NHS Trust Reduces Lateral Movement Between Clinical and Administrative Networks
94%
Lateral movement surface reduced
The Problem
NHS Trusts operate flat or poorly segmented networks where administrative systems share infrastructure with clinical databases containing patient records. Ransomware entering through email or web browsing can traverse directly to systems holding sensitive health data.
The Scenario
A phishing attack compromised an administrative workstation in the finance department. The attackers used standard lateral movement techniques to discover and access clinical database servers on the same network segment. Patient records for 340,000 individuals were at risk of exfiltration.
The Protection
- Physical disconnection between administrative and clinical network segments
- Patient database backups stored in offline vault, unreachable from any network
- Clinical system configurations isolated from administrative infrastructure
- DORA Article 11 resilience testing validated quarterly
The Outcome
94% Lateral movement surface reduced
The Trust contained the incident to the administrative segment within 20 minutes. Clinical systems continued operating without interruption. Patient data was never at risk because the physical path between segments did not exist when not explicitly required.
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