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Shiraume Hospital Ransomware Attack

shiraume.or.jpRansomed

netrunnerGroup

JapanCountry

Apr 3, 2026Discovered

Overview

View group profile

Domain

shiraume.or.jp

Industry

Healthcare

Country

Japan

Discovered

6 months ago

Attack date

Apr 3, 2026

Confidence

100%

Severity

Medium

Status

Claimed

Threat group

netrunner

Total victims

First seen

Apr 2026

Last seen

Oct 2026

Threat level

3.4/10

Aggressiveness5.5/10

Lethality0/10

Criticality4.8/10

Status breakdown

Claimed

this victim

100.0%17

Targeted sectors

Healthcare Hospitality Manufacturing Other Technology Transportation

Victim's position within group

Industry

Healthcare

Known target sector

Country

Japan

Not a listed target country

Other victims

View all (17)

Same group · netrunner

Mid Atlantic Gynecologic Oncology and Pelvic Surgery Associates (MAGOPSA)
United States
Claimed
Precon Marine
United States
Claimed
Main Place Mall
Malaysia
Claimed
Nippon Medical School Musashi Kosugi Hospital
—
Claimed
Shiraume Hospital
Japan
Claimed
Seoyon E-Hwa
—
Claimed

Group activity

Monthly attacks · netrunner

total · avg 5.7/mo