Disclosure context

About worldleaks

Based on the limited available data, worldleaks is a recently emerged ransomware group that was first observed in May 2025 and appears to be primarily financially motivated, having claimed 134 victims in a relatively short timeframe since its emergence. The group's origin and organizational structure remain unclear, with no publicly documented information from major cybersecurity firms or law enforcement agencies regarding their country of origin, potential affiliations, or operational model. Their targeting patterns indicate a focus on English-speaking countries, particularly the United States, United Kingdom, and Canada, with additional activity observed in Germany and Japan, while their sector targeting shows a preference for healthcare, technology, manufacturing, and consumer services organizations. Due to the group's recent emergence and limited public documentation by established threat intelligence sources, specific details about their attack methodologies, encryption techniques, extortion tactics, and notable campaigns have not yet been comprehensively analyzed or reported by organizations such as CISA, FBI, or major cybersecurity research firms. The group appears to remain active as of the most recent observations, though comprehensive threat intelligence profiling awaits further analysis and documentation by established cybersecurity authorities. The group has been linked to 155 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

May 12, 2026Bestat Pharmaservices Corp. listed by worldleakson the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Bestat Pharmaservices Corp. is reported in TW, a country with 46 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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Bestat Pharmaservices Corp.

Claimed by worldleaks · listed 8 days ago

Age

since listed · data leaked

Status timeline

Listed
May 12, 2026
Data leaked

At a glance

Group: worldleaks
Status: Data leaked
Country: TW
Sector: Healthcare
Listed on leak site: May 12, 2026

About the victim

AI dossier — public-source company profile

Bestat Pharmaservices Corp. is a Taiwan-based contract research organization (CRO) offering a full suite of clinical trial support services including project management, regulatory consultation, site monitoring, data management, biostatistics, clinical event committee services, medical writing, and quality assurance. The company serves pharmaceutical and medical device clients navigating clinical development and post-marketing studies. It operates under international GxP standards and handles both electronic and paper-based clinical data collection systems.

Industry: Clinical Research & Pharmaceutical Services (CRO)

Attack summary

Severity: critical — Bestat operates as a CRO handling sensitive clinical trial data including patient-level health information, eCRFs, and regulated pharmaceutical records. A confirmed data publication event in this sector carries a high likelihood of exposure of regulated medical and PII data at scale, warranting a critical classification.

The worldleaks ransomware group has listed Bestat Pharmaservices Corp. with a status of 'data_published', indicating that data has been exfiltrated and disclosed; no specific ransom demand or data volume was stated, and the group's leak post contained no additional detail.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Clinical trial data
Electronic case report forms (eCRFs)
Statistical analysis files
Regulatory submission documents
Quality assurance audit records
Medical writing documents
Patient recruitment records
Study protocols

Original description

AI-summarised, not from the leak post

N/A

Sources

Victim sitewww.bestat.com.tw
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/1785844076

Source

Indexed 8 days 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.