Was Greenbrook Engineering hit by ransomware?

Greenbrook Engineering was listed by the thegentlemen ransomware operation (United Kingdom), 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 Greenbrook Engineering breach?

thegentlemen published data attributed to Greenbrook Engineering. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Greenbrook Engineering

Claimed by Thegentlemen · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedOct 9, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: United Kingdom
Sector: Manufacturing
Listed on leak site: Oct 9, 2026

About the victim

AI dossier — public-source company profile

Greenbrook Engineering is a U.S.-based engineering services firm founded in 2000, headquartered in Middlesex, New Jersey, with offices across India. The company specializes in steel detailing, connection design, BIM coordination, and HVAC design for the construction industry, having completed 3,000+ projects over 25 years with an estimated annual revenue of $20–30M.

Industry: Engineering Services & Steel Detailing
Address: Middlesex, New Jersey, USA (headquarters); offices in Bengaluru, Chennai, Nashik, Mysuru, India
Employees: 350-756
Founded: 2000

Attack summary

Severity: low — The disclosure contains only an announcement and company profile with no proof files, screenshots, or concrete evidence of data exfiltration or encryption. No specific data types or operational impact are documented in the leak post.

The thegentlemen group claims to have conducted an attack on Greenbrook Engineering. The leak post does not specify whether data was encrypted, exfiltrated, or both, nor does it detail what specific data categories are at stake.

low

What the group claims

greenbrookengineering.com zoominfo.com/c/greenbrook-engineering/346757767 Greenbrook Engineering Services is a private, MBE-certified steel detailing and engineering firm founded in 2000, headquartered in Middlesex, New Jersey, with 5 offices in India (Bengaluru, Chennai, Nashik, Mysuru). It employs 350–756 people (mostly offshore in India) and generates estimated group revenue of $20–30M/year, with the India entity alone growing +22% YoY (₹25.3 crore FY2025). Over 25 years it has completed 3,000+ projects (Hollywood Burbank Airport, semiconductor fabs, Fiat Chrysler, military bases) with capacity of 50,000+ engineering hours per month. Core services: steel detailing, PE-stamped connection design, BIM coordination, and HVAC using Tekla/SDS2. It is the only steel detailing firm in the world with Great Place to Work certification and won Trimble's "Feature Company of the Month" (2025) and the NISD Detailing Edge Award (2026). Led by Chairman Mukul Mehta (Wharton PhD) and MD Vasan H.R.K.

Sources

Victim sitegreenbrookengineering.com

Source

Indexed 5 hours 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 960 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post October 9, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

October 9, 2026Greenbrook Engineering listed by thegentlemen on the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 960 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 Manufacturing sector, which has 3,699 disclosures indexed across all operators we track. Geographically, Greenbrook Engineering is reported in United Kingdom, a country with 377 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Greenbrook Engineering 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.
Report the incident to your national CERT, NCSC (United Kingdom), as required for your jurisdiction.
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.