Anti-Malware for OT: EDR vs. AV
Regulatory Context: IACS UR E27 (Section 4.3.2) mandates protection against malicious code. This module explores the selection of security tools that provide robust protection without compromising the real-time availability of shipboard control systems.
In the machinery space, the “Cure” can be more dangerous than the “Disease.” Standard Antivirus software often consumes high CPU resources or mistakenly quarantines critical OEM drivers, causing a system freeze. To comply with E27, we must implement anti-malware solutions that are “OT-Aware.”
The Conflict: Stability vs. Security
The VSAT Update Trap
Traditional AV requires daily signature updates. On a ship with limited bandwidth, an AV that cannot “call home” becomes useless against new threats within 48 hours.
False Positives in OT
Proprietary OEM software often behaves like “malware” in the eyes of standard AV because it accesses low-level hardware ports. A false positive here can stop the Main Engine.
Technical Comparison: Choosing the Right Tool
While legacy systems still rely on antivirus controls, modern maritime cybersecurity strategies are increasingly adopting EDR to provide proactive threat detection and response.
| Feature | Legacy Antivirus (AV) | Modern EDR |
|---|---|---|
| Detection Method | Known File Signatures | Behavioral AI (Anomalies) |
| Offline Capability | Poor (Needs updates) | High (AI logic is local) |
| Resource Impact | High (Disk Scanning) | Low (Passive Monitoring) |
| OT Recommendation | Avoid for Core Assets | Recommended for E27 Compliance |
Next Security Phase
Software & Firmware Patch Management
Software & Firmware Patch Management Regulatory Context: IACS UR E27 (Section 4.4) requires a documented process for identifying, testing, and deploying security patches. This module defines the "Safety-First" approach to patching critical maritime a...