a C Payload Tester
Overview In the last blog post in this series, we created a tool to make it easy to build our custom payloads and extract them. However, what if we...
Linux X86 Assembly - How To Make Payload Extraction Easier
Overview In the last blog post of the X86 Linux assembly series, we focused on how to make our Hello World payload friendly for use as a payload in...
Linux X86 Assembly - How to Make Our Hello World Usable as an Exploit Payload
Overview In the last two tutorials, we built a Hello World program in NASM and GAS for x86 assembly. While this can help us learn x86 assembly, it...
Linux X86 Assembly - How to Build a Hello World Program in GAS
Overview In the last tutorial, we covered how to build a 32-bit x86 Hello World program in NASM. Today, we will cover how to do the same thing, but...
Linux X86 Assembly - How to Build a Hello World Program in NASM
Overview A processor understands bytecode instructions specific to that architecture. We as humans use mnemonics to make building these instructions...
A Hacker’s Tour of the X86 CPU Architecture
Overview The Intel x86 CPU architecture is one of the most prolific CPU architectures for desktops, laptops, and servers. While other architectures...
LD_PRELOAD: How to Run Code at Load Time
Today I want to continue the series on using LD_PRELOAD. In previous posts, we covered how to inject a shared object binary into a process, and...
Converting NMAP XML Files to HTML with xsltproc
NMAP is a wonderful network scanner and its ability to log scan data to files, specifically XML, helps quite a bit. This enables the scan data to be...
Solving the November 13th Detective Nevil Mystery Challenge
Overview Each week on Friday, we post a social media challenge known as “Detective Nevil Mystery Challenge”. On November 13th of 2020, we released a...
Not-So-Random: Using LD_PRELOAD to Hijack the rand() Function
Today I wanted to continue the series on using LD_PRELOAD. In today’s post we are going to use LD_PRELOAD to hijack the rand() function in a...
LD_PRELOAD - Introduction
Today I wanted to start what I plan to be a small series of blog posts about LD_PRELOAD. LD_PRELOAD is related to Linux based systems and...