Was MBM hit by ransomware?

MBM was listed by the thegentlemen ransomware operation (Poland), 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 MBM breach?

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

Ransomware victim disclosure

← All victims

MBM sp. z o.o. sp. k.

listed as MBM · Claimed by Thegentlemen · listed 5 months ago

Age

since listed · data leaked

Status timeline

ListedJan 24, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Poland
Listed on leak site: Jan 24, 2026

About the victim

AI dossier — public-source company profile

MBM sp. z o.o. sp. k. is a Polish professional services firm headquartered in Gliwice, with an additional branch in Bielsko-Biała. The company provides compliance training, GDPR implementation, occupational health and safety (BHP) audits, and data protection documentation services to clients across the education, public administration, and business sectors throughout Poland.

Industry: Compliance Training & Data Protection Consulting
Address: ul. Łabędzka 22, Gliwice, Poland

Attack summary

Severity: high — The victim is a GDPR and data protection consultancy whose systems likely contain sensitive personal data of numerous clients from education, government, and business sectors. Data_published status indicates exfiltration has occurred; exposure of a compliance firm's client PII and documentation carries significant regulatory and reputational risk.

The group 'thegentlemen' claims to have attacked MBM and lists the disclosure status as data_published, indicating exfiltration and publication of data; however, the leak post content was blocked by an anti-bot verification page and no specific data claims or proof details are directly visible.

high

Data the group says was taken

AI dossier — extracted from the leak post

Client data protection documentation
GDPR compliance records
Training certificates and materials
Personal data of training participants
Internal business documents

What the group claims

https://mbm.edu.pl MBM is a Polish company specializing in professional training, compliance support, and implementation of mandatory procedures for both public institutions and private organizations across the country. They have over eight years of experience delivering vocational training, advisory services, audits, and ready‑to‑use documentation tailored to legal requirements, particularly in areas such as data protection and workplace obligations. Their services include courses on personal data protection and assistance in meeting the requirements of current data privacy laws, helping clients align with GDPR‑related duties and other legal obligations concerning handling and safeguarding personal information.

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 sitembm.edu.pl
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 5 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

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 24, 2026MBM 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

Geographically, MBM is reported in Poland, a country with 7 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means MBM 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.