Mimikatz works by accessing the Local Security Authority Subsystem Service (LSASS) memory. You can enable LSA Protection to prevent untrusted processes from reading this memory.
The string mimounidllx64v5200password12345zip is a classic naming convention for archived offensive security tools. Here is what each component typically stands for: mimounidllx64v5200password12345zip
Whenever possible, download the raw source code and compile the executable yourself. This ensures that no third party has injected malicious code into the binary. Mimikatz works by accessing the Local Security Authority