Five healthcare providers just reported ransomware-related data breaches to HHS. Alta Orthopaedics in California, Cornerstone Behavioral Healthcare in Maine, Cameron Regional Medical Center, and two others — all hit by ransomware that encrypted patient records and disrupted operations.
Same attack pattern. Same result. Same preventable problem.
Ransomware Requires Writing Files to Disk
Every ransomware attack follows the same technical sequence: the malware payload lands on a system, executes, and then writes encrypted versions of your files back to disk. Before any encryption happens, before any data gets exfiltrated, the attack requires file system write operations.
Most security tools try to recognize the ransomware signature — the specific variant, the known behavior patterns, the indicators of compromise. That’s a losing game. New variants appear daily. Signature updates lag behind. By the time your endpoint tool recognizes the threat, files are already encrypted.
FileSure operates at a different layer entirely. It sits at the Windows kernel level and controls file system operations directly: file open, read, write, delete, create, rename. It doesn’t care what the ransomware variant is called or what signature it carries. It enforces a simple policy: unauthorized programs don’t get to write executable files or modify PHI files.
The ransomware payload arrives via email, remote desktop, or a compromised web application. The delivery mechanism doesn’t matter. When the payload tries to write itself to disk — the first file system operation in the attack chain — FileSure blocks it. The executable never lands. The attack stops before it starts.
The Legacy Medical System Problem
Healthcare environments run on a mix of modern and legacy Windows systems. Medical imaging equipment, laboratory analyzers, infusion pumps, pharmacy management systems — much of this infrastructure runs on older Windows versions because the specialized software won’t run on anything newer. These aren’t neglected systems. They’re mission-critical devices that simply can’t be easily replaced.
Modern endpoint security tools won’t install on Windows XP or Windows 7. So these systems sit unprotected, connected to your network, holding patient data.
FileSure installs on all of them. It runs on legacy and modern Windows versions.
HIPAA Audit Trails You Can Actually Use
The HIPAA Security Rule requires covered entities to implement audit controls — technical mechanisms that record and examine activity on systems containing PHI. When OCR shows up for an audit, they want to see logs that prove you know who accessed patient data, when, and what they did with it.
FileSure logs every file operation on PHI: user name, machine name, program used, operation type (read, write, delete, create, rename), timestamp, and file path. The logs are encrypted, tamper-resistant, and stored separately from the files they record. A ransomware attack doesn’t take your audit trail with it.
A Specific Configuration That Works
Here’s a FileSure policy that would have prevented these attacks:
Rule: Block Unauthorized PHI Modification
- File filter:
*.dcm, *.hl7, *.xml, *.db, *.mdb(medical imaging, HL7 messages, EHR databases) - Authorized programs:
EHRApp.exe, PACSViewer.exe, LabSystem.exe(your specific applications) - Blocked operations: Write, Create, Delete, Rename
- Action: Block and log
- Scope: All drives, all users except SYSTEM
Any program not on the authorized list — including ransomware — cannot modify those files. The encryption never happens.
Five more healthcare providers just reported breaches. How many more before we stop chasing signatures and start controlling file operations?
Start a free 21-day trial of FileSure at bystorm.com. Install it in five minutes. See it block unauthorized file operations in real time.
Source: Five Healthcare Providers Report Ransomware-Related Data Breaches
Category: Ransomware
Tags: ransomware, healthcare data breach, hipaa compliance, phi protection, kernel filter driver, file system security, legacy medical systems, hipaa audit controls
