> JapanHacked_
[Resolved][Severity: Major][Ransomware]

Oumiya: ransomware attack

Server disruption and encryption were identified on January 21 and disclosed February 7. The March 19 report could not rule out access to about 20,000 personal records but found no clear evidence of exfiltration. Servers had recovered, with no current operational impact or confirmed secondary harm.

Disclosed

2025-02-07

Organizations involved

1

Leaked or at risk

20K

20,000

Downtime

Unknown

Timeline

  1. Detected 2025-01-21
  2. Disclosed 2025-02-07
  3. 17 days

Attack or cause

Method
[Ransomware]
Impact
[Service outage][Data leak]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]ランサムウェア被害発生についてのお知らせ(初報)Oumiya, Ltd. · 2025-02-07
  2. [2][Official]当社サーバーへの不正アクセスに関するお知らせ(続報)Oumiya, Ltd. · 2025-03-19