Fortifying Healthcare Networks Through DNS Visibility
A major healthcare provider operates a large network spanning hospitals, clinics, and specialised care facilities. Within this expansive environment, countless IoT (Internet of Things) and OT (Operational Technology) devices—infusion pumps, imaging systems, HVAC controls, and more—are all indispensable to patient care and facility management. Yet these same devices often run on legacy systems that are challenging to patch or upgrade, leaving the organisation vulnerable to cyber threats.
The provider’s existing security solutions—endpoint protection, firewalls, and network monitoring—work to block known malicious activity. However, pinpointing which device initiates a suspicious connection remains a painful task. The complexity intensifies when IoT or OT endpoints operate on older OS versions or proprietary protocols. Any disruption or downtime risks patient safety and operational continuity.
DNSSight addresses these challenges by offering deep DNS visibility—identifying malicious requests and the devices behind them—without requiring disruptive infrastructure changes or agent installations.
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Challanges
Disparate IoT & OT Devices
Legacy Systems: Many medical devices run on outdated or specialised operating systems that can’t accommodate additional security agents.
Diverse Protocols: From lab equipment to climate control systems, each device communicates differently, making uniform oversight difficult.
Visibility Gaps
Limited Log Correlation: Traditional security tools rarely map DNS queries to the specific device or user, leaving gaps in incident investigations.
Critical Environment: Healthcare organisations must ensure minimal downtime; major network reconfigurations could disrupt life-saving services.
Compliance & Data Protection
Patient Privacy: Storing and transmitting sensitive health data, the organisation must align with regulations like HIPAA and GDPR (for global facilities) while safeguarding against cyberattacks.
Audit Requirements: With multiple regulatory bodies auditing healthcare practices, robust logging and quick evidence retrieval are paramount.
Solution
DNSSight for Healthcare IoT/OT Security
Agentless DNS Visibility
Non-Invasive Monitoring: DNSSight monitors DNS traffic from every device without installing software on sensitive or legacy systems.
Real-Time Correlation: It automatically enriches DNS logs with user, device, and location data, revealing exactly which piece of equipment or system generated each request.
Early Threat Detection
Malicious Domain Alerts: Even if an IoT ventilator or lab machine attempts to connect to a known bad domain, DNSSight instantly flags and records it.
NX Domain & Short-Lived Domains: Many ransomware campaigns use fleeting or offline domains. DNSSight captures these queries, alerting security teams before an active compromise escalates.
Reduced Operational Impact
Minimal Downtime: Deploying DNSSight does not require revamping network architecture or swapping out DNS servers—vital in a 24/7 healthcare setting.
No Agent Overload: Freeing staff from installing and managing software across hundreds or thousands of specialised devices reduces complexity and risk.
Comprehensive Security Posture
Integrated SIEM Workflows: DNSSight forwards critical DNS events to the organisation’s SIEM system, enriching broader threat intelligence.
Flexible Dashboards & Reporting: Security teams can rapidly investigate anomalies or produce compliance reports spanning entire hospital networks, clinics, and labs.
Results
Faster Incident Response
Pinpointing Specific Devices: When a suspicious DNS query appears, DNSSight’s real-time correlation reveals the exact source device. The SOC can isolate or patch it before patients or services are impacted.
Improved Security ROI
No Major Overhaul: DNSSight leverages the existing DNS infrastructure, complementing firewalls, SIEMs, and other tools already in place.
Less Administrative Overhead: With automated data enrichment and centralised dashboards, staff focus on action rather than manual log investigations.
Enhanced Patient Safety & Compliance
Proactive Threat Management: Detecting threats earlier safeguards essential patient data, critical care equipment, and day-to-day operations.
Clear Audit Trails: Every DNS query is stored and easily retrievable, ensuring compliance with stringent healthcare regulations and privacy mandates.
Future-Ready Defence
Scalability Across Facilities: As the healthcare system expands—adding satellite clinics or acquiring new specialty centres—DNSSight can seamlessly integrate new endpoints.
Broad Support for Legacy Devices: Even as older equipment remains in service, DNSSight continues to provide full DNS visibility, reducing potential blind spots.
Conclusion
In an environment where patient safety is paramount and downtime can be life-threatening, DNSSight delivers the agentless, non-disruptive DNS visibility healthcare providers need. By shedding light on every DNS request, it allows security teams to swiftly detect compromised IoT and OT devices—without retooling networks or risking hospital operations.
For healthcare organisations aiming to protect critical data, maintain compliance, and secure a rapidly evolving fleet of medical and facility technology, DNSSight stands out as a transformative yet practical solution.
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