Author: Daax Rynd

Applied Reverse Engineering: Accelerated Assembly [P2]

Overview After reading feedback from the first part to the Accelerated Assembly guide, I’ve decided to take on a custom target, and call back to high-level languages when we encounter obscure or new pieces in the assembly. I realize that the level of detail in my last article may have been cumbersome to some readers, […]

Read More

Applied Reverse Engineering: Accelerated Assembly [P1]

Overview In this article you’ll be guided through a course on the x86 Instruction Set. This article serves at as a quick fix to the problem of not knowing where to start when learning Assembly. We’ll be covering instruction format briefly, and then jump right in to the instructions. This is like learning another language, […]

Read More

Applied Reverse Engineering: Exceptions and Interrupts

Overview To continue learning important topics within the OS and architecture, and before diving into the deep end of the application, we’re going to cover a topic that is relevant to reverse engineering and development in general: exceptions and interrupts. In this article, you’ll learn about exceptions/interrupts from the ground up. What they are, the […]

Read More

Applied Reverse Engineering: The Stack

Overview This article is written for new reverse engineers who have a hard time understanding the stack, its layout, how it works, and the various requirements for proper function. It can be a confusing concept to wrap your head around at first, but after reading this article you should have a very deep understanding of […]

Read More

Applied Reverse Engineering: Basic Architecture

Overview Thanks for joining me in my newest series Applied Reverse Engineering. I decided to write this new series concurrently with the EPT series except I pushed out the first five for this one and haven’t started the other. Typical. Anyways, I have to give a little preface to the article and series as well […]

Read More

Applied Reverse Engineering Series

Series Overview This series is intended for readers who are interested in reverse engineering but have only opened a debugger a handful of times. If you have trouble with certain concepts of reverse engineering, tooling, disassembly or debugging then you’ve come to the right place. Starting from the ground up we’ll work our way to […]

Read More

Day 5: The VM-exit Handler, Event Injection, Context Modifications, and CPUID Emulation

Overview In the last article you learned about the VMCS, initializing the VMCS, segmentation and made a skeleton of the VM-exit handler. It was a long read, but if you’re here reading this now you’ve made it through the most time consuming part. Now we get to start interposing on system operations at a whim, […]

Read More

Day 4: VMCS Initialization, Segmentation, and Operation Visualization

Overview A quick apology for the extended delay of this series. It is my intention to continue this series at Day 4 with a lot of newfound knowledge to share with the readers. I hope that with the last 6 months those of you who had taken an interest in this series were able to […]

Read More

Day 3: The VMCS, Component Encoding, and Multiprocessor Initialization

Overview This article will be presenting a lot of different information. The first section will be over multiple-processor initialization, the different processor classes and how they’re referenced throughout the post, and a variety of other multi-processor related information. I’ll also demonstrate the MP initialization protocol for the hypervisor we’re creating in full detail using what […]

Read More

Day 2: Entering VMX Operation, Explaining Implementation Requirements

Overview Today is the day of heavy details and implementation. There will be a lot of technical explanation and a lot of text. We’ll start off with a section explaining the need for some form of internal logging API because – well, having DbgPrint spammed throughout functions when validating certain control values is disgusting and […]

Read More