This type of event in the eventlog does not tell you very much about the root cause.
The computer attempted to validate the credentials for an account.
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Error Code: 0xc0000064
The error code could also be something else, i:e
0xc000006a – The username is correct, but the password is wrong.
Usually you see more information i.e. Source Workstation or Username but not in this case.
I have seen examples origination from Microsoft Internet Authentication Server, Microsoft Network Policy Server, Bluecoat BCAAA authentication agent. All of these can produce this kind of event with no further information.