INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Advantest Discloses Data Breach Months After Ransomware Attack

| 2026-10-07 12:37 HIGH LOW RANSOMWARE & EXTORTION DATA BREACH
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Executive Summary
AI-generated
A data breach at Advantest, a Japanese chip testing giant, occurred in February 2026 when hackers breached the company's network and deployed ransomware. The attackers stole personally identifiable information from more than 500 California residents, as well as individuals in Massachusetts and Vermont, with notifications submitted to attorneys general listing 8 affected residents each. Advantest has informed individuals that their stolen data includes names, dates of birth, contact information, SSNs, passport and driver’s license numbers, and medical and financial information. The company stated it had no information suggesting the PII was disclosed publicly or misused, but warned of increased risk of identity theft or fraud.
Technical Mitigations AI-generated
• Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
JP
Incident Timeline
‎February 2026
Threat actors stole personally identifiable information from Advantest's network in a ransomware attack disclosed in February 2026.
tactic Ransomware
Japanese chip testing giant Advantest is informing individuals that hackers stole personal information in the ransomware attack disclosed in February 2026.
target_region Japan
Japanese chip testing giant Advantest is informing individuals that hackers stole personal information in the ransomware attack disclosed in February 2026.
organisation Advantest
Japanese chip testing giant Advantest is informing individuals that hackers stole personal information in the ransomware attack disclosed in February 2026.
organisation General’s Office
The company has not disclosed how many individuals were impacted by the data breach, but its filing with the California Attorney General’s Office indicates that more than 500 California residents are affected.
organisation Intel
Advantest, which makes automatic test equipment for chipmakers such as Intel and Samsung, said in February that hackers had breached its network and deployed ransomware.
organisation Samsung
Advantest, which makes automatic test equipment for chipmakers such as Intel and Samsung, said in February that hackers had breached its network and deployed ransomware.
organisation PII
“We have no information suggesting that your PII has been disclosed publicly or otherwise misused,” Advantest said.
‎2026/10/07
Threat actors launched a ransomware attack on Advantest, resulting in the subsequent disclosure of a data breach months later.
organisation Advantest Discloses Data Breach Months
Advantest Discloses Data Breach Months
Intelligence Sources
SecurityWeek 2026-10-07