Hackers have launched a fresh ransomware attack on Europe just a month after the ‘WannaCry’ virus locked computers across the continent.

The Ukranian government appears to have been badly affected, alongside Russia’s Rosneft oil company and Danish shipping giant A.P. Moller-Maersk.

‘We are talking about a cyberattack,’ said Anders Rosendahl, a spokesman for the Copenhagen-based group said.

‘It has affected all branches of our business, at home and abroad.’

Ukrainian Deputy Prime Minister Pavlo Rozenko on Tuesday posted a picture of a darkened computer screen to Twitter, saying that the computer system at the government’s headquarters has been shut down.

There’s very little information about who might be behind the disruption, but technology experts who examined screenshots circulating on social media said it bears the hallmarks of ransomware.

Such viruses hold data to ransom, scrambling it until a payment is made, usually requesting virtual currency Bitcoin because it is anonymous and cannot be traced.

The world is still recovering from a previous outbreak of ransomware, called WannaCry or WannaCrypt, which spread rapidly using digital break-in tools originally created by the U.S. National Security Agency and recently leaked to the web.

Ukraine’s Intl Boryspil Airport in Kyiv now apparently under cyberattack. Flights maybe delayed says acting director https://t.co/VSLUtnGSeY pic.twitter.com/pHeiwLf2rt

— Christopher Miller (@ChristopherJM) June 27, 2017

BREAKING: Ukraine banks, companies & airport hit by massive hack attack, govt computers offline https://t.co/SmTf5ky8JR pic.twitter.com/jErQugPa3X

— RT (@RT_com) June 27, 2017

New Petrwrap/Petya ransomware has a fake Microsoft digital signature appended. Copied from Sysinternals Utils. pic.twitter.com/HFwA1cyoyN

— Costin Raiu (@craiu) June 27, 2017

Deputy Head of the Presidential Administration @dshymkiv instructed the team to help IT teams of other governmental institutions pic.twitter.com/iQw33ZJO7X

— The Bankova (@TheBankova) June 27, 2017

We can confirm that Maersk IT systems are down across multiple sites and business units. We are currently assessing the situation.

— Maersk (@Maersk) June 27, 2017

Just called my father. He says he couldn’t buy fuel at a petrol station, the system is shut down.
Everyone is disoriented.

— Kateryna_Kruk (@Kateryna_Kruk) June 27, 2017

“The Ukraine cabinet of ministers seems to also have been hacked. The network is down” says deputy PM. This is turning into 1 hell of a hack https://t.co/nnZrcDgOoq

— Alec Luhn (@ASLuhn) June 27, 2017