Ransomware Attack Disrupts Multiple Systems at Japanese Semiconductor Supplier

Advantest Corporation, a top Japanese supplier of semiconductor testing equipment, disclosed a ransomware attack that struck its IT systems on February 15, 2026.

The Tokyo-based firm, listed on the Tokyo Stock Exchange (TSE: 6857), detected unusual activity and quickly isolated affected areas.

This incident highlights growing cyber threats to critical supply chains in the semiconductor industry, which powers everything from 5G networks to AI chips.

Advantest activated its incident response plan right away. The company brought in third-party cybersecurity experts to probe the breach.

Early signs point to an unauthorized intruder who slipped into parts of the network and unleashed ransomware.

No details yet on the exact malware strain or the attack vector, such as phishing or exploited vulnerabilities.

Advantest stressed that the probe continues, with a focus on checking for data theft involving customers or staff. If confirmed, those affected will get direct notices and steps to protect themselves.

The firm assured stakeholders it has bolstered defenses during the response. Operations may face disruptions, especially in R&D or production lines reliant on tested systems.

Advantest manufactures automatic test gear essential for semiconductors used in IoT devices, autonomous cars, high-performance computing, and AI.

A prolonged outage could ripple through global chipmakers, delaying innovations in these high-stakes fields. The company pledged regular updates via its news page at https://www.advantest.com/en/news/.

Japanese Semiconductor Giant Advantest Hit

TOKYO, Japan – February 19, 2026 – Advantest Corporation (TSE: 6857), a leading supplier of semiconductor test equipment, revealed it is tackling a ransomware incident that impacted parts of its IT network.

Detected on February 15 (JST), the breach prompted swift action to contain the threat.

Advantest spotted odd activity in its systems and locked down affected segments without delay. The company enlisted top cybersecurity firms for a deep dive into the intrusion.

Initial reports suggest a rogue actor infiltrated the network and rolled out ransomware, potentially encrypting files for ransom demands.

While no ransom note or group claim has surfaced publicly, experts watch for ties to known players like LockBit or BlackCat, who target manufacturing firms.

Advantest’s team followed established protocols, isolating systems to halt the spread.

The investigation checks for stolen data on employees or clients, with promises of direct alerts if needed.

“We are committed to transparency and will share updates as facts emerge,” the firm stated. No word yet on downtime effects, but semiconductor testing relies on these systems, risking delays in 5G, AI, and automotive chip production.

This attack underscores ransomware’s grip on tech supply chains. Japanese firms face rising hits, with incidents up 30% last year, per NISC reports.

Advantest, founded in 1954, leads in test solutions for wafers, final chips, and photomasks. Its gear supports global leaders in HPC and machine learning. A full recovery could take weeks, urging peers to audit defenses.

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