Embraer on late Monday said its IT systems suffered a cyberattack, resulting in the disclosure of data allegedly attributed to the company in the early hours of November 30. The company said it identified the attack on November 25 and noted it made access to a “single environment” of the company’s computer files unavailable.

Embraer immediately began an investigation and had to isolate some of its systems to protect the overall computer network, causing a temporary effect on some of its operations, the company reported in a statement. It added that it continues to operate using so-called contingency systems and with no “material impact” on its activities.

“The company is using all its efforts to fully normalize its operations, investigate the circumstances of the attack, determine whether there is any impact on its business and third parties, and define the measures to be taken,” said Embraer. “The company will keep the market informed of subsequent developments arising from this event.”