Who we are

We're a small team of Ethical Hackers and technical consultants, led by Mark Koek. Mark has 20 years of experience as an ethical hacker and technical consultant on IT security risks, at the Dutch National Cyber Security Centre, Deloitte and Fox IT.

Mark is specialised in computer security incident response and penetration testing (ethical hacking). In 2013, Mark started his own company: QCSec. In 2017 we changed the name to HackDefense.

The company was a success from the start. Since it was founded we've served 43 clients in several countries, conducting 64 penetration tests and consulting projects. These clients range from the largest bank in the Netherlands to a single person law office. Wherever information security is truly essential, HackDefense's excellent technical expertise is enlisted.

HackDefense is a co-founder of the Phishingtest.com service and contributes its technical expertise to tests of clients' vulnerability to (spear)phishing and ransomware.

IT Security | Testing | Advice