® 
Malware
Definition
Malware is malicious software designed to damage computer systems, steal data or gain unauthorised access. The term encompasses viruses, trojans, spyware, ransomware and more.
Malware is an umbrella term for all harmful software programs. Types include viruses (self-replicating), worms (spreading via networks), trojans (hiding behind legitimate software), spyware (monitoring users), adware, rootkits and ransomware.
Malware enters via phishing, malicious downloads, infected USB drives, unpatched vulnerabilities or supply chain attacks. Once installed, malware can steal data, encrypt systems or open backdoors.
Defence consists of endpoint detection (EDR), network segmentation, patch management and 24/7 monitoring by a SOC. Polymorphic malware continuously changes its code to evade detection. National cybersecurity centres across the EU warn that state-sponsored malware represents a growing threat to critical infrastructure. Application whitelisting prevents unauthorised software from executing.
Impact on organisations
The impact on organisations is substantial. Under NIS2, organisations in critical sectors are required to implement appropriate technical and organisational measures. DORA sets comparable requirements for financial institutions. The average cost of a security incident amounts to millions of euros in recovery, legal fees and reputational damage. National cybersecurity centres warn that advanced threat actors increasingly target European organisations.
Protection
Effective protection requires a layered approach combining technical measures with organisational processes and awareness. Regular testing of security measures through pentests and security assessments is essential. An incident response plan with clear roles and communication lines prepares the organisation for worst-case scenarios. Continuous monitoring through an MDR service or internal SOC detects threats before they can cause damage. Security awareness training ensures employees recognise and report suspicious activities.
The threat landscape evolves rapidly. Organisations that operate only reactively face increasing risk. A proactive security strategy combines technical measures with regular security testing, continuous monitoring and a practised incident response team. NIS2 requires organisations in critical sectors to implement demonstrable security measures, including supply chain risk management and regular assessments. The cost of prevention is a fraction of the cost of a security incident: the IBM Cost of Data Breach Report 2024 documents average costs of $4.88 million per incident. Organisations with an MDR service or practised incident response team save an average of $2.66 million per incident compared to organisations without preparation.
How DEFION helps
DEFION offers a comprehensive portfolio of security services that help organisations address this threat. The 24/7 SOC team continuously monitors for suspicious activities. Pentests and red teaming exercises test the effectiveness of existing security measures. In the event of an incident, the DFIR team is immediately available for forensic investigation and recovery. This requires a proactive security strategy that is regularly tested and updated based on the current threat landscape. Organisations that invest in prevention and preparation save significantly on incident response costs. ISO 27001 provides a proven framework for structurally organising information security.