Windows 10 Host - Hardening error - VMs do not start

[Jacob Klein]

Windows 10 Host - Hardening error - VMs do not start

Steps (on latest Windows Release build - Windows 10 x64 Version 1809 Build 17763.195):

• Install and use VirtualBox v6.0.0
• Start with a Linux VM that has a restored snapshot from v5.2.23 (mine was from VirtualBox v5.2.23 Test Build 127495)
• Start the VM - it starts successfully
• Take an online snapshot
• While the VM is running, delete the old v5.2.23 snapshot
• Power off the VM
• Restore the online snapshot
• Attempt to Start the VM

- BUG: Progress gets to 97% and hangs. It does not start. Later, a secondary progress dialog appears on the VM Manager window, and also hangs.

• NOTE: The following lines in VBoxHardening.log may indicate a problem with "wintab32.dll":

2658.2dec: supR3HardenedMonitor_LdrLoadDll: error opening 'C:\WINDOWS\system32\wintab32.dll': 0 (NtPath=\??\C:\WINDOWS\system32\wintab32.dll; Input=C:\WINDOWS\system32\wintab32.dll; rcNtGetDll=0x0 2658.2dec: supR3HardenedMonitor_LdrLoadDll: returns rcNt=0xc0000034 'C:\WINDOWS\system32\wintab32.dll'

Attached are:

• .vbox files (multiple versions), showing the progression of the steps
• .log files (VBox.log, VBoxHardening.log)
• Image showing failure

This worked properly using VirtualBox v5.2.23 Test Build 127495.

Let me know if you require the actual VM itself.