?a means all possible "standard chars" a-zA-Z0-9 and special chars like *# (see help)
well you can choose i think up to 12 times ?a before you ran into a buffer overflow, if you dont remember anything choose option --increment to tell hashcat to start at postition one with this mask and try upwards one, two three and so on positions ?a -> ?a?a -> ?a?a?a ...
well you can choose i think up to 12 times ?a before you ran into a buffer overflow, if you dont remember anything choose option --increment to tell hashcat to start at postition one with this mask and try upwards one, two three and so on positions ?a -> ?a?a -> ?a?a?a ...