Mackay Sugar, a major Australian sugar producer, has been targeted in a ransomware attack that forced it to shut down some of its mills.

The hacker attack came to light on June 10, when Mackay Sugar announced it was responding to a cybersecurity incident affecting some of its operations.

“Interim processes are in place to support critical business functions and minimise disruption where possible,” the company said at the time.

Mackay Sugar operates three cane-processing mills in Queensland and is Australia’s second-largest raw sugar producer.

The cyberattack appears to have impacted operations at two of the mills, but the company announced on June 12 that it had “recommenced a limited manual crushing operation” at one mill to process cane harvested prior to the incident.