4/7/2024 0 Comments Vmware esxi 6.7 vs 6.5This blog post won't go into the technical details on how the attacker gets into the ESXi hosts to execute the actual ransomware. This can greatly increase the scope and speed of the attack, which is bad news for us. The benefit of this method from the attackers' side is that they can encrypt numerous systems without having to reach them all over the network and obtain administrative privileges. We have recently seen an increase in ransomware attacks where the encryption is executed from the virtualization platform (ESXi or Hyper-V hosts) rather than from inside each guest operating systems (Windows, Linux etc). We can fairly easily prevent this by combining the use of TPM 2.0, UEFI Secure Boot for the ESXi hosts and the relatively unknown ESXi setting, which is described in the 'Three steps to protect ESXi against ransomware' section below.This attack vector is possible because once attackers get control of an ESXi host, they can upload and execute any custom binaries they want.More info can be found in this Crowdstrike writeup. We have recently seen an increase in ransomware targeting VMware vSphere ESXi hosts and encrypting all virtual machines at once, quickly and effectively.Using TPM 2.0, Secure Boot and execInstalledOnly
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