Was OHK Energy hit by ransomware?

OHK Energy was listed by the thegentlemen ransomware operation (Singapore), 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 OHK Energy breach?

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

Ransomware victim disclosure

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OHK Energy

Claimed by Thegentlemen · listed 19 days ago

18d

Age

since listed · data leaked

Status timeline

ListedJul 31, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Singapore
Sector: Energy & Utilities
Listed on leak site: Jul 31, 2026

About the victim

AI dossier — public-source company profile

OHK Energy is Ireland's largest renewable energy provider and retrofit specialist, registered with the Sustainable Energy Authority of Ireland (SEAI). The company designs and installs solar PV, heat pumps, battery storage, and EV chargers for residential, commercial, agricultural, and utility customers across Ireland and Northern Ireland. They have avoided over 301,014 tonnes of CO2 emissions through installed products and are recognized as one of Ireland's Best Managed Companies.

Industry: Renewable Energy Installation & Retrofit Services
Address: Ireland

Attack summary

Severity: low — No proof files, screenshots, or specific data types are advertised in the leak post. The disclosure appears to be a listing/announcement only with no evidence of operational disruption or data publication. No ransom demand stated.

The ransomware group thegentlemen claims to have compromised OHK Energy. The leak post provides company profile information but does not explicitly state what data was exfiltrated, encrypted, or what operational impact occurred.

low

What the group claims

ohkenergy.com rocketreach.co/ohk-energy-profile_b6d2700bc7449e3f OHK Energy is Ireland’s largest and most trusted renewable energy provider and retrofit specialist, registered with the Sustainable Energy Authority of Ireland (SEAI). The company specializes in designing and installing solar PV, heat pumps, battery storage, and EV chargers for homeowners, businesses, farms, and communities. With a service-driven and future-focused approach, OHK Energy is dedicated to building a cleaner, more sustainable island by delivering tailored, high-quality energy solutions

Sources

Victim siteohkenergy.com

Source

Indexed 19 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.

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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 756 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post August 14, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

July 31, 2026OHK Energy listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 756 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 Energy & Utilities sector, which has 168 disclosures indexed across all operators we track. Geographically, OHK Energy is reported in Singapore, a country with 45 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means OHK Energy 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, SingCERT (Singapore), 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.