Was Hydrometrics hit by ransomware?

Hydrometrics was listed by the thegentlemen ransomware operation (United States), 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 Hydrometrics breach?

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

Ransomware victim disclosure

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Hydrometrics, Inc.

listed as Hydrometrics · Claimed by Thegentlemen · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedJan 31, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Jan 31, 2026

About the victim

AI dossier — public-source company profile

Hydrometrics, Inc. is an environmental and civil engineering firm based in Montana, with operations in Helena, Billings, Kalispell, and surrounding communities. The company has been in operation for over 40 years and provides services including water resources and hydrogeology, mine permitting and compliance, mine reclamation, solid and hazardous waste management, and stormwater and wastewater systems design. It serves municipal, industrial, and environmental clients across Montana and the broader United States.

Industry: Civil & Environmental Engineering Services
Address: Helena, Montana, United States

Attack summary

Severity: high — Status is data_published, indicating confirmed exfiltration and public release of company data. The firm handles environmental compliance, mine permitting, and regulated environmental projects, meaning data could include sensitive regulatory, client, and project documentation. No ransom amount or specific data volume is stated, but the published-data status elevates severity to high.

The ransomware group 'thegentlemen' has listed Hydrometrics, Inc. as a victim with a disclosed status of data_published, indicating data has been exfiltrated and published. The leak post content was inaccessible due to a bot-verification challenge, so specific claims about encrypted or exfiltrated data cannot be confirmed from the post itself.

high

Data the group says was taken

AI dossier — extracted from the leak post

Engineering project files
Environmental compliance documentation
Client records
Business data

What the group claims

www.hydrometrics.com https://www.zoominfo.com/c/hydrometrics-inc/18513967 Hydrometrics, Inc. is a Montana-based company that offers professional scientific and engineering services to industrial, commercial, municipal, and private sectors throughout the United States. With over 40 years of experience, they specialize in civil and environmental engineering, water resources and hydrogeology, mine permitting and compliance, and hazardous waste management. Their interdisciplinary approach ensures client satisfaction through reliable and effective solutions tailored to specific project needs. Hydrometrics is committed to empowering environmental responsibility and delivering dependable results.

The leak post

captured from the group's site

Gentlecloud Protection 🛡️ Gentlecloud Verifying your browser... Initializing security checks... I'm not a bot

Sources

Victim sitewww.hydrometrics.com
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 4 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

January 31, 2026Hydrometrics 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 Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Hydrometrics is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Hydrometrics 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.