Ransomware victim disclosure

Katholiek Amersfoort

listed as katholiekamersfoort.nl · Claimed by stormous · listed 1 day ago

Age

since listed · data leaked

Status timeline

Listed
Jun 2, 2026
Data leaked

At a glance

Group: stormous
Status: Data leaked
Country: NL
Sector: Education
Listed on leak site: Jun 2, 2026

About the victim

AI dossier — public-source company profile

Katholiek Amersfoort is a Catholic religious organization based in Amersfoort, Netherlands, operating a website serving the local Catholic community with educational and parish services.

Industry: Religious Organization & Education

Attack summary

Severity: high — Confirmed exfiltration of 10 GB of PII at scale (donors, staff, members), plus internal organizational data and system metadata. Large-scale personal data exposure of sensitive community information.

The Stormous group claims to have breached the organization's network and exfiltrated over 10 GB of data including databases, PII of donors and staff, internal documents, contact lists, and board/committee records.

high

Data the group says was taken

AI dossier — extracted from the leak post

Donor personal information
Staff records
Member PII
Databases
Internal documents and network shares
Contact lists
Board and committee data
System metadata

What the group claims

The church website's network (katholiekamersfoort.nl/) has been breached, resulting in the exfiltration of over 10 GB of data. This data pertains to donors, staff, and the personal information of a large number of individuals. The compromised data includes: Databases and Personally Identifiable Information (PII), internal network shares and document, contact lists, board and committee data, as well as system metadata.

Sources

Victim sitekatholiekamersfoort.nl

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 stormous

Stormous is a relatively new ransomware group that emerged in March 2022, operating primarily with financial motivations and has claimed responsibility for attacks against at least 165 victims across multiple countries and sectors. The group's country of origin remains unclear from publicly documented sources, though their operational patterns suggest they may operate as an independent entity rather than a established ransomware-as-a-service model. Limited public documentation from major security firms indicates the group employs common ransomware tactics, though specific details about their initial access vectors, encryption methods, and data exfiltration practices have not been extensively detailed in reports from CISA, FBI, or major threat intelligence providers. Their targeting appears geographically diverse with a focus on Spain, the United States, France, UAE, and Brazil, while showing particular interest in technology, hospitality and tourism, government, and business services sectors, though many of their victims span unspecified industries. As of current reporting, Stormous appears to remain an active threat, though the limited public documentation suggests they operate as a lower-tier ransomware group compared to more prominent families that receive extensive coverage from major security research organizations. The group has been linked to 222 public disclosures across our corpus. First observed on a leak site on March 22, 2022; most recent post June 2, 2026. The operation is currently active.

Timeline of this disclosure

June 2, 2026katholiekamersfoort.nl listed by stormouson the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, katholiekamersfoort.nl is reported in NL, a country with 24 ransomware disclosures in our corpus.

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.