Was Alexander Buch Bilanzbuchhalter hit by ransomware?

Alexander Buch Bilanzbuchhalter was listed by the thegentlemen ransomware operation (Germany), 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 Alexander Buch Bilanzbuchhalter breach?

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

Ransomware victim disclosure

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Alexander Buch Bilanzbuchhalter

Claimed by Thegentlemen · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedJun 20, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Germany
Sector: Business Services
Listed on leak site: Jun 20, 2026

About the victim

AI dossier — public-source company profile

Alexander Buch is a certified accountant (Bilanzbuchhalter) operating a professional accounting practice in Herne, Germany. The practice provides bookkeeping, payroll accounting, commercial consulting, startup support, and tax assistance to business and individual clients.

Industry: Accounting & Bookkeeping Services
Address: Herne, Germany

Attack summary

Severity: medium — Solo accountant practice with likely exposure of client financial and tax records (regulated sensitive data in Germany). No proof files explicitly mentioned, but data publication confirmed. Scale appears limited to a small practice.

The threat actor claims to have compromised Alexander Buch's practice and published data. No specific details are provided regarding what data was exfiltrated or whether systems were encrypted.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Client financial records
Accounting documentation
Tax information
Payroll data
Business records

What the group claims

***.de Alexander Buch is a certified accountant (Bilanzbuchhalter) based in Herne, Germany, offering professional financial services to both businesses and individuals. His practice specializes in ongoing bookkeeping, payroll accounting, commercial consulting, and comprehensive support for startup founders. Additionally, he provides dedicated tax assistance services, helping clients efficiently manage their financial obligations and regulatory requirements

Sources

Victim sitebuch-bilanzbuchhalter.de

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 517 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 20, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

June 20, 2026Alexander Buch Bilanzbuchhalter listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 517 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 Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, Alexander Buch Bilanzbuchhalter is reported in Germany, a country with 378 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Alexander Buch Bilanzbuchhalter 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, CERT-Bund (Germany), 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.