About Me
Welcome on my personnal website,
My name is Guillaume GRONNIER.
Actually, I’m working for Thales as security engineer and CTI analyst.
I also had my own little company in cyber security, active until January 2024 where I was offering some services arount threat hunting and perimeter risk assesment.
I’m specialise in Threat Intelligence with good knowledge in threat hunting and malware hunting.
I also like forensic analysis and cyber investigation based on OSINT.
In past, I worked for:
- Resilient as cybersecurity Consultant between October 2021 and December 2023
- VINCI SA as CERT Analyst between September 2020 and Avril 2021.
- CEIS as Cyber Threat Intelligence consultant between October 2017 and July 2020. I was in work-study between October 2017 and December 2018 as part of my Master’s Degree in cyber defense.
- Cyberprotect CERT as malware analyst between September 2016 and July 2017 as part of my Bachelor’s Degree in hacking/pentest work-study.
- Michelin CERT as CERT analyst between April 2016 and June 2016 as part of my Two-year university degree in computing science placement.
My LinkedIN profile: Guillaume GRONNIER
I’m able to develop in many languages, but mostly in Golang and python. You can found some of my project on my github : https://github.com/gugronnier
Since 2015, i participate at some french computing security or hacking events:
- Nuit du Hack 2015 (Public CTF participant)
- Hackathon Edition-ENI 2015 (CTF participant)
- Nuit du Hack 2016 (Public CTF participant)
- FIC 2017 (CTF challenge creator with ACISSI association)
- Nuit du Hack 2017 (Public CTF challenge creator)
- Nuit du Hack 2018 (Public CTF challenge creator)
- LeHack 2019 (CTF participant with 0x90r00t team)
- peaCTF 2019 (CTF participant with 0x90r00t team)
- CCCamp 2019 (Online – CTF participant with 0x90r00t team)
- HackCon India 2019 (Online – CTF participant with 0x90r00t team)
- Defcamp Quals 2019 (Online – CTF participant with 0x90r00t team)
- Defcamp Final 2019 (Bucarest – CTF participant with 0x90r00t team)
- … many other CTF always with 0x90r00t team
You can found my every year at the event LeHack at Paris. And also at the Defcamp at Bucarest for the D-CTF final.
CVE found and reported :
- CVE-2019-10956 and CVE-2019-10958 on GEUTBRUCK G-Cam and G-Code as reported in the ICS CERT advisory ICSA-19-155-03
If you need to contact me for anything, feel free to use those available below:
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