Sincere: ransomware attack
Sincere disclosed an outage on January 22 and confirmed ransomware and possible server-data exposure on January 29. Waste processing and cleaning continued, while order and document handling were delayed. Its February report said systems were rebuilt in a separate environment and normal operations resumed progressively from February 9. Scope and cause investigations continued.
Disclosed
2026-01-22
Organizations involved
1
Leaked or at risk
Unknown
Downtime
Unknown
Timeline
- Disclosed 2026-01-22
- 1 days
Attack or cause
- Method
- [Ransomware]
- Impact
- [Service outage][Data leak]
- Entry point
- Unknown
Data exposed or at risk
–
Organizations involved
[Breached][Major]Tokyo, ShinagawaOther services
Sincere Corporation
Sources
- [1][Official]サイバー攻撃によるシステム障害発生に関するお知らせ(第2報)Sincere Corporation · 2026-01-29
- [2][Official]サイバー攻撃によるシステム障害発生に関するお知らせ(第3報)Sincere Corporation · 2026-02-18