A lot of IT managers currently suffer from Microsoft Exchange server vulnerabilities known as ProxyLogon/Hafnium that expose networks to malicious interference. Analysts have first seen the attack chain in early January . Microsoft has published patches and a warning in early March .
The threat from the ProxyLogon/Hafnium Exchange vulnerability evolves
While we are not in the business of protecting Exchange Servers, we are in the business of keeping files safe. In mid-March, Microsoft reported that the ProxyLogon/Hafnium vulnerabilities were now exploited for ransomware attacks.
We have detected and are now blocking a new family of ransomware being used after an initial compromise of unpatched on-premises Exchange Servers. Microsoft protects against this threat known as Ransom:Win32/DoejoCrypt.A, and also as DearCry.
— Microsoft Security Intelligence (@MsftSecIntel) March 12, 2021
Once a network is breached using the ProxyLogon/Hafnium attack chain, intruders can leave backdoors, delete back-ups, install crypto miners and encrypt files.
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