British advertising agency WPP is among dozens of firms reporting problems.
Some experts are suggesting that it could be a ransomware attack, similar to Wannacry which hit last month.
Alan Woodward, a computer scientist at Surrey University, said:
"It appears to be a variant of a piece of ransomware that emerged last year. It was updated earlier in 2017 by the criminals when certain aspects were defeated. The ransomware was called Petya and the updated version Petrwap."
A Swiss government agency has also reported that it has seen signs of Petya circulating again.
Reports state that this attack is beginning to spread worldwide. Please take all necessary security precautions, ensure your anti-virus is up to date and warn colleagues not to open any suspicious files or click on any links within emails.
IF YOU REQUIRE ASSISTANCE OR HAVE ANY SECURITY CONCERNS, PLEASE CONTACT US ON 03456 200 200 and ask for our Security Team.
Many reports suggest that screens around the world are getting this message, indicating a ransomware attack is to blame. Firms around the globe are reporting that they have been hit by a major cyber-attack. British advertising agency WPP is among dozens of firms reporting problems. Ukrainian firms, including the state power distributor and Kiev's main airport were among the first to report issues. Some experts have suggested that it could be a ransomware attack, similar to Wannacry which hit last month. Alan Woodward, a computer scientist at Surrey University, said: "It appears to be a variant of a piece of ransomware that emerged last year.
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