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, 2026Venesco 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, Venesco 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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Venesco

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

Venesco is a U.S.-based government contractor providing administrative, healthcare, and professional services to military and civilian agencies. Its offerings include management consulting, logistics support, psychological services, biomedical and health services, research and development support, and specialized training programs. Clients include the Defense Health Agency and the Centers for Disease Control and Prevention, with administrative support at 17 CDC branches.

Industry: Government & Defense Consulting & Professional Services

Attack summary

Severity: critical — Venesco holds contracts with sensitive U.S. government agencies including the Defense Health Agency and CDC. Disclosed status is 'data_published', meaning regulated and potentially sensitive government, health, and military-related data has been exfiltrated and released, meeting the threshold for critical severity.

The ransomware group Sinobi claims to have attacked Venesco and has published data from the breach. The leak post describes the company's operations but does not specify the volume of exfiltrated data or whether systems were encrypted.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Administrative services records
Management consulting documents
Health services data
Psychological services records
Training program materials
Research and development program data
Government agency client records
CDC-related administrative data
DoD-related program data

What the group claims

Venesco specializes in providing premium administrative, healthcare, and professional services primarily for military and civilian clients. Their offerings include management consulting, logistics support, psychological services, and comprehensive training programs tailored to meet the unique needs of various agencies. With a strong focus on delivering quality and innovative solutions, Venesco supports a range of programs including research and development as well as health service initiatives. The company is dedicated to equipping clients with essential knowledge and skills to address critical challenges and achieve mission success.

Sources

Victim sitewww.venesco.com
Leak posthttp://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks/698b74ab6387a4c9a29b4e82

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.