Independent since 2005

Defending your future.
Today.

Security built for a world where attackers use AI. DEFION combines offensive security expertise with AI that continuously detects, validates, and challenges your defenses. You see what’s happening in minutes and act before attackers get in.

Attackers already use AI to increase the speed and scale of cyberattacks. DEFION combines offensive security expertise with AI-driven analysis to help organisations respond with the same level of visibility, validation and speed. Active Defense means threats are hunted proactively, controls are continuously tested and response starts before incidents escalate.

Speak with our experts 24/7 Incident Hotline

Real analysts online in Zoetermeer and Barcelona. Average response under 5 minutes.

20+

Years of experience

100+

Security experts

1,000+

Organizations protected

100,000+

Endpoints monitored

Meet the team

100+ specialists.
Two offices.
One team.

Zoetermeer and Barcelona. Real people, senior expertise. No offshore support, no call-center triage. When you call DEFION, you reach the engineer who can actually help.

Independent since 2005. Still driven by the people who founded it.

Meet the team → Open roles →

The DEFION team together in the mountains during our annual offsite

DEFION engineers collaborating over shared desks

Four DEFION colleagues hanging out in a mountain cabin

Three DEFION colleagues relaxing on a couch after hours

What you get

Five disciplines.
One partner.

No juggling five vendors for five problems. One team that covers your entire security posture, from advisory to 24/7 monitoring and crisis response.

Strategic Resilience

Cybersecurity Advisory

You know exactly where your risks are and what to do about them. NIS2, DORA, ISO 27001: not paper compliance, but a clear plan that works.

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Attack Readiness

Pentesting Services

First vulnerabilities in your application within 24 hours. No more waiting weeks for a report. Breach rate: 93%.

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Adaptive Threat Detection

Managed Detection & Response

Your security team stops drowning in thousands of alerts. They only see what truly needs attention. 24/7.

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Cyber Crisis Management

Digital Forensics & IR

When an incident hits, our specialists are ready within minutes. Not after days of analysis. 24/7, across Europe.

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Business Continuity & Recovery

BCDR Services

You know exactly how long your business goes down during an attack. And what you can do to shorten that.

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Why DEFION

Independent.
AI-accelerated.
20 years proven.

You get advice without a hidden sales agenda. DEFION doesn't sell products, only protection. That means our recommendations are always in your interest.

From boardroom to server room, 24/7 monitoring and AI-accelerated pentesting. One partner for your entire attack surface: IT, OT, and IoT.

About DEFION →

What this means for you

Faster detection.
Less noise.
Better decisions.

You only get alerts that matter. No flood of false positives, no overwhelmed security team. Our technology filters the noise, our experts make the calls.

The result: threats detected in minutes instead of days. And when it counts, there are always people ready who know what to do.

Alert within 4 minutes

No hours or days waiting for an alarm

Only what matters

Your team sees relevant alerts, not thousands

Pentest in 24 hours

First vulnerabilities same day, not after weeks

Experts who decide

No automated guesswork, real human judgment

THREAT INTELLIGENCE

What we see right now. Week 23 — 3 June 2026

Week 23, 2026 · Updated June 3, 2026

Our TI team monitors 40+ sources 24/7. These are the most relevant threats for European organizations — updated June 3, 2026.

Ransomware · CRITICAL · All sectors (EU/Global)

TheGentlemen ransomware deploys BYOVD to kill EDR tools before encryption - 500% surge in NL victims

TheGentlemen ransomware disables EDR via BYOVD before encrypting, with a 500% surge in EU victims. Exploits FortiGate CVE-2024-55591 for initial access. Action: validate EDR and patch FortiGate immediately.

June 3, 2026 · Confidence: High

Supply Chain · HIGH · Technology, SaaS, Development (EU/Global)

Supply chain attack: 3,800 GitHub repositories compromised, 84 npm packages backdoored

3,800 GitHub repos compromised and 84 npm packages backdoored. CISA confirms ransomware linkage. Attackers use dev environments as the entry point to production. Action: audit npm dependencies and implement SBOM.

June 3, 2026 · Confidence: High

Ransomware · HIGH · Finance, Healthcare, Technology (EU/Global)

Data extortion without encryption: 38% of ransomware attacks now skip encryption entirely

38% of 2026 ransomware attacks exfiltrate data without encrypting, bypassing backup recovery strategies. Qilin and DragonForce lead this shift in EU targets. Action: implement DLP and update IR plans for data extortion.

June 3, 2026 · Confidence: High

View all threat intelligence →

Sector Expertise

We speak your language.

Critical Infrastructure

Trusted by leading organizations

What our customers say

All customer stories →

“Thanks to DEFION, we have genuine insight into emerging security threats and how to defend against them. That gives us confidence we're properly prepared.”

Jeroen van Stokkum
Manager ICT · AFAS

“Working with DEFION means working with a professional partner who supports us at exactly the right level. The collaboration fits perfectly within our strategy to deliver secure drone technology to European customers.”

Security Team
Drone Technology · Avy

“DEFION Security gives us confidence that our healthcare platforms meet our customers' strict security expectations. Their specialists think alongside us and help us continuously strengthen our digital resilience.”

Management
Healthcare Platform · CLB

“The collaboration serves as a constant reminder to keep the focus on security. It keeps us alert and sharp. DEFION's specialists are highly technical and passionate about their field.”

IT Team
E-commerce · FuturumShop

“The DEFION team knows our environment well and understands how our organisation works. You barely notice you're dealing with an external party - they fit seamlessly into our department.”

IT Department
Government · Municipality of Arnhem

“DEFION Security has been supporting our insured clients for some time, providing expert cybersecurity advice. Now DEFION is also responsible for continuous monitoring and coordinated incident response for Hienfeld itself.”

Management
Financial · Hienfeld

“The DEFION team specialises in financial services and understands how our organisation works. You barely notice you're dealing with an external party - they fit seamlessly into our department.”

Security Officer
Online bank · Knab

“With DEFION we know we have the right expertise to keep our systems secure. The specialists truly sat alongside us rather than across from us. That gives us the confidence to face the future.”

Technical Team
Water Management / OT · NAD

“DEFION's specialists are an extension of our own team, ensuring we stay alert to threats at all times. It's reassuring to have an independent partner with extensive experience who gives proactive advice.”

Security Management
Entertainment · Dutch State Lottery

“Security is in DEFION's DNA. For them, security is never a compromise. I dare say: if we didn't act on their recommendations, they simply wouldn't accept that.”

Management
Payment Platform · OPP

“DEFION's SOC gives us peace of mind that we're continuously in control. You notice that highly qualified people work there who not only detect problems but also think along with us on improvements.”

Management
Consultancy · &samhoud

“SURF looks forward to working with DEFION. The Managed Detection & Response service offers a unified approach to further strengthening the cyber resilience of the entire education and research sector.”

SURF
Education & Research · SURF

Newsroom

All news →

Partnership 29 Apr 2026

Ready to make your
security AI-proof?

Talk to one of our experts. No obligations, no sales pitch: an honest conversation about your situation.

Get in touch 24/7 Incident Response

Defending your future.
Today.

100+ specialists.
Two offices.
One team.