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Nationalmuseet Ransomware Attack

natmus.dkRansomed

thegentlemenGroup

DenmarkCountry

Jun 15, 2026Discovered

Overview

View group profile

Domain

natmus.dk

Industry

Government & Defense

Country

Denmark

Discovered

about 2 months ago

Attack date

Jun 15, 2026

Confidence

100%

Severity

Medium

Status

Claimed

Threat group

thegentlemen

Total victims

394

First seen

Aug 2025

Last seen

Aug 2026

Group status

active

Sophistication

Impact score

Threat level

4.3/10

Aggressiveness10/10

Lethality0.1/10

Criticality2.6/10

Status breakdown

Data Leaked0.8%3

Negotiating0.3%1

Claimed

this victim

99.0%390

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

Government & Defense

Known target sector

Country

Denmark

Frequently targeted country

Other victims

View all (394)

Same group · thegentlemen

Group activity

Monthly attacks · thegentlemen

394

total · avg 30.3/mo