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About the Author:

Dejan Lukan is a security researcher for InfoSec Institute and penetration tester from Slovenia. He is very interested in finding new bugs in real world software products with source code analysis, fuzzing and reverse engineering. He also has a great passion for developing his own simple scripts for security related problems and learning about new hacking techniques. He knows a great deal about programming languages, as he can write in couple of dozen of them. His passion is also Antivirus bypassing techniques, malware research and operating systems, mainly Linux, Windows and BSD. He also has his own blog available here: http://www.proteansec.com/.

Hello World: C, Assembly, Object File and Executable


Summary: In this article we’ll take a look at the C program that prints “Hello World!” to the screen, which we’ll assemble and compile. Then we’ll compare the results […]


Pen Testing Domain Controllers


When performing a penetration test, we’re constantly stumbling upon various servers that support domain logins into the customers network. We’re allowed to login if we know the username and […]


Sniffing Network Traffic on Android


There has been a lot of talk about how to connect your laptop though the Android network and use the bandwidth that you’re already paying for. Usually, this requires […]


Reverse-Engineering Arrays


Whenever we would like to reverse-engineer a function, we need to know exactly how the function is being called: its calling convention, number of parameters, parameter types, parameter values, […]


Reverse Engineering Structures


In this part of the tutorial, we’ll take a look at how we can figure out a structure when reverse engineering a binary. First, we must write a C++ […]


Google Hacking with GGGoogleScan

When scraping the Google search engine, we need to be careful so that Google doesn’t detect our automated tool as a bot, which will redirect us to a captcha […]


The Basics of IDA Pro

1. Introduction

IDA Pro is the best disassembler in the business. Although it costs a lot, there’s still a free version available. I downloaded IDA Pro 6.2 limited edition, which […]


Calling Conventions


Calling conventions are used by all programs without the user even realizing it. But before saying more about them, we must first make sure we understand what happens when […]


Android and Java Native Interface

Java Native Interface (JNI)

JNI is a native programming interface supported by Java and is part of the Java SDK. With JNI, we can write code in other languages like […]


Using Sandboxes For Hostile Program Analysis



If you’re reading this article, you have probably heard of a sandbox before. But, in case you haven’t, I’ll provide a quick explanation of what a sandbox really is. […]

malware analysis

Analysis of Malware Samples with the Immunity Debugger API


Immunity Debugger is a debugger which is very much like Ollydbg. In this tutorial we’ll present the Python API that Immunity Debugger uses for writing the plugins. Ollydbg has […]

Abstract background with binary code.

API Hooking with Microsoft Detours


Microsoft Detours is a library which we can use to build our own DLL that serves as an API monitor when analyzing the results. The best thing about it […]


Web Vulnerabilities Explained


We all know that vulnerabilities in web pages are quite common these days. They range from SQL injections, XSS vulnerabilities, CSRF, etc. In this article we’ll provide basic examples […]


WordPress Plugin Vulnerabilities: From a Developer’s Point of View

1. Introduction

We all know the prevalence of the WordPress blogging system and its share of vulnerabilities in the core system alone over the years. If not, we can take […]


Getting Domain Information

1. Introduction

When analyzing malware we can gather a lot of information just by identifying the IP addresses and domains the malware software uses. Most malware software programs use DNS […]


Environment for Malware Analysis


Before trying to analyze any kind of malware, we need to have a proper environment set up, so we can be most efficient and collect the most information from […]


Analyzing Malicious JavaScript

1. Introduction

Nowdays there are various threats in the wild that want to get malware installed on victim operating systems. Most of them use some kind of social engineering bundled […]


PDF File Format: Basic Structure

1. Introduction

We all know that there are a number of attacks where an attacker includes some shellcode into a PDF document, which uses some kind of vulnerability in how […]


Wfuzz and WebSlayer

1. Introduction

WfFuzz is a web application bruteforcer that can be considered an alternative to Burp Intruder as they both have some common features. With both Wfuzz and Burp Intruder […]


Network Topology

1. Introduction

Whenever we’re doing a penetration test, it’s good to figure out the topology of the network we’re testing. We can’t figure out the whole topology, because we don’t […]