IDC FrontierIDCF Cloud

3MediumConfirmedAnnounced Updated

A ransomware attack disrupted IDCF Cloud zones. Separately, the cloud portal records of 48 companies were improperly viewed. No data exfiltration has been confirmed.

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, Unauthorized access
Occurred
2026-10-07
Sector
IT, cloud & telecom
Operational impact
Core operations stopped

Data involved

DataStatusCountGroupEvidence
User or member IDAccess confirmed48 companies—Source(opens in a new tab)
PasswordAccess confirmedNot disclosed—Source(opens in a new tab)
Email addressAccess 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

  • Change your password
  • Change the password on other services where you reused it
  • 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

Suricata

Impact Reaches others
OISF/suricata

An intrusion detection and prevention engine (IDS/IPS) that matches network traffic against rules and records suspicious activity as alerts.

Purpose
Defense
Type
Self-hosted server
Difficulty
Intermediate
License
CopyleftGPL-2.0
Category
Network
Actively updatedstars6,773Last update 2026-10-23
Read the Suricata review

Sources

  1. 【第2報】当社サービスの一部システムに対する不正アクセスについてwww.idcf.jp · Published 2026-10-07(opens in a new tab)
  2. 【重要】一部サービス停止のお知らせ(IDCFクラウドの障害による影響)www.greenwich.co.jp · Published 2026-10-07(opens in a new tab)
  3. 【重要】UDトーク 一部機能の障害についてudtalk.jp · Published 2026-10-07(opens in a new tab)
  4. 【第2報】委託先クラウドサービス事業者のシステム障害に伴う弊社サービスへの影響と対応状況についてwww.cyber-u.ac.jp · Published 2026-10-08(opens in a new tab)
  5. 【第3報】当社サービスの一部システムに対する不正アクセスについてwww.idcf.jp · Published 2026-10-08(opens in a new tab)
  6. 【第4報】当社サービスの一部システムに対する不正アクセスについてwww.idcf.jp · Published 2026-10-09(opens in a new tab)
  7. 当社サービスの一部システムに対する不正アクセスについてwww.idcf.jp · Published 2026-10-07(opens in a new tab)
  8. 【第5報】不正アクセスによる障害に関する調査の進捗についてwww.idcf.jp · Published 2026-10-14(opens in a new tab)