Hascat rules can modify wordlists

hashcat --force password.list -r custom.rule --stdout | sort -u > mut_password.list

Or use an existing rule

Rules format:

Function	Description
`:`	Do nothing
`l`	Lowercase all letters
`u`	Uppercase all letters
`c`	Capitalize the first letter and lowercase others
`sXY`	Replace all instances of X with Y
`$!`	Add the exclamation character at the end

Using CeWL

cewl <https://www.inlanefreight.com> -d 4 -m 6 --lowercase -w inlane.wordlist

Writeup

What is Mark's password?

The password hash is: 97268a8ae45ac7d15c3cea4ce6ea550b

He was born on August 5, 1998
He works at Nexura, Ltd.
- The company's password policy requires passwords to be at least 12 characters long, to contain at least one uppercase letter, at least one lowercase letter, at least one symbol and at least one number
He lives in San Francisco, CA, USA
He has a pet cat named Bella