Lloyds Banking Group experienced a 48-hour distributed denial of service (DDoS) attack this month as cyber criminals attempted to block access to millions of accounts, demanding a large ransom to end the onslaught.
The DDoS ran from Wednesday 11 January to Friday 13 January and affected Lloyds, Halifax and Bank of Scotland as attackers flooded the sites with millions of requests in order to force them offline.
However, no accounts were successfully hacked and Lloyds did not pay a ransom, which the attackers had demanded be paid in bitcoins.
In a statement Lloyds said: “We experienced intermittent service issues with internet banking between Wednesday morning and Friday afternoon the week before last and are sorry for any inconvenience caused.
“We had a normal service in place for the vast majority of this period and only a small number of customers experienced problems. In most cases if customers attempted another log-in they were able to access their accounts.
“We will not speculate on the cause of these intermittent issues.”