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

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

  1. Disclosed 2026-01-22
  2. 1 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]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. [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