Higashiyama Sangyo

1MinorConfirmedAnnounced Updated

Ransomware was confirmed on March 6, 2026. The attacker gained administrator rights and spread across the network, and data seen externally in April included company information such as welfare equipment users' names, addresses and phones.

This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.

Cause
Ransomware
Sector
Healthcare
Operational impact
None

Data involved

DataStatusCountGroupEvidence
NameLeak confirmedNot disclosed—Source(opens in a new tab)
Postal addressLeak confirmedNot disclosed—Source(opens in a new tab)
Phone numberLeak confirmedNot disclosed—Source(opens in a new tab)

Counts are the figures the organization announced. Because the same person may be counted more than once, we do not add the rows together.

What users should do

  • Watch for emails and texts pretending to be the company

General steps based on the type of data involved. Check the organization’s notice or help line to see whether you are affected.

Tools for this kind of attack

Picked from the cause of the incident: tools that help you check your own systems for the same kind of weakness, or spot the warning signs.

Wazuh

Impact Local only
wazuh/wazuh

A free security platform (SIEM/XDR) that collects logs, configuration, and vulnerability data from agents on your endpoints and shows it all in one dashboard.

Purpose
Defense
Type
Self-hosted server
Difficulty
Advanced
License
CopyleftGPL-2.0(一部の構成要素は Apache-2.0)
Category
Vulnerability scanning / Forensics
Actively updatedstars17,410Last update 2026-10-24
Read the Wazuh review

Vuls

Impact Reaches others
future-architect/vuls

An agentless vulnerability scanner that checks the packages installed on a server and lists the ones affected by known CVEs.

Purpose
Defense
Type
Command line
Difficulty
Intermediate
License
CopyleftGPL-3.0
Category
Vulnerability scanning
Actively updatedstars12,302Last update 2026-10-21
Read the Vuls review

Sources

  1. 当社サーバー等へのランサムウェア攻撃に関するお知らせとお詫び(第4報)www.higashiyama.com · Published 2026-05-12(opens in a new tab)
  2. セキュリティ対策強化に関するご報告www.higashiyama.com · Published 2026-05-25(opens in a new tab)