Was Halcyon Technologies hit by ransomware?

Halcyon Technologies was listed by the sinobi ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the sinobi ransomware group?

sinobi is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Halcyon Technologies breach?

sinobi published data attributed to Halcyon Technologies. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Halcyon Technologies

Claimed by Sinobi · listed 5 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 12, 2026
Data leakeddate unknown

At a glance

Group: Sinobi
Status: Data leaked
Country: United States
Listed on leak site: Feb 12, 2026

About the victim

AI dossier — public-source company profile

Halcyon Technologies is a US-based cybersecurity company that develops an adaptive security platform specifically designed to prevent ransomware attacks. The platform combines multiple proprietary prevention engines with AI models focused on stopping ransomware, and is built by offensive security professionals. The company markets itself as providing the industry's first dedicated ransomware-resilience solution.

Industry: Cybersecurity Software & Services
Employees: 51-200
Founded: 2021

Attack summary

Severity: high — The disclosure status is 'data_published,' confirming exfiltration and public release of data. The victim is a cybersecurity company whose proprietary anti-ransomware technology, internal research, and customer data could be highly sensitive and damaging if exposed, elevating severity beyond medium even without detailed data inventory.

The ransomware group 'sinobi' claims to have attacked Halcyon Technologies and has reached the data_published disclosure stage, indicating data has been exfiltrated and published. The specific data types and volume are not detailed in the truncated leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Internal company data
Proprietary source code or platform details
Business records

What the group claims

Halcyon is the industrys first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware. Halcyon is built by offensive security experts to stop attackers.

Sources

Source

Indexed 5 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About sinobi

Based on the limited publicly available information, Sinobi appears to be a recently emerged ransomware operation first observed in July 2025, with financial motivations evidenced by their targeting of 268 victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, and there is no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major security research organizations, though their targeting patterns suggest a broad opportunistic approach rather than highly selective operations. The group demonstrates a preference for targeting organizations in the United States, India, United Kingdom, Canada, and Italy, with a focus on manufacturing, healthcare, construction, and technology sectors, suggesting they may exploit common vulnerabilities across these industries rather than deploying sophisticated, sector-specific attack vectors. No major high-profile campaigns or significant law enforcement actions against Sinobi have been publicly reported by CISA, FBI, or established threat intelligence firms. Given the recent emergence timeline and lack of extensive public documentation, the group's current operational status and long-term trajectory remain unclear, though the substantial victim count suggests continued activity as of the last available reporting period. The group has been linked to 274 public disclosures across our corpus. First observed on a leak site on July 5, 2025; most recent post May 8, 2026. The operation is currently active.

Timeline of this disclosure

February 12, 2026Halcyon Technologies listed by sinobion the group's public leak site

Other recent disclosures by sinobi

sinobi has been linked to 274 public victims on Darkfield. A sample of the most recent:

See the full sinobi dossier →

Sector and geography

Geographically, Halcyon Technologies is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by sinobi means Halcyon Technologies appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on sinobi's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.