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 10, 2026Halcyontek 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, Halcyontek 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

listed as Halcyontek · Claimed by sinobi · listed 3 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 10, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: United States
Sector: Not Found
Listed on leak site: Feb 10, 2026

About the victim

AI dossier — public-source company profile

Halcyon Technologies is a US-based AI-first technology services company specializing in AI consulting, data science, generative AI solutions, and enterprise automation. The company deploys AI agents and automation systems for sectors including Automotive, Healthcare, Retail, and QSR enterprises. It offers end-to-end services from strategy and implementation to managed AI-as-a-Service.

Industry: AI Development & Consulting Services

Attack summary

Severity: medium — Data has been marked as published, indicating confirmed exfiltration, but no specific data categories, file counts, or regulated/sensitive data types have been identified in the post or excerpt. The scale and nature of exposed data remain unclear, warranting a medium rating.

The ransomware group 'sinobi' claims an attack on Halcyon Technologies and has published data (disclosed status: data_published). The leak post text appears to describe Halcyon's anti-ransomware competitor (Halcyon.ai) rather than the victim, suggesting possible confusion or deliberate misdirection, but the target domain and company name indicate Halcyon Technologies (halcyontek.com) is the claimed victim.

medium

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

Victim sitewww.halcyontek.com
Leak posthttp://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks/698b777c6387a4c9a29b666b

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.