Advantest confirms personal information stolen in ransomware attack

Advantest Corporation is notifying affected individuals that a ransomware attack earlier this year exposed their personally identifiable data.

The Japanese company is a global manufacturer of automated test equipment for the semiconductor industry. On February 15, a threat actor breached its network and gained access to some of its systems.

At the time, the disclosure noted that hackers had accessed parts of its network and deployed a ransomware payload, but the company could not determine if customer or employee data had been impacted.

In a data breach notification dated October 6, 2026, Advantest confirms that data was stolen in the attack.

“In February 2026, Advantest became aware of a cybersecurity incident in which an unauthorized third party accessed Advantest systems and extracted some data from our servers,” reads the notification.

“The data extracted from our servers included PII (personally identifiable information) belonging to you.”

The data types that have been exposed include the following:

• Contact information
• Date of birth
• Social Security Number (SSN)
• National ID number
• Driver’s License
• Passport number
• Medical information
• Financial information
• Other ID numbers

It is unclear whether the compromised data belongs to customers, employees, partners, or a combination of these groups.

BleepingComputer has contacted Advantest with questions about the number of affected individuals, but we have not received a response as of publication.

The company states that it has no information that the compromised data has been leaked or otherwise misused, although it recognizes the elevated risk of identity theft and fraud for exposed individuals.

To mitigate this risk, the firm provides instructions on how to enroll in free 18-month identity theft, credit, and web monitoring services from Kroll, giving letter recipients until January 4, 2027, to activate the offer.

In addition to enrolling in this service, impacted individuals are recommended to closely monitor their accounts and financial statements for suspicious activity and report any unknown transactions to their bank.

Also, it is advisable to be cautious about phishing attempts, avoid clicking links or opening attachments, and never send money or share sensitive information in response to requests made via email or text.

At the time of writing, BleepingComputer could not find any public claims from ransomware groups targeting Advantest.