2024 Fujitsu — non-ransomware worm-like malware on Japan internal PCs; possible customer file exfiltration
Data compromised
Customer and personal business files potentially copied off infected workstations—categories per Fujitsu breach investigation notice
Technical writeup
Fujitsu Limited publicly traced a March 2024 discovery of advanced evasive malware on a cluster of business PCs inside its Japan corporate network, with July 2024 follow-on reporting summarizing spread to on the order of four dozen machines, deliberate file-copy behavior, and individual notifications to customers where personal or customer-project material might have left the firm's custody. Vendor statements emphasized isolation steps, no customer cloud environment impact in Fujitsu's framing, and no observed misuse of leaked data at investigation close.
Root cause
Malware infection on internal endpoints with lateral movement and exfiltration-oriented file operations (per Fujitsu and trade press)