Jeroen Gui is a computer science and information management student at KU Leuven, founder of JustGuard, and a dedicated cybersecurity expert. With a passion for online threat hunting, he has been actively fighting cyber threats like phishing, malware, and fake stores since 2021.

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How I’m fighting cybercrime with Spamhaus (and how you can too!)

Meet Jeroen Gui - student, founder of JustGuard, and a top contributor to Spamhaus' Threat Intel Community Portal. Passionate about making the internet a safer place, Jeroen submits thousands of malicious domains, URLs, and raw email sources every month. But what drives him to share his data, and how can you get involved too?

Threat intelligence

Threat hunting

Blog • February 26, 2025

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