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Co-op fends off hackers as police probe M&S cyber attack
The retailer says it's disabled parts of its IT systems in response to the incident.
Ransomware is malicious software which locks an owner out of their computer or network and scrambles their data - with the criminals demanding a fee to unlock it. It is not known whether the Co-op discovered the hacking attempt as a result of any extra security checks following the cyber attack on its high street rival. Daniel Card, cyber expert at BCS, the chartered institute for IT, said it was "very rare" for a firm to take systems offline after an attempted hack.
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