Halcyon

What Halcyon actually does

Halcyon is a single-purpose platform: stop ransomware. It sits alongside your existing EDR and adds a dedicated layer of anti-ransomware protection. The agent monitors for encryption behaviors and intervenes to prevent file encryption, even against novel ransomware variants that bypass signature-based detection.

If encryption does begin, Halcyon captures encryption keys and enables recovery without paying the ransom. This key capture capability is the technical differentiator — it turns a catastrophic ransomware event into a recoverable incident.

The platform uses multiple detection techniques: pre-execution analysis, behavioral monitoring during execution, and a decoy-based approach that detects encryption activity early. It’s designed to catch what your primary EDR misses, not to replace it.

Who it’s best for

• Organizations in industries heavily targeted by ransomware (healthcare, manufacturing, legal, education)
• Companies that already have EDR but want a dedicated anti-ransomware safety net
• Security teams that need to demonstrate specific ransomware resilience to the board or insurers
• Organizations with critical data where encryption would cause operational shutdown
• Companies where cyber insurance requirements demand additional ransomware controls

Pricing reality check

Halcyon prices per endpoint on an annual subscription basis. The cost is additive to whatever you’re already spending on EDR — this is not a replacement, it’s a supplement. For organizations where ransomware is an existential risk, the additional cost is easy to justify. For others, it may be harder to budget for a single-purpose tool.

Evaluate the pricing against the cost of ransomware recovery. If a ransomware incident would cost your organization millions in downtime, recovery, and reputational damage, the per-endpoint premium for a dedicated anti-ransomware layer is modest by comparison.

Alternatives to consider

• CrowdStrike/SentinelOne/Microsoft Defender — Your existing EDR already has anti-ransomware capabilities. Evaluate whether they’re sufficient before adding another agent.
• Rubrik/Cohesity — Immutable backup and rapid recovery. Different approach — accept encryption may happen and focus on recovery speed.
• Zscaler — Zero trust access reduces the attack surface that ransomware operators exploit. Preventive rather than reactive.

The Charting Cyber take

Halcyon occupies a narrow but important niche. Ransomware remains the most common cause of catastrophic security incidents, and existing EDR tools, while good, don’t catch everything. Having a dedicated last line of defense that can capture encryption keys is a genuinely compelling capability.

The honest question to ask is whether you need it. If your EDR is well-tuned, your backups are immutable and tested, and your network segmentation limits blast radius, the marginal value of Halcyon decreases. If any of those conditions aren’t true — and for most organizations, at least one isn’t — Halcyon fills a real gap. It’s particularly compelling for organizations where a ransomware event would be existential, not just expensive.