Aluminium firm cyber-attack cost at least £25.6m Published duration 27 March 2019

image copyright Getty Images image caption Employees were told not to connect to the company network by notices on the doors of Hydro's offices

A cyber-attack on a Norwegian aluminium company has cost it at least 300 million Norwegian kroner (£25.6m).

The company said it was slowly bringing affected systems back online but the "preliminary" cost of the incident had been about 300-350 million kroner.

Most of those losses had been in its Extruded Solutions division, which makes aluminium facades, Hydro said.

Business impact

Overall production in this division was down 20-30% and one of its business units, which makes doors and windows, was "at a standstill".

And machines normally automatically controlled by computers were being operated manually at some factories.

However, the company has won praise from cyber-security experts for its transparency.

Kevin Beaumont said in a detailed blog about the cyber-attack that Hydro had shown off "the best incident representation response plan I've ever seen".

And Dale Paterson, who advises commercial companies on cyber-security issues, praised Hydro's latest update as "tremendous" for detailing the business impact of the attack.

Related Topics Cyber-security

Norway