Was Holborn European Marketing hit by ransomware?

Holborn European Marketing was listed by the thegentlemen ransomware operation (Cyprus), 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 Holborn European Marketing breach?

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

Ransomware victim disclosure

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Holborn European Marketing

Claimed by Thegentlemen · listed 1 day ago

Age

since listed · data leaked

Status timeline

ListedAug 7, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Cyprus
Sector: Professional Services
Listed on leak site: Aug 7, 2026

About the victim

AI dossier — public-source company profile

Holborn European Marketing Company Limited is a Cyprus-registered energy trading firm established in 1987, headquartered in Larnaca. The company purchases crude oil and feedstocks, sells refined petroleum products (diesel, gasoline, heating oil, heavy fuel oil, propane, butane, and specialty chemicals), and operates an 80,000 bbl/day refinery in Hamburg, Germany, serving as a major oil product supplier in Northern Germany with approximately 5% market share.

Industry: Energy Trading & Petroleum Products Distribution
Address: Miranda Court No. 1 Ipirou Street No. 28, 6031 Larnaca, P.O. Box 40897, 6307 Larnaca, Cyprus
Founded: 1987

Attack summary

Severity: medium — Disclosure status indicates data published, suggesting exfiltration occurred. However, no proof files, data inventory, or specific sensitive data types are described in the available post excerpt. Energy/oil trading firms typically hold commercially sensitive operational and financial data; scale and sensitivity are unconfirmed.

The ransomware group 'thegentlemen' claims to have compromised Holborn European Marketing. No specific details are provided regarding encryption, exfiltration, or data types targeted in the truncated leak post.

medium

What the group claims

holborn.com.cy zoominfo.com/c/holborn-european-marketing-company-ltd/462273998 Holborn European Marketing Company Limited is a Cyprus-based energy trading firm established in 1987, operating from its headquarters in Larnaca. The company specializes in purchasing crude oil and feedstocks, selling refined petroleum products, and active oil trading. It serves as a major energy supplier that fulfills local market needs in Cyprus while also maintaining a significant operational presence as a key oil products supplier in Northern Germany.

Sources

Victim siteholborn.com.cy

Source

Indexed 1 day 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 724 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post August 7, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

August 7, 2026Holborn European Marketing listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 724 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 Professional Services sector, which has 13 disclosures indexed across all operators we track. Geographically, Holborn European Marketing is reported in Cyprus, a country with 8 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Holborn European Marketing 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.