Hackers are exploiting recently discovered vulnerabilities in Exchange email servers to drop ransomware, Microsoft has warned, a move that puts tens of thousands of email servers at risk of destructive attacks. In a tweet, the tech giant said it had detected the new kind of file-encrypting malware called DoejoCrypt — or DearCry — which uses the same four vulnerabilities that Microsoft linked to a new China-backed hacking group called Hafnium.
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