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Japanese automaker Honda Motor said it temporarily shut down production at a local car plant earlier this week after finding systems infected with WannaCry ransomware.

According to a report by Reuters, the company was forced to halt production on Monday at the Sayama plant, which is located northwest of Tokyo.

A Honda spokeswoman said the company first detected the virus on Sunday, affecting networks across Japan, North America, Europe, China and other regions.

Production at other facilities was not impacted, however, and regular operations at the Sayama plant resumed on Tuesday, the spokeswoman noted.

The plant is estimated to produce an estimated 1,000 vehicles per day, including the Accord, Odyssey and Step Wagon vehicle models.

“At this moment, there is no further impact confirmed, but we will continue to monitor the situation and take every step to further strengthen the security of our systems,” the company added.

Due to the size and complexity of corporate networks, it’s more challenging for large organizations to secure every asset within their environment, explains Paul Norris, senior systems engineer at Tripwire.

“Organizations will generally secure the systems they know about,” he says. “But most will have assets that are not managed or secured and are old legacy systems that haven’t been decommissioned, and remain vulnerable,” Norris told Dark Reading.

The incident comes one month after the massive WannaCry ransomware outbreak, which caused chaos for thousands of companies around the globe.

Other automakers, such as Renault SA and Nissan Motor Co, were also among the companies affected by the virus last month, stopping production at plants in Japan, Britain, France, Romania and India.