Micro-Star International Company Ltd (MSI) suffered a data breach after a ransomware gang claimed it stole files from the PC maker, PCmag reports.

The company published a Taiwanese stock exchange filing(Opens in a new window) about experiencing a “cyber attack,” although the company is thin on details.

The ransomware group is reportedly demanding $4 million or it will leak the stolen data, which includes company source code.

“After detecting some information systems being attacked by hackers, MSI’s IT department has initiated information security defense mechanism and recovery procedures,” the PC maker said. The company also reported the incident to authorities.

A new statement(Opens in a new window) from MSI says users should avoid downloading firmware and BIOS updates from third-party sources, and instead only obtain such software from the company’s official website.

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