My name is Lennaert and I'm a student digital forensics I enjoy programming, mostly in PHP and Python, among my interests:
- Ethical hacking / pentesting / redteaming
- Malware analysis
- Opensource Intelligence (OSINT)
- The occasional CTF challenge
Volunteer & Community work
Since 2018 I've volunteered for Hack In The Box Amsterdam, a cool security conference taking place in my home town.
I also volunteer as a security researcher for the DIVD, the Dutch Institute for Vulnerability Disclosure.
With a lot of things moving online in 2020 I have helped out at multiple online conferences, such as Circle City Con and BeerCon2. I'm also part of the crew hosting Infosec Happy Hour every Friday at 20:00 GMT.
Responsible Disclosure
I do a lot responsible/coordinated vulnerability disclosure, a few examples where I've gotten recognition:
Indicted in various Hall of Fame's:
The NPO (Dutch public broadcaster)
The Information Security Service for Dutch municipalities
Carlsberg
This cool challenge coin, and handwritten note, from the Aviation ISAC:
Reported multiple vulnerabilities to the Dutch Government, and received their famous "I hacked the Dutch Government, and all I got was this lousy t-shirt" for it.
Won the 'Most Techy Hack' award during a hackathon where the Toon, a smart thermostat from Dutch energy company Eneco was hacked.
Public Speaking / Presentations & Media
On September 1st I was a guest in "BNR'S Big Five" when they had a week about cyber security, I spoke about being an ethical hacker and my work with the DIVD.
BNR’s Big Five
You can also listen to this on Spotify:
In July 2021 I was a guest in the NOS op 3 Tech Podcast, to talk about the big ransomware attack on Kaseya and the work we did with the DIVD in the responsible disclosure of one of the 0-days the attackers used.
You can also listen to this on Spotify:
My first public speaking experience was at BeerCon2, which I wrote at length about on this blog. The talk I gave is available on YouTube:
I also spoke at BeerCon3:
https://www.youtube.com/watch?v=fg-35SQUnNI
MayContainHackers, a camp held in the Netherlands in 2022:
https://media.ccc.de/v/mch2022-55-scanning-and-reporting-vulnerabilities-for-the-whole-ipv4-space-how-the-dutch-institute-for-vulnerability-disclosure-scales-up-coordinated-vulnerability-disclosure
The ONE Conference, a security conference organized by the Dutch NCSC:
https://one-conference.nl/video/wf-19-kaseyavsa-and-what-divd-did-to-prevent-the-abuse-of-seven-zero-days.mp4
Hacker Hotel:
https://www.youtube.com/watch?v=a5NpYFqapUI