The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Seiko Group confirmed that a ransomware attack compromised approximately 60,000 items of personal data in 2023. Kaspersky ICS-CERT later reported that the AlphV/Black Cat ransomware group claimed responsibility and shared screenshots of purported stolen files. Seiko’s notices did not identify the group, and the available sources do not establish a new leak in 2026.
What happened in the Seiko data breach?
Seiko Group Corporation said it detected unauthorized access to some servers on July 28, 2023, and later identified the incident as a ransomware attack. In its October 25 report, the company said its review with cybersecurity experts confirmed that approximately 60,000 items of personal data held by Seiko Group Corporation, Seiko Watch Corporation, and Seiko Instruments Inc. had been compromised. Seiko Group’s October 25, 2023 report
What data did Seiko say was compromised?
Seiko listed several categories of information. The company’s list does not mean every affected record contained every field.
- Seiko Watch customer names, addresses, telephone numbers, and/or email addresses.
- Contact details for business counterparties.
- Employment applicant information, including educational background.
- Personnel information for current and former employees.
Seiko explicitly said customer credit-card information was not compromised. Seiko Group’s October 25, 2023 report
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Who said the data was being leaked?
Seiko’s notices confirmed ransomware and a data breach but did not name a ransomware group. Kaspersky ICS-CERT’s 2024 retrospective says AlphV/Black Cat claimed responsibility on August 21, 2023, and shared screenshots of purported stolen files. That is a claim attributed to the group by Kaspersky, not a forensic attribution made by Seiko. The retrospective does not establish the contents of every file depicted in those screenshots. Kaspersky ICS-CERT’s H2 2023 incident overview
Seiko ransomware incident timeline
- July 28, 2023: Seiko detected unauthorized access to some servers. The company later classified the incident as ransomware.
- August 10, 2023: Seiko announced a possible breach and said it was investigating with outside cybersecurity experts.
- August 21, 2023: Kaspersky ICS-CERT says AlphV/Black Cat claimed responsibility and shared screenshots of purported stolen files.
- August 22, 2023: Seiko confirmed ransomware and said information relating to some business partners and employees had leaked. It also said it had reported the incident to Japan’s Personal Information Protection Commission and was working with law enforcement.
- October 25, 2023: Seiko reported the results of its review, including the approximately 60,000 compromised personal-data items.
Seiko’s August 22, 2023 notice · Seiko’s October 25, 2023 report
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How did Seiko respond?
Seiko said it temporarily blocked external communications with affected servers, installed endpoint detection and response (EDR) systems across servers and PCs, and introduced measures including multi-factor authentication. It also said it was working with external cybersecurity experts, continuing its investigation, and contacting affected people individually. Seiko Group’s October 25, 2023 report
What should potentially affected customers or stakeholders do?
In its August 2023 notice, Seiko asked customers and stakeholders who received suspicious emails or notifications not to open them or click links, and to contact the company. That was the company’s guidance at the time; the cited notices do not provide individualized current advice for people who may have been affected. Seiko’s August 22, 2023 notice
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Does this indicate a new Seiko leak in 2026?
No new 2026 leak is established by the available reports. They describe the 2023 incident and the subsequent disclosure and reporting about it. The “starts leaking” claim refers to the group’s reported 2023 activity, not evidence of a fresh leak now.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
