The cooperative apologized after the pirates managed to access the data of a “significant number” of past and current members.
The company said compromise data included names and contact details, but not passwords or bank details and credit card.
He said that he “continued to undergo sustained malicious attempts”.
The National Cyber Security Center (NCSC) and the National Crime Agency (NCA) helps the company to investigate.
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A spokesperson described it as a “very complex situation” and said that he had “implemented measures to ensure that we prevented unauthorized access to our systems”.
“Due to the current medico-legal surveys, we now know that the pirates have been able to access and extract data from one of our systems,” said a press release.
“Accessible data included information relating to a significant number of our current and previous members.”
He said compromised data did not include information on customer transactions or products and services that someone can have with the cooperative group.
“We appreciate that our members have placed their confidence in our cooperative when providing information,” said the spokesperson.
“Protection of data security of our members and customers is a priority, and we are sorry that this situation was born.”
Cooperation membership is an opt-in program that offers discounts and other advantages.
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It comes like Ms And the luxury retailer Harrods was also struck by cyber attacks this week.
Monday, Hundreds of M&S workers in its main distribution center They were told to stay at home when he was struggling with the attack.
Buyers have also complained of empty shelves, because M&S confirmed the “limited availability pockets in certain stores” due to measures to manage the incident.
The company also has Recruitment on break And temporarily withdrew its online recruitment pages.