The major retailer said it is “working hard to reduce any disruption to our services” and thanked staff and customers for their patience.
A Co-op spokesman said: “We have recently experienced attempts to gain unauthorised access to some of our systems.
“As a result, we have taken proactive steps to keep our systems safe, which has resulted in a small impact to some of our back office and call centre services.
“We are not asking our members or customers to do anything differently at this point. We will continue to provide updates as necessary.”
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How will Co-op customers be affected by IT shut down?
Co-Op has said the IT system shutdown will impact its back office and call centre services.
But it has assured customers that all stores, including grocery and funeral homes, are trading as usual.
Co-op owns more than 2,000 grocery stores and 800 funeral parlours across the UK.
Are the Co-op and M&S cyber attacks linked?
This attempted Co-op hack comes as Marks & Spencer (M&S) continues to deal with the lengthy fallout of a major cyber incident.
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M&S has been unable to process online orders since last Friday (April 25), after click and collect orders and contactless payments were affected by the cyber attack.
The Metropolitan Police have since confirmed they are investigating the attack.
It is unknown at this stage whether the Co-op and M&S hacks are related.
