If the dot(s) can appear anywhere in the password and the rest is numbers, you can use a custom mask to cover all possible locations. Assuming the password is 6 long (i.e., 5 digits and 1 dot), you can generate the following mask combinations:.
.?d?d?d?d?d
?d.?d?d?d?d
?d?d.?d?d?d
?d?d?d.?d?d
?d?d?d?d.?d
?d?d?d?d?d.
In Hashcat, you can save these masks in a file (e.g. ) and then use that file for a mask attack:mask.txt
hashcat -m <hash-type> -a 3 hash.txt -m 3 mask.txt
-a 3: Mask attack mode.
mask.txt: A file that contains each mask combination.
-i: An optional parameter for increment mode, which can be added if the password length is not fixed.
<hash-type>: Your hash type number.
This method ensures that all combinations of numbers that contain a dot are covered.