6.43M accounts from Qakbot were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In August 2023, the US Justice Department announced a multinational operation involving actions in the United States, France, Germany, the Netherlands, and the United Kingdom to disrupt the botnet and malware known as Qakbot and take down its infrastructure. After the takedown, 6.43M email addresses were provided to HIBP to help notify victims of the malware.
Source: Have I Been Pwned (CC BY 4.0)