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

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Halcyon Technologies is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

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Halcyon Technologies

Claimed by sinobi · listed 3 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 12, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: United States
Sector: Not Found
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 3 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.