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".
