The gang thought to have carried out a cyber assault on corporations together with BA and Boots has given victims a deadline to barter or have the hacked info revealed on-line.
The suspected Russian group Clop, which claimed duty for the assault, issued the discover on the darkish internet to victims of the MOVEit software hack.
Personal knowledge of greater than 100,000 workers was accessed within the assault, together with financial institution and phone particulars.
In a darkish internet weblog put up, Clop instructed victims to e-mail and negotiate with the group by 14 June, the BBC reported.
The BBC itself was impacted by the assault, as was airline Aer Lingus.
More victims have emerged, together with the University of Rochester in New York. The authorities of Nova Scotia in Canada additionally mentioned it was subjected to the assault.
Clop has reportedly claimed it has deleted any knowledge from authorities, metropolis or police providers, saying: "Do not worry, we erased your data you do not need to contact us. We have no interest to expose such information."
Payroll software program firm Zellis - which used the MOVEit software program that resulted in BA, BBC and Aer Lingus workers having their knowledge accessed - mentioned eight of its clients have been hit however didn't title them.
Other Zellis clients embody Jaguar Land Rover, Harrods and Dyson.
Potentially a whole bunch of corporations utilizing the favored MOVEit enterprise software program could also be impacted.
Read extra:Origins of cyber attack 'appear to have Russian links' - analysis
A weak hyperlink in MOVEit code - a so-called zero day vulnerability - enabled hackers to entry its servers and the non-public and monetary knowledge of workers.
The group's motivations are unclear to date. It claimed duty in an e-mail to Reuters news company on Monday.
A MOVEit spokesperson mentioned: "Our customers have been, and will always be, our top priority. When we discovered the vulnerability, we promptly launched an investigation, alerted MOVEit customers about the issue and provided immediate mitigation steps."
They added: "We are continuing to work with industry-leading cybersecurity experts to investigate the issue and ensure we take all appropriate response measures. We have engaged with federal law enforcement and other agencies with respect to the vulnerability."
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