Echigo Natural GasRyomo Systems

2LowPossibleAnnounced

A ransomware attack on its system vendor Ryomo Systems may have leaked about 1,000 customer records. Account and card numbers were not included.

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
Via a vendor or service, Ransomware
Operational impact
None

Data involved

DataStatusCountGroupEvidence
NamePossible leakabout 1,000 records—Source(opens in a new tab)
Postal addressPossible leakabout 1,000 records—Source(opens in a new tab)
User or member IDPossible leakNot disclosed—Source(opens in a new tab)
Payment detailsPossible leakNot 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

  • Check your card statements
  • 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. システムサービス提供事業者へのサイバー攻撃に関するお詫びとお知らせechiten-gas.co.jp · Published 2026-10-09(opens in a new tab)