Insomni’hack – Sec Team Blog

Insomni’hack 2023 CTF Teaser – DoH ! writeup

For this 2023 edition, i chose to focus on the DoH (DNS Over Https) protocol because it has gained popularity for attackers as a command and control (C2) communication channel for hiding DNS traffic through HTTPS rather than using the traditional DNS tunneling. In this post, i will describe in details how to solve the challenge.

Insomni’hack 2023 – hex-filtrate writeup

In this forensic challenge, a company has been compromised and their initial investigation led to a suspicious workstation. The CEO was very anxious about a potential exfiltration, and we were provided with a network dump of that workstation in the hope that we would be able to help him make some sweet dreams again.

Splunk Boss Of The SOC (BOTS) @Insomni’hack

It’s was a pleasure this year to meet you at the 2022 edition of our amazing security conference Insomni’hack !

With Splunk collaboration, we come back this year with “Splunk Boss Of The SOC” challenge.

Apiculture 2 write-up

The Apiculture challenges are dedicated to API attacks. The second level basically looks like a webpage dedicated to beehives:

Apiculture 1 write-up

The Apiculture challenges are dedicated to API attacks. It is basically a honey’s addict website:

GDBug write-up

The GDBug file is an ELF binary:

winhttpd writeup: private heaps pwning on Windows

Following last week-end’s Insomni’hack teaser and popular demand, here is a detailed write-up for my winhttpd challenge, that implemented a custom multi-threaded httpd and was running on the latest version of Windows 10:

Insomni’hack 2018 – vba03-strikeBack writeup

Here is a write-up for the challenge “vba03-strikeBack”, since none was posted yet on CTFtime.

All the source code for the malware and cookie logger are available on GitHub.

Insomni’Hack 2017 – FPS Write-Ups

For the 10th Insomni’Hack anniversary, new hacking challenge categories were available during the CTF. They consisted of social engineering, hacking room, and a multiplayer FPS game.

This article will cover several write-ups for this last category. It is a great occasion to understand quickly some basis of modern game hacking.

Exploiting a misused C++ shared pointer on Windows 10

In this post I describe a detailed solution to my “winworld” challenge from Insomni’hack CTF Teaser 2017. winworld was a x64 windows binary coded in C++11 and with most of Windows 10 built-in protections enabled, notably AppContainer (through the awesome AppJailLauncher), Control Flow Guard and the recent mitigation policies.