Advantest confirms personal data stolen in ransomware attack

Advantest says a February 2026 ransomware attack stole SSNs, IDs, and medical and financial data; no group has claimed it.

Japanese semiconductor test-equipment maker Advantest said an unauthorized party accessed its systems on February 15, 2026, deployed ransomware, and extracted personal data, which it detailed in an October 6, 2026 notice. Stolen information includes names, contact details, dates of birth, Social Security and national ID numbers, driver's licenses, passports, and medical and financial records. Advantest says it has no evidence the data was leaked, published, or misused, and is offering 18 months of free Kroll identity monitoring through January 4, 2027. No ransomware group has publicly claimed responsibility. Both reports say the total number of affected people was not disclosed; SecurityWeek additionally cites state filings covering more than 500 California residents, 14 in Massachusetts, and 8 in Vermont.