Halcyon stops ransomware on the endpoint and captures encryption keys. Elastio detects corruption in your data regardless of how it got there. They cover different surfaces and work best together.
Halcyon and Elastio each answer a fundamentally different question about what happened during an attack.
“Can we stop ransomware before it encrypts our files?”
OutcomeRansomware stopped or reversed on the endpoint
“Has the attacker compromised my data?”
OutcomeVerified Data. Provable Recovery.
Better together: Halcyon covers the endpoint. Elastio covers the data. Together they give a CISO confirmed answers on both.
Halcyon's key capture works when ransomware runs on a protected endpoint. When the encryption happens somewhere else (a server without an agent, stolen cloud credentials, an unmanaged host) there is no key to capture and no rollback to run.
Attackers used compromised AWS credentials to encrypt S3 bucket data using AWS's own SSE-C encryption with an attacker-held key. No ransomware binary executed. No endpoint was involved. Data was encrypted and marked for deletion in seven days. There was no key for any endpoint agent to capture.
Source: Reported by Halcyon RISE Team, January 13 2025. Confirmed by AWS Security Blog, January 2025.
Elastio inspects the data directly, not the process that encrypted it. Whether encryption happened on the endpoint, in the cloud, via stolen credentials, or by an insider, Elastio detects the corruption inside the files. The source of the attack is irrelevant.
Side-by-side view of what each product covers, across endpoint protection, data-layer detection, and data surface coverage.
| Capability | Halcyon | Elastio |
|---|---|---|
| Endpoint | ||
| Ransomware prevention on endpoints | Yes | No |
| Encryption key capture during active attack | Yes | No |
| File decryption without paying ransom | Yes | No |
| Endpoint agent hardening and EDR protection | Yes | No |
| Data exfiltration monitoring | Yes | No |
| Data Detection | ||
| Zero-day ransomware detection | Partial | Yes |
| Early attack detection before encryption starts | No | Yes |
| Intermittent encryption detection | No | Yes |
| Insider-executed encryption detection | No | Yes |
| Encryption via stolen credentials detected | No | Yes |
| Custom hunts: YARA, SQL, regex | No | Yes |
| Data Coverage | ||
| Live data | No | Yes |
| Replicated data | No | Yes |
| Backup data | No | Yes |
| Cloud storage (S3, Blob, object stores) | No | Yes |
| Last Known Clean recovery point | No | Yes |
| Resilience RPO (R-RPO) | No | Yes |
| Provable recovery compliance reporting | No | Yes |
Were any files encrypted on our endpoints?
Did encrypted data reach our backups and cloud storage?
Which recovery point is clean and how long will recovery take?
Halcyon asks "Can we stop ransomware before it encrypts our files?" Elastio asks "Has the attacker compromised my data?" Halcyon covers the endpoint. Elastio covers the data.
Halcyon's key capture works when ransomware runs on a protected endpoint. When encryption happens somewhere else (a server without an agent, stolen cloud credentials, or an unmanaged host) there is no key to capture and no rollback to run.
In January 2025, attackers used compromised AWS credentials to encrypt S3 bucket data using AWS's own SSE-C encryption with an attacker-held key. No ransomware binary executed. No endpoint was involved. Data was encrypted and marked for deletion in seven days. There was no key for any endpoint agent to capture.
Elastio inspects the data directly, not the process that encrypted it. Whether encryption happened on the endpoint, in the cloud, via stolen credentials, or by an insider, Elastio detects the corruption inside the files. The source of the attack is irrelevant.
Insider-executed encryption detection is outside Halcyon's scope. Elastio detects insider-executed encryption without requiring mass file operation patterns.
Prevents ransomware from executing on endpoints using AI trained on ransomware behavior, captures encryption keys in memory during an active attack, decrypts files after encryption without paying the ransom, monitors for data exfiltration, and hardens endpoint agents against being disabled by attackers.
Yes. Halcyon covers the endpoint. Elastio covers the data. Together they give a CISO confirmed answers on both.
All product capabilities are current as of March 2026 and sourced by public documentation. Elastio is not affiliated with or endorsed by Halcyon.