Hackers target Qld premier's department

State and federal authorities are investigating a cyber attack on the Queensland government.

The email account of Annastacia Palaszczuk's director-general, David Stewart, has been hacked and used to circulate bogus emails in his name, The Courier-Mail reports.

A government spokesman told AAP on Friday morning malicious emails had been circulating and Queensland's chief information officer had called in the police.

"The Queensland government is also working with the Australian Cyber Security Centre," the spokesman said.

"Protective measures have been further strengthened within the Queensland Government to ensure the highest security protocols exist."

The spokesman would not say which parts of the government's IT system had been compromised.