British firms who were affected by a cyber-attack have been given an ultimatum by the criminal gang behind the hack.

In a blog post written in broken English and published on the dark web, the Clop ransomware group took ownership for the attack and told those affected by the MOVEit hack to email them before 14 June, or risk having their data published.

Employees at the affected firms have been told not to pay if hackers demand a ransom.

Zellis, the payroll provider which uses the MOVEit software, has confirmed that the BBC, British Airways, Aer Lingus and Boots have had their payroll data breached.

The stolen data includes national insurance numbers, home addresses and bank details. Over 100,000 staff at the BBC, British Airways and Boots have been told payroll data may have been taken.

The cyber-attack exploited a previously unknown weakness in the MOVEit software. Around half of FTSE 100 companies in the UK uses service provided by Zellis.

National Technology News has reached out to Zellis and companies affected by the hack for comment.

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