Joe Tidy
Cyber correspondent, BBC World Service
Getty Images
Cyber criminals person told nan BBC their hack against Co-op is acold much superior than nan institution has antecedently told nan public.
Hackers contacted nan BBC pinch impervious they had infiltrated IT networks and stolen immense amounts of customer and worker data.
After being contacted by BBC News connected Friday, a Co-op spokesperson said nan hackers "accessed information relating to a important number of our existent and past members".
Co-op had antecedently said that it had taken "proactive measures" to fend disconnected hackers and that it was only having a "small impact" connected its operations.
It besides assured nan nationalist that location was "no grounds that customer information was compromised".
The cyber criminals declare to person nan backstage accusation of 20 cardinal group wo signed up to Co-op's rank scheme, but nan patient would not corroborate that number.
The criminals, who are utilizing nan sanction DragonForce, opportunity they are besides responsible for nan ongoing onslaught connected M&S and an attempted hack of Harrods.
The anonymous hackers shared pinch nan BBC screenshots of nan first extortion connection they sent to Co-op's caput of cyber information successful an soul Microsoft Teams chat connected 25th April.
"Hello, we exfiltrated nan information from your company," nan chat says.
"We person customer database, and Co-op personnel paper data."
They besides showed screenshots of a telephone pinch nan caput of information which took spot astir a week ago.
The hackers opportunity they messaged different members of nan executive committee excessively arsenic portion of their strategy to blackmail nan firm.
Co-op has much than 2,500 supermarkets arsenic good arsenic 800 ceremonial homes and an security business.
It employs astir 70,000 unit nationwide.
The cyber onslaught was announced by nan institution connected Wednesday.
On Thursday, it was revealed Co-op unit were being urged to support their cameras connected during Teams meetings, ordered not to grounds aliases transcribe calls, and to verify that each participants were genuine Co-op staff.
The information measurement now appears to beryllium a nonstop consequence of nan hackers having entree to soul Teams chats and calls.
DragonForce shared databases pinch nan BBC that includes usernames and passwords of each employees.
They besides sent a sample of 10,000 customers information including Co-op rank paper numbers, names, location addresses, emails and telephone numbers.
The BBC has destroyed nan information it received, and is not publishing aliases sharing these documents.
DragonForce
The Co-op rank database is thought to beryllium highly valuable to nan company.
Since nan BBC contacted Co-op astir nan hackers' evidence, nan patient has disclosed nan afloat grade of nan breach to its unit and nan banal market.
"This information includes Co-op Group members' individual information specified arsenic names and interaction details, and did not see members' passwords, slope aliases in installments paper details, transactions aliases accusation relating to immoderate members' aliases customers' products aliases services pinch nan Co-op Group," a spokesperson said.
DragonForce want nan BBC to study nan hack - they are apparently trying to extort nan institution for money.
But nan criminals wouldn't opportunity what they scheme to do pinch nan information if they don't get paid.
They refused to talk astir M&S aliases Harrods and erstwhile asked astir really they consciousness astir causing truthful overmuch distress and harm to business and customers, they refused to answer.
DragonForce is simply a ransomware group known for scrambling victims' information and demanding a ransom is paid to get nan cardinal to unscramble it. They are besides known to person stolen information arsenic portion of their extortion tactics.
DragonForce operates an connection cyber crime work truthful anyone tin usage their malicious package and website to transportation retired attacks and extortions.
It's not known who is yet utilizing nan DragonForce work to onslaught nan retailers, but immoderate information experts opportunity nan strategies seen are akin to that of a loosely coordinated group of hackers who person been called Scattered Spider aliases Octo Tempest.
The pack operates connected Telegram and Discord channels and is English-speaking and young – successful immoderate cases only teenagers.
Conversations pinch nan Co-op hackers were carried retired successful matter shape - but it is clear nan hacker, who called himself a spokesperson, was a fluent English speaker.
Co-op says it is moving pinch nan NCSC and nan NCA and said successful a connection it is very sorry this business has arisen.