Halcyon
Ransomware resilience platform built to stop encryption before it starts.
About
Halcyon is a dedicated ransomware resilience platform rather than a general endpoint product. Its headline capability, File Resilience (FiRe), operates at the Windows kernel level and terminates ransomware encryption attempts before files are modified, aiming to remove the attacker's primary leverage instead of detecting or recovering after encryption. When an attempt is blocked, Halcyon's 24/7 Ransomware Operations Center investigates, contains, and evicts the threat actor.
The platform covers Windows, macOS, and Linux, with native macOS support and deeper Microsoft Defender and Microsoft Sentinel integrations added in 2026. It is designed to sit alongside existing EDR rather than replace it, catching ransomware its customers' current tools were never designed to stop. Everything about its effectiveness is provider-stated: the company publishes no independent test results I could verify, so treat the prevention claims as vendor-reported until third-party evaluations land.
What it can do
- Kernel-level ransomware encryption prevention
- File Resilience (FiRe) anti-encryption engine
- 24/7 Ransomware Operations Center
- Windows, macOS, and Linux coverage
- Microsoft Defender and Sentinel integrations
- Threat actor investigation and eviction
- Rapid recovery workflows
Setup
- Request a demo or trial at halcyon.ai.
- Deploy the Halcyon agent alongside your existing EDR on Windows, macOS, or Linux endpoints.
- Connect Defender/Sentinel integrations to feed your existing SOC workflows.
- Ransomware Operations Center engages automatically when an encryption attempt is blocked.
Prerequisites
Endpoints on Windows, macOS, or Linux; existing EDR in place (Halcyon layers on top rather than replacing it).
Use cases
Works with
Trust score — 7/10
Scored 7/10 (TIER metrics, metrics-v1). Evidence: active platform with File Resilience launch covered by industry press in Jul 2026; Windows/macOS/Linux coverage with Defender and Sentinel integrations; 24/7 Ransomware Operations Center is a real differentiator. Strengths: prevention-before-encryption is a genuinely different architectural bet, layers onto existing EDR, focused ransomware mission. Docked for: (1) prevention effectiveness claims are provider-stated with no independent test results I could verify; (2) young company competing against deeply entrenched endpoint incumbents. License: proprietary.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 7.0/10
- Maintenance · recency, releases, issue load
- 8.0/10
- Openness · license + docs
- 2.0/10
- Manual review · sanity read + red-flag check
- 1.0/10
- · Kernel-level File Resilience (FiRe) anti-encryption; 24/7 Ransomware Operations Center
- · Windows/macOS/Linux coverage with Defender and Sentinel integrations (2026)
- · Prevention claims are provider-stated; no independent test results found
- · Young company versus entrenched endpoint incumbents
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.