Publications

RM -RF IS THE ROOT OF ALL EVIL

There are some days where things do not go your way. And there are some other days where they go catastrophically wrong. Several months ago, I had the unfortunate experience of wiping 2 years of my work. This blogpost explains why this tragedy happened and what I did to recover some critical data from the ashes of my SSD.

Izi Izi, Pwn2Own ICS Miami

ZDI announced last year a new entry in it's yearly contest "Pwn2Own". After the Vancouver edition focused on Desktop software and Tokyo specialized in smartphones, there is now a third location in Miami dedicated to industrial software also known as ICS or SCADA.

SharkyCTF - EZDump writeups / Linux Forensics introduction

This weekend was held the Sharky CTF, organized by students of ENSIBS. A series of 7 forensic challenges concerning a same machine memory dump was proposed. They make a great introduction to memory forensic in Linux, from the creation of a specific Volatility profile, to the reverse engineering of a rootkit installed on the machine. Stay sit, here is the writeup!

Advent ctf 2019 overthewire - day2 writeup

The advent ctf organized by overthewire proposed various challenges that would unlock on a daily basis (like an advent calendar). I found day number 2 (made by hpmv) quite challenging and super fun to solve! It involved crypto, network and rev in a blackbox environment. The full source code used to solve this challenge is available here https://github.com/majin42/adventctf_otw_day2

FIC2020 prequals CTF write-up

We took part to FIC2020's prequals CTF, organized by the French team Hexpresso with a team made of @dzeta, @laxa, @swapgs and @us3r777. We managed to finish second, so here is our writeup!

BFS 2019 Exploitation Challenge

On September 7th, 2019, BFS published an exploitation challenge on Windows 10 x64 to win an entry for the BFS-IOACTIVE party during the Ekoparty conference. This blogpost aims at describing a successful resolution of the challenge.

2019 summer challenge writeup

The 2019 summer challenge is now closed! This was a bit of a departure from the usual hardened binaries, as it showcased a programming model that is not a distant relative of the Turing machine. This article will give a high level overview of the challenge's solution, and some behind-the scenes comments.

2019 summer challenge: Alonzo!

The Synacktiv summer challenge is back!

Grehack 2018 qualification challenge

Detailed write-up of Grehack 2018 qualification challenge.

2018 Summer Challenge Writeup

An old school RE challenge was published on August 07th and has been solved by several people. This blog post provides a detailed solution on how to solve this challenge followed by the winner write-up.