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Ransomware, data breach, compromised account. DEFION delivers immediate professional support for containing, investigating and recovering from cyber incidents. 24/7, remote and on-site.
What is Incident Response Service?
Incident Response Service is immediate professional help when you suspect or experience a cyber incident. The DEFION DFIR team performs triage, stops the threat (containment), investigates how the attacker got in and what was affected, and supports recovery. The team is available 24/7 via +31 (0)88 733 13 37 and operates both remotely and on-site across Europe.
Contain, investigate and recover
You suspect or know there is an incident. The team starts with triage: what is the scope, what is the impact, what is the current status? Based on this, the containment plan is determined. The threat must be stopped without unnecessarily destroying evidence or making the situation worse.
In parallel with containment, the forensic investigation runs. How did the attacker get in? What was compromised? What data was affected? These are the questions that need to be answered for effective recovery and for any reporting obligations to data protection authorities or regulators.
The team communicates clearly and regularly. During a crisis, information flow is critical. You receive regular updates on progress, structured for both technical teams and board and management.
The cost of wrong first steps
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Forensic evidence destroyed by wrong actions
Rebooting systems, running antivirus scans or deleting files can destroy critical evidence needed for forensic investigation, legal proceedings and insurance claims.
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Attacker remains active while you work on recovery
Without complete eradication, you re-expose systems by restarting them. Attackers who have established persistence return. Effective containment requires a controlled, coordinated approach.
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Reporting obligations not met
Data breaches must be reported within 72 hours to data protection authorities. NIS2 has its own reporting timelines. Without rapid forensic insight into what was affected, you cannot comply with these obligations.
What we cover
How DEFION handles an incident
Triage and mobilisation
Initial assessment of the incident, determination of severity and mobilisation of the right team. Phone guidance for first steps to protect evidence.
Containment
Isolating compromised systems, stopping active threats, protecting evidence. Controlled and coordinated to prevent reinfection.
Forensic investigation
Reconstruction of the attack: access vector, lateral movement, compromised data. Complete timeline of the attack with chain-of-custody documentation.
Eradication
Removal of the threat from the environment, validation that the attacker has no backdoors remaining. No recovery before the environment is clean.
Recovery
Support for safely restoring systems and services. Validation that restored systems are clean and functioning normally.
Post-incident
Root cause analysis, lessons learned and concrete recommendations to prevent recurrence. Debriefing with technical team and management.
Why Incident Response is essential
Modern cyberattacks move fast. Ransomware can encrypt entire environments within minutes. Without a tested response capability, downtime increases, costs spiral, and trust erodes. Incident Response ensures that threats are contained before they spread, evidence is preserved for investigations, and operations are restored quickly and safely.
Rapid Containment
Cyberattacks such as ransomware can spread within minutes. Swift isolation prevents escalation and limits disruption to business-critical operations.
Forensic Evidence
Incidents leave behind traces that are vital for compliance and legal defence. Proper evidence collection ensures accurate investigations and supports regulatory reporting.
Clear Coordination
During a crisis, uncertainty slows response. Defined playbooks and expert guidance provide clarity, reduce confusion, and keep teams aligned.
Structured Recovery
Downtime directly impacts revenue and reputation. Incident Response ensures fast, safe restoration of systems and processes to minimize financial loss.
Future Resilience
Every incident is also a learning opportunity. Post-incident advisory strengthens processes, improves monitoring, and reduces the likelihood of repeat attacks.
Deliverables
- Incident report with timeline, root cause, impact and recommendations
- Forensic report with technical details and evidence
- Executive summary suitable for management and regulators
- Reporting obligation documentation (GDPR, NIS2) where applicable
- Recommendations for improving detection, prevention and response
- Post-incident debriefing with technical team and management
- Chain-of-custody documentation for legal proceedings
For every organisation in crisis
Organisations with an active cyber incident
Ransomware, data breach, compromised accounts or suspicious network traffic. You need help now.
Companies suspecting a compromise
You see something unusual but do not know if it is an incident. The team assesses the situation and advises on the right steps.
Organisations with reporting obligations
Data breaches (GDPR) and significant incidents (NIS2) have strict reporting timelines. The team supports with the forensic investigation needed.
Companies needing legal evidence
In incidents with legal consequences, DEFION provides forensically sound evidence usable in proceedings.
Vendor-agnostic by design
DEFION works with the tooling you already have, or brings ours. No vendor lock-in.
FAQ
How quickly can you respond to an active incident?
What should we do before your team arrives?
Can you assist with ransomware negotiations?
How is evidence preserved for legal proceedings?
What if the incident originated at a supplier?
Incident or suspected compromise?
Call the 24/7 hotline directly or send a message. Every minute counts during an active incident.
Cyber incident? Read: What to Do in the First 24 Hours