Writeup: The SANS HOLIDAY HACK CHALLENGE 2021 – Kringlecon 4 CALLING BIRDS!

It’s that time of the year again, to reveal my writeup for the Sans Holiday Hack Challenge. This time around Sans named the game “Kringlecon 4 – Calling Birds!”. My last year submission resulted in an “Honorable Mention”. Since I have had major issues with documenting massive writeups using WordPress , I have decided to

Writeup: The SANS HOLIDAY HACK CHALLENGE 2020 – Kringlecon 3 French Hens!

It’s that time of the year again, to reveal my writeup for the Sans Holiday Hack Challenge. This time around Sans named the game “Kringlecon 3 – French Hens”. My last year submission resulted in an “Super Honorable Mention”. This year I got an “Honorable Mention” under my own name. Since I have had major

Writeup: The SANS HOLIDAY HACK CHALLENGE 2019 – Kringlecon 2 Turtle Doves!

It’s that time of the year again, to reveal my writeup for the Sans Holiday Hack Challenge. This time around Sans named the game “Kringlecon 2 – Turtle Doves” and featured lots and lots of blue team related objectives. During the game I became good friends with Splunk, Graylog and various other neat tools. Since

Writeup: The SANS HOLIDAY HACK CHALLENGE 2018 – Kringlecon

The most beautiful event of 2018 has ended. Kringlecon is over! I’m a bit sad about it because the game was just so good this year! There were plenty of interesting tasks and objectives. Everything from simple assignments such as breaking out of VI to tearing apart and analysing a malware! Heck, you even had

Notes on making CTF games

Some time ago I wrote a post named “unofficial guide to creating CTF VMs“. Since then I have been approached by random people, students I mentor and colleagues asking how to make that virtual machine vulnerable. Well, I never intended that post to reveal that. It was simply left as an exercise to the readers. Today I

DonkeyDocker 1 – Walkthrough

This writeup covers the Vulnhub CTF game DonkeyDocker 1 (2017), which might be the most interesting game I have played this year. In this game players are to play with Docker – a task that lies close to my heart since I love this technology. Although I am bit rusty on it ever since I

Ew_Skuzzy 1 – walkthrough

Today I am sharing my work log for the “Ew_Skuzzy: 1” CTF game. This game was released only recently, on the 17th of March 2017. As of time of writing, there haven’t been much information released about it. That adds another dimension to solving it and suits me fine. As always I have based my

An Unofficial Guide to Creating CTF VMs

Today I am going to shed some light on how to create a virtual machine for CTF gaming. This tutorial came to life after a discussion on my Discord server on how to distribute CTF games among friends. In this tutorial we’ll create a Debian based virtual machine, prep it with some software – then