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Katholiek Amersfoort Ransomware Attack

katholiekamersfoort.nlRansomed

stormousGroup

NetherlandsCountry

Jun 2, 2026Discovered

Overview

View group profile

Domain

katholiekamersfoort.nl

Industry

Education

Country

Netherlands

Discovered

3 months ago

Attack date

Jun 2, 2026

Confidence

85%

Severity

Medium

Status

Claimed

Threat group

stormous

Total victims

First seen

Oct 2025

Last seen

Jul 2026

Group status

active

Sophistication

Impact score

Threat level

2.2/10

Aggressiveness5/10

Lethality0.3/10

Criticality1.2/10

Status breakdown

Data Leaked6.8%4

Claimed

this victim

93.2%55

Targeted sectors

Education Energy & Utilities Financial Services Government & Defense Healthcare Hospitality Manufacturing Other Professional Services Retail & E-Commerce Technology Transportation

Victim's position within group

Industry

Education

Known target sector

Country

Netherlands

Frequently targeted country

Other victims

View all (59)

Same group · stormous

Group activity

Monthly attacks · stormous

total · avg 7.4/mo