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
- Detected 2025-01-21
- Disclosed 2025-02-07
- 17 days
Attack or cause
- Method
- [Ransomware]
- Impact
- [Service outage][Data leak]
- Entry point
- Unknown
Data exposed or at risk
–
Organizations involved
[Breached][Major]Osaka, Osaka, ChuoFinance and insurance20,000 leaked
Oumiya, Ltd.
Sources
- [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][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