Advantest has confirmed that attackers stole personal information during a ransomware attack discovered in February 2026, potentially exposing identity, medical and financial records.
The Japanese semiconductor-test equipment maker said in a data-breach notice dated October 6 that an unauthorized party accessed its systems and removed data from company servers. The potentially affected information varies by person and may include contact details, dates of birth, Social Security numbers, national identification numbers, driver’s-license details, passport numbers, medical information and financial records. Advantest first disclosed the incident on February 19, after detecting unusual activity on February 15, and said ransomware had been deployed on parts of its network.
At the time, the company had not determined whether customer or employee data had been taken. Advantest now says it has no evidence that the information has been publicly released or misused, but warned that affected people could face an increased risk of identity theft or fraud. The company said it isolated affected systems, strengthened security controls and restored its network after containing the incident.
It is offering eligible individuals 18 months of free credit and web monitoring through Kroll, with activation required by January 4, 2027.