Hackers went undetected in Marks and Spencer's systems for up to 52 hours before the devastating cyber attack was finally uncovered, insiders have revealed.
Believed to have been from the Scattered Spider group, the strategic attackers allegedly utilised a contractor to access the retailer's advanced IT systems.
Now, three weeks on, the crisis continues to plague the British High Street staple, with staff working for up to 24 hours a day and enduring 'sleepless nights' to fix it.
Speaking to The Times, a source said the fatal attack, which has since led to the company shedding £1billion worth of value on the stock exchange, was caused by a 'human error' that led to a 'colossal mistake'.
With hackers having worked undetected for more than two days, crisis teams battled tirelessly to protect the beloved British store, frequented by up to 9.4million active customers, throughout the five-day 'attack phase'.
