Am I doing something wrong ?

[Xanadrel]

The mask is missing in your command line, try with something like :

Code:

hashcat-cli64.exe --attack-mode 3 --output-file C:\Users\M\Desktop\h.txt.out --custom-charset1 azerty --threads 4 C:\Users\M\Desktop\hashes.txt ?1?1?1?1?1?1?1?1

For length 8 with the charset "azerty".