A ransomware attack rolling out across the globe has affected Australian offices of global companies.
International law firm DLA Piper has told Australian employees it has been the victim of a "major cyber incident" overnight.
Its Washington DC office was apparently affected, and Australian staff were advised via text early this morning that all IT systems had been taken down to contain the situation.
The Cadbury chocolate factory in Hobart has also been targeted, the ABC has reported.
A union official said production at Cadbury's Claremont facility was halted when the computer system went down about 9.30pm yesterday in what was described as a "cyber-attack".
It was understood cyber attackers were demanding a ransom in bitcoin currency, the ABC said.
Cadbury owner Mondelez International had said its staff in different regions were experiencing technical problems, Reuters reported.
The major global cyber-attack, dubbed GoldenEye or Petya, has disrupted servers at Russia's biggest oil company, Ukraine's international airport and the international shipping firm Maersk.
Russia and Ukraine were most affected, with other victims spread across countries including the United States, Britain, France, Germany, Italy, Poland.