Advantest Confirms Customer Personal Data Stolen in February 2026 Ransomware Attack
Advantest Corporation is notifying affected individuals that their personal information was stolen during a ransomware attack earlier this year.
The Japanese company is a global manufacturer of automated test equipment for the semiconductor industry. On February 15, 2026, an attacker infiltrated Advantest’s network and accessed some of its systems.
Initial disclosures said that hackers had gained access to parts of the company’s network and deployed ransomware. However, Advantest could not determine at the time whether customer or employee data had been affected.
Advantest confirms data was extracted
In a data breach notification dated October 6, 2026, Advantest acknowledged that information was stolen during the attack.
“In February 2026, Advantest became aware of a cybersecurity incident in which an unauthorized third party gained access to Advantest’s systems and extracted some data from our servers,” the company said in the notification.
“The data extracted from our servers included PII (Personally Identifiable Information) belonging to our customers.”
What information was exposed?
The types of personal information identified in the notification include:
- Contact address
- Date of birth
- Social Security number (SSN)
- National ID number
- Driver’s license number
- Passport number
- Medical information
- Financial information
- Other identification numbers
It remains unclear whether the compromised data belongs to customers, employees, partners, or a combination of these groups.
BleepingComputer contacted Advantest to ask how many individuals were affected but did not receive a response by the time of publication.
Advantest offers 18 months of identity monitoring
Although Advantest says it has no information that the stolen data has been leaked or misused, the company acknowledges that affected individuals face an increased risk of identity theft and fraud.
To help mitigate that risk, Advantest is providing instructions for signing up for Kroll’s free 18-month identity theft, credit, and web monitoring service. Letter recipients have until January 4, 2027, to activate the benefit.
Affected individuals should also closely monitor their accounts and financial statements for suspicious activity and report any unknown transactions to their bank.
People should remain alert for phishing attempts and avoid clicking links or opening attachments in unexpected messages. Do not send money or share sensitive information in response to email or text message requests.
No public ransomware claim identified
As of publication, BleepingComputer was unable to find any public complaints from ransomware groups claiming responsibility for targeting Advantest.
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Source: www.bleepingcomputer.com