Gardaí are now liaising with Interpol and Europol over the attack on the Musgrave Group, of which SuperValu is a part.
Gardai are liaising with Interpol and Europol over the attack, which involved networks in several countries but which is believed to have originated near Belgrade.
In response to questions from Sky News, Musgrave explained that it is still assessing the extent of the hackers’ attempted extraction of customer data.
However, there is no indication that any data was successfully exported by the raiders.
Centra operate local stores in Bay Estate, Blackrock and Dromiskin while there is a Daybreak store in Louth Village.
The Garda Síochána, the Irish police force, confirmed that its cyber crime bureau is investigating the attack and an inquiry is an “an early stage”.
However, investigators are satisfied there is no North Korean link to the Musgrave Group raid.
The group said that it had detected malicious software that was attempting to extract debit and credit card numbers and expiry dates.
Musgrave, owners of the three popular stores, have advised customers to check their bank statements for any unusual transactions.
Musgrave has said that it has installed technical fixes and is actively monitoring the situation.
Musgrave says it is advising customers to review activity on their statements as a precautionary measure and has apologised for the issue.