UMFD-0 user

Question

I have a user C:\Users\UMFD-0 is this normal ? What is this user ? Who is this ?

Answer 1

AFAIK, UMFD-0 is a legitimate system account created by Windows for the User Mode Font Driver Host, fontdrvhost.exe. Its purpose is to sandbox font parsing so that malicious or malformed fonts cannot compromise the kernel or other critical parts of the system. The account runs with minimal privileges and is isolated from your main user accounts.

These accounts, such as UMFD-0 or UMFD-1, appear in C:\Users only because Windows assigns a profile folder when the sandboxed process temporarily needs one. Normally, these folders are small and contain minimal data related to font rendering. They are not user accounts in the conventional sense, and they cannot be used to log in interactively.

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hth

Marcin