Was CMS Legal Services EEIG hit by ransomware?

CMS Legal Services EEIG was listed by the crypto24 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 crypto24 ransomware group?

crypto24 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 CMS Legal Services EEIG breach?

crypto24 published data attributed to CMS Legal Services EEIG. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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CMS Legal Services EEIG

Claimed by Crypto24 · listed 11 months ago

11m

Age

since listed · data leaked

Status timeline

ListedAug 16, 2025
Data leakeddate unknown

At a glance

Group: Crypto24
Status: Data leaked
Country: Germany
Sector: Business Services
Listed on leak site: Aug 16, 2025

About the victim

AI dossier — public-source company profile

CMS is one of the largest international law firms with significant presence in Germany and globally. The firm provides comprehensive legal services across multiple sectors including corporate, finance, dispute resolution, intellectual property, and public commercial law, with offices across major German cities and international locations.

Industry: Legal Services & Law Firms
Address: Multiple locations in Germany (Berlin, Cologne, Düsseldorf, Frankfurt, Hamburg, Leipzig, Munich, Stuttgart) plus international offices
Employees: 500+
Founded: 1999

Attack summary

Severity: critical — Claimed exfiltration of highly sensitive data including government/infrastructure files, regulated financial records, tax authority access credentials, and personnel/payroll data from a major international law firm serving multinational and government clients. This represents exposure of regulated data at scale with significant regulatory, competitive, and national security implications.

The crypto24 group claims to have exfiltrated a large dataset containing highly confidential materials including government and national infrastructure project files, sensitive contracts with multinational corporations, tax authority system access records, internal financial and legal documents, payroll, and personnel information. The group threatens to publicly release the complete dataset.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Government project files
National infrastructure project files
Multinational corporation contracts
Tax authority system access records
Internal financial documents
Internal legal documents
Payroll records
Personnel information

What the group claims

We are in possession of highly confidential data belonging to CMS, one of the largest international law firms, including government and national infrastructure project files, sensitive contracts with multinational corporations, tax authority system access records, internal financial and legal documents, as well as payroll and personnel information. The complete dataset and its full file list will be publicly released in its entirety.

Sources

Victim sitecms.law

Source

Indexed 11 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.

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Disclosure context

About crypto24

Crypto24 is a recently emerged ransomware group first observed in April 2025, with a primary financial motivation evidenced by their targeting of high-value sectors across multiple geographic regions. The group's origin and affiliations remain unclear due to their recent emergence, though their targeting pattern suggests either independent operations or a new ransomware-as-a-service offering given the diverse geographic spread of their 43 documented victims. Their attack methodology and specific technical capabilities have not yet been thoroughly documented by major threat intelligence providers, though their targeting of technology, financial services, healthcare, and business services sectors indicates they likely employ common initial access vectors such as phishing or exploitation of public-facing applications to gain entry into victim networks. The group has demonstrated a preference for targeting organizations primarily in the United States while also conducting operations across Southeast Asia including Malaysia, Singapore, and Indonesia, as well as extending their reach to Egypt, suggesting either a globally distributed affiliate network or opportunistic targeting based on vulnerable infrastructure discovery. Crypto24 remains active as of the latest available intelligence reporting, though given their recent emergence, comprehensive details about their specific tactics, techniques, and procedures await further analysis by established cybersecurity research organizations. The group has been linked to 49 public disclosures across our corpus. First observed on a leak site on April 8, 2025; most recent post May 18, 2026. The operation is currently active.

Timeline of this disclosure

August 16, 2025CMS Legal Services EEIG listed by crypto24on the group's public leak site

Other recent disclosures by crypto24

crypto24 has been linked to 49 public victims on Darkfield. A sample of the most recent:

See the full crypto24 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, CMS Legal Services EEIG is reported in Germany, a country with 926 ransomware disclosures in our corpus.

If your organisation is affected

A listing by crypto24 means CMS Legal Services EEIG 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 crypto24'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.