Recover from ransomware in hours, not days or weeks

Emergency Ransomware Recovery

Are you currently being impacted by a ransomware attack? We can help.

The Halcyon Greenlight Service specializes in helping organizations recover from ransomware. Our team of incident response experts will jump into action to immediately contain the threat, accelerate recovery efforts, and prevent attackers from returning.

Experiencing an Attack?

What We Do

Shut Down The Attack

Within hours Halcyon determines the initial attack vector and control failures, and secures impacted environments to prevent secondary attacks as part of our post ransomware Greenlight Service.

Rapidly Recover Encrypted Files

Halcyon uses our proprietary technology and processes to rapidly recover files encrypted by ransomware, even when the keys and decryptors were previously unavailable.

Safeguard the Environment

As part of the incident response, we deploy the Halcyon agent to gain insight into the TTPs of ransomware operators and to provide immediate protection.

Halcyon stops the attack, recovers your files, and prevents attackers from coming back.

"Halcyon recovered our 911 systems and all critical city services within days. We would have had to pay over a million dollars to a threat actor with no guarantees that our data would be recoverable. We are forever in Halcyon's debt."

CISO, major metropolitan city, February 2025

"What separates Halcyon is in the response and recovery, where it will intercept the decryption keys if you're a victim of a ransomware attack…and restore your data."

Michael Pilch, MSIT, CISSP, Information Security Officer, Information Technology Services

UnmaskING the Threats

Inside the Threat Actor Index

Uncover key ransomware groups, their tactics, and targets. Explore the Threat Actor Index to strengthen your defenses and stay prepared for today’s most dangerous adversaries.

Explore Threat Actors

HALCYON RAPID RECOVERY

Recover Encrypted Files

Halcyon has the unique ability to decrypt data without relying on backups or negotiating with attackers, dramatically reducing cost by not having to pay the attackers, and saving weeks of downtime.

First, we analyze the attackers' toolkit to identify vulnerabilities and better understand what they are using. In some cases, Halcyon will already have access to a decryptor, and our agent will begin automatic decryption. When an existing decryptor is unavailable, we extract the private key and optimize decryption speed, resulting in a 3-10X faster recovery. In tandem, our team will begin reverse engineering the threat actor's encryption binary. Once the keys and decryptor are available, our team uses the Halcyon agent for easy recovery.

Experiencing an Attack

Halcyon Greenlight Containment and Eradication Service

Standard incident response teams are good at general cyber recovery but often lack the expertise needed to respond to ransomware attacks. Our ransomware IR specialists lead recovery efforts, evict attackers, and ensure your environment remains secure.

Rapid Deployment When It Matters Most

When ransomware strikes, Halcyon Greenlight deploys immediately with elite incident response teams and anti-ransomware and industry leading endpoint detection and response technology at zero cost during the active incident. Our specialists provide dual visibility into your internal environment and the external attack surface from day one.

Complete Environment Lockdown

We go beyond containment to prevent second ransomware attempts. Greenlight implements immediate backup isolation, hardens MFA across your enterprise, secures public-facing infrastructure, and audits identity access to eliminate persistent threats that standard IR teams often miss.

From Crisis to Recovery in Hours

With an average containment time of less than 24 hours, you'll receive a fully locked-down environment, verified and isolated backups, executive-level incident briefings, and a prioritized roadmap for immediate and mid-term security improvements.

Expertise Matters

Halcyon’s deep focus on ransomware enables our team to identify and stop threats that might get past other security teams. This is why other organizations, including government agencies and cybersecurity vendors, often turn to us when they need assistance with ransomware.

Learn More

Don’t Let Ransomware Keep You Down.

Talk to a Halcyon Services expert to learn more.