Was Leiblein & Kollegen Steuerberatungsgesellschaft hit by ransomware?

Leiblein & Kollegen Steuerberatungsgesellschaft was listed by the Losttrust 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 Losttrust ransomware group?

Losttrust 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 Leiblein & Kollegen Steuerberatungsgesellschaft breach?

Losttrust published data attributed to Leiblein & Kollegen Steuerberatungsgesellschaft. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Leiblein & Kollegen Steuerberatungsgesellschaft

Claimed by Losttrust · listed 3 years ago

$1M

Ransom

demanded

34m

Age

since listed · data leaked

Status timeline

ListedSep 26, 2023
Data leakeddate unknown

At a glance

Group: Losttrust
Status: Data leaked
Country: Germany
Sector: Business Services
Listed on leak site: Sep 26, 2023
Ransom demanded: $1M

About the victim

AI dossier — public-source company profile

Leiblein & Kollegen Steuerberatungsgesellschaft mbH is a tax advisory and accounting firm headquartered in Aschaffenburg, Bavaria, Germany. The firm offers a range of services including financial bookkeeping, payroll accounting, annual financial statements, corporate tax advice, and business consulting for freelancers and small-to-medium-sized enterprises. The firm reports over 20 years of professional experience and employs more than 20 staff.

Industry: Tax Advisory & Accounting Services
Address: Aschaffenburg, Bayern, Germany
Employees: 11-20

Attack summary

Severity: critical — The firm is a tax and accounting practice handling regulated financial and personal data (PII, payroll, tax filings) for numerous individual and corporate clients. Data publication by the threat actor means sensitive financial and personal records of third-party clients are likely exposed at scale, meeting the threshold for critical severity.

The Losttrust ransomware group claims to have compromised Leiblein & Kollegen Steuerberatungsgesellschaft mbH and has published data (disclosed status: data_published), with a stated ransom demand of $1 million. The nature of exfiltrated data has not been explicitly detailed in the post, but the firm's operations involve extensive client financial, tax, and payroll records.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client tax records
Financial statements
Payroll data
Business accounting records
Personal financial information of individual clients
Corporate financial data

What the group claims

Leiblein & Kollegen Steuerberatungsgesellschaft mbH is a company that operates in the Accounting industry. It employs 11-20 people and has $1M-$5M of revenue. The company is headquartered in Aschaffenburg, Bayern, Germany

Sources

Victim sitesteuerberater-aschaffenburg.eu

Source

Indexed 3 years 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 Losttrust

Losttrust is a relatively new ransomware group that emerged in September 2023, operating with apparent financial motivations and demonstrating a broad international targeting scope across multiple sectors. The group's origin and affiliations remain largely undocumented by major threat intelligence organizations, with limited public reporting from established security firms regarding their operational structure or potential ransomware-as-a-service connections. Based on available victim data, Losttrust appears to employ opportunistic targeting methods, having compromised 53 known victims across diverse geographic regions including the United States, Italy, Germany, Argentina, and India, with particular focus on education, legal services, media organizations, food and agriculture companies, and government entities. The specific attack methodologies, initial access vectors, encryption techniques, and extortion tactics employed by Losttrust have not been extensively documented in public threat intelligence reports from major security vendors or law enforcement agencies. Given the group's recent emergence and limited visibility in established threat intelligence channels, their current operational status and activity levels remain unclear, though the breadth of their reported victim base suggests ongoing operations as of recent observations. The group has been linked to 53 public disclosures across our corpus. First observed on a leak site on September 26, 2023. The operation is currently inactive.

Also tracked as: LOST TRUST.

Timeline of this disclosure

September 26, 2023Leiblein & Kollegen Steuerberatungsgesellschaft listed by Losttruston the group's public leak site

Ransom demanded: $1M

Other recent disclosures by Losttrust

Losttrust has been linked to 53 public victims on Darkfield. A sample of the most recent:

See the full Losttrust 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, Leiblein & Kollegen Steuerberatungsgesellschaft is reported in Germany, a country with 926 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Losttrust means Leiblein & Kollegen Steuerberatungsgesellschaft 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 Losttrust'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.