The UK's National Health Service (NHS) is investigating claims of a cyberattack by extortion crew Clop.

The cybercriminal gang, which in recent months has targeted organizations using an Oracle E-Business Suite (EBS) exploit, added the NHS to its leak site on November 11, but has yet to publish any data.

Clop simply lists the NHS.uk domain, but does not specify which of the myriad branches of the UK's healthcare system it breached.

The NHS comprises hundreds of organizations at national, regional, and local levels, so Clop's failure to specify which arm or trust it compromised raises questions about how much it knows of the attack.

It also listed the NHS's revenue as $234 billion, which appears to be a crude calculation taken from the Department of Health and Social Care's budget.

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