Hackers have struck again as a new strain of ransomware, reportedly known as Petya, is sweeping across Europe taking computer systems of major corporations, ATMs and phone systems offline.

Ukraine, Russia, France and Spain have so far been confirmed as victims of the cyberattack, which is shutting down networks in demand for $300 worth of bitcoin, bearing striking similarity to the devastating WannaCry virus that crippled the NHS in May. However, it is reported it may spread further to the UK and possibly further afar to India.

Among the victims at this early stage involve banks, pharmaceutical companies, energy and transportation companies, shipping and financial services.

According to cybersecurity experts currently analysing the ransomware's internal code, it is believed the strain (being called GoldenEye by some experts) is being supercharged with the 'Eternal Blue' leaked NSA hacking tool, which is why the virus is able to spread so quickly and aggressively.

While the WannaCry virus was stopped thanks to an industrious IT engineer finding a 'killswitch' it appears no such feature is present with Petya. However, a vaccination has been found. Unlike WannaCry, Petya is also spread via email spam in the form of boobytrapped Office documents, according to at least one expert.

Kaspersky Lab cyber expert Costin Raiu tweeted the ransomware appeared to be "spreading worldwide" with a "large number of countries affected."

Below is a full list of companies and industries that have been affected by the Petya cyberattack so far (this will continue to be updated):

How the ransomware attack unfolded on Twitter: