YCC Information SystemsYamagata City and other municipalities
1MinorInvestigatingAnnounced
A ransomware attack on a municipal systems vendor may have exposed resident, tax and insurance data of local governments, partly including My Number and salary information.
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, Via a vendor or service
Occurred
2026-04-02
Sector
Public sector
Operational impact
None
##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 2026-10-24Read the review