Was Burning Rock Biotech hit by ransomware?

Burning Rock Biotech was listed by the thegentlemen ransomware operation (China), 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 thegentlemen ransomware group?

thegentlemen 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 Burning Rock Biotech breach?

thegentlemen published data attributed to Burning Rock Biotech. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Burning Rock Biotech

Claimed by Thegentlemen · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedApr 8, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: China
Sector: Healthcare
Listed on leak site: Apr 8, 2026

About the victim

AI dossier — public-source company profile

Burning Rock Biotech Limited (NASDAQ: BNR) is a China-based global diagnostics company specializing in next-generation sequencing (NGS) technology applied to precision oncology. The company offers NGS-based therapy selection testing for late-stage cancer patients, minimal residual disease testing, hematologic malignancies testing, and early cancer detection services for both tissue and liquid biopsy samples. It holds CE-marked oncopanels, CLIA/CAP-accredited laboratory operations, and serves biopharma partners internationally.

Industry: Precision Oncology Diagnostics (NGS-based)
Employees: 201-500
Founded: 2014

Attack summary

Severity: high — Burning Rock handles sensitive oncology diagnostic data including genomic sequencing results and patient clinical information, which constitutes regulated medical/health data. Data has been published (not merely listed), and the company's operations span clinical trials and biopharma partnerships, making any exfiltration of operational or patient-linked data a high-severity event. Insufficient evidence to elevate to critical without confirmed PII/patient data volume.

The group 'thegentlemen' claims to have compromised Burning Rock Biotech and has published data (disclosed_status: data_published), though no ransom amount or explicit data volume was stated in the post. The leak post references the company's public profile and NASDAQ listing but does not elaborate on specific data categories exfiltrated or encryption of systems.

high

Data the group says was taken

AI dossier — extracted from the leak post

Company business data
Potentially clinical/genomic test data
Potentially patient records
Potentially biopharma partner data
Corporate financial records

What the group claims

brbiotech.com zoominfo.com/c/burning-rock-biotech/426006520 Burning Rock Biotech Limited (NASDAQ: BNR), whose mission is to Guard Life via Science, focuses on the application of next generation sequencing (NGS) technology in the field of precision oncology. Its business consists of i) NGS-based therapy selection testing for late-stage cancer patients, with the leading market share in China and ii) NGS-based cancer early detection, which has moved beyond proof-of-concept R&D into the clinical validation stage

Sources

Victim sitebrbiotech.com

Source

Indexed 2 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 thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 483 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 11, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

April 8, 2026Burning Rock Biotech listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 483 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,780 disclosures indexed across all operators we track. Geographically, Burning Rock Biotech is reported in China, a country with 30 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Burning Rock Biotech 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.
Monitor for the data appearing on thegentlemen'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.