Telco Stops Ransomware Kill-Chain by Physically Isolating Core Network Management
0
Propagation paths to core network
The Problem
Telecoms operators manage core switching and routing infrastructure through network management systems that sit at Purdue Level 3. These systems are routinely accessible from the IT domain, creating a direct path from a compromised workstation to the infrastructure that carries national voice and data traffic.
The Scenario
Ransomware entered through a phishing email targeting an IT administrator. The attackers moved laterally through the corporate network, targeting network management consoles that control core switching fabric. Had they reached Level 3, the operator faced potential disruption to millions of subscribers.
The Protection
- Network management consoles physically disconnected at Layer 1 when not in active use
- Configuration backups for core routers and switches stored in offline vault
- Firmware images and signing keys isolated from any connected network
- DORA Article 11 resilience testing validated with zero propagation paths confirmed
The Outcome
0 Propagation paths to core network
The ransomware encrypted IT workstations but could not reach network management systems. Core switching infrastructure continued operating without interruption. The operator demonstrated DORA compliance to regulators within 48 hours of the incident.
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