Common password pattern generator using strings list.
Quick Installation:

$ git clone https://github.com/localh0t/m4ngl3m3
 $ cd m4ngl3m3
 $ ./main.py

Basic Help:

usage: main.py [-h] [-fy FROM_YEAR] [-ty TO_YEAR] [-sy] [-nf NUMBERS_FILE]
                [-sf SYMBOLS_FILE] [-cf CUSTOM_FILE] [-sbs] [-sap]
                [-mm MUTATION_METHODS]
                MUTATION_MODE STRINGS_FILE OUTPUT_FILE
 
 Common password pattern generator using strings list
 
 positional arguments:
   MUTATION_MODE         Mutation mode to perform: (prefix-mode | 
                         suffix-mode | dual-mode)
   STRINGS_FILE          File with strings to mutate
   OUTPUT_FILE           Where to write the mutated strings
 
 optional arguments:
   -h, --help            show this help message and exit
   -fy FROM_YEAR, --from-year FROM_YEAR
                         Year where our iteration starts (default: 
                         2015)
   -ty TO_YEAR, --to-year TO_YEAR
                         Year where our iteration ends (default: 
                         2020)
   -sy, --short-year     Also add shorter year form when iterating 
                         (default: False)
   -nf NUMBERS_FILE, --numbers-file NUMBERS_FILE
                         Numbers prefix/suffix file (default:
                         ./files/numbers/numbers_set2.txt)
   -sf SYMBOLS_FILE, --symbols-file SYMBOLS_FILE
                         Symbols prefix/suffix file (default:
                         ./files/symbols/symbols_set2.txt)
   -cf CUSTOM_FILE, --custom-file CUSTOM_FILE
                         Custom words/dates/initials/etc file 
                         (default: None)
   -sbs, --symbols-before-suffix
                         Insert symbols also before years/numbers/
                         custom (when in suffix-mode or dual-mode)
                         (default: False)
   -sap, --symbols-after-prefix
                         Insert symbols also after years/numbers/
                         custom (when in prefix-mode or dual-mode) 
                         (default: False)
   -mm MUTATION_METHODS, --mutation-methods MUTATION_METHODS
                         Mutation methods to perform (comma
                         separated, no spaces) (valid: see
                         MUTATION_METHODS.md)                  
                         (default:
                         normal,uppercase,firstup,replacevowels)

--from-year (-fy), --to-year (-ty):
Here we set where we want our script to start and end iterating over years. Many times people include the current year in an effort to add some entropy. Because passwords could be outdated, or the years included could be in the (near) future, we are going to add them as a range. For online environments, we would be looking at a conservative approach and only include ranges in the order of (-1, +1) or (-2, +2). For offline environments, the range could be wider to (-20, +5) or even (-50, +10). Output example:

password2017
 [...]
 password2018
 [...]
 password2019

--short-year (-sy):
When iterating years, also add its shorter double digit form. Output example:

password17
 [...]
 password18
 [...]
 password19

--numbers-file (-nf):
In this argument we are going to select a file containing numbers that people frequently add to their passwords. By default I included 6 sets, the largest being the 6, and the rest being subsets of the previous one. The numbers included in the first sets (1,2…) are more likely to be present that the ones only included in latest sets (…5,6). Again, for online environments, we would be looking at using the first three sets, where in offline environments, we could use the last ones. By default, the script uses the set number 2. Output example:

password1
 [...]
 password123
 [...]
 password1234

--symbols-file (-sf):
In this argument we are going to select a file containing symbols that people frequently add to their passwords. Again, set number 1 is the shortest, set number 6 is the largest. The symbols included in the first sets (1,2…) are more likely to be present that the ones only included in latest sets (…5,6). By default, the script uses the set number 2. Output example:

password123!
 [...]
 password2018?
 [...]
 password1234.

--custom-file (-cf):
Here we add anything else we know about our targets (and it’s not considered as the “base” of the password itself). Let the creativity roll in! It could be from company initials, birth dates, special dates… to specific years, short keywords, etc. This custom strings will be treated in the same way that the years/numbers. Output example:

passwordABC
 [...]
 password01011980!
 [...]
 password.admin

MUTATION_MODE (positional argument):
In this parameter we are going to select how the tool will work when shifting strings. You can choose one of three:

• suffix-mode: It will add years, numbers, symbols and custom after the main string. Example: password2018!
• prefix-mode: It will add years, numbers, symbols and custom before the main string. Example: !2018password
• dual-mode: As the name suggests, it uses both modes (generates both outputs).

STRINGS_FILE (positional argument):
File containing strings to mutate. If you’re for example, doing a pentest and don’t know where to start, I would suggest you using a tool like CeWL to spider the company website, and keep the most recurring words (including the company name of course).

OUTPUT_FILE (positional argument):
Simply, file where we want to write the mutated strings.

--symbols-before-suffix (-sbs):
When this flag is enabled, and we are running the tool either in suffix-mode or dual-mode, the script will also add the symbols before years/numbers/custom. Output example:

password2018!
 [...]
 password!2018
 [...]

--symbols-after-prefix (-sap):
When this flag is enabled, and we are running the tool either in prefix-mode or dual-mode, the script will also add the symbols after years/numbers/custom. Output example:

!2018password
 [...]
 2018!password
 [...]

--mutation-methods (-mm):
In this parameter we define which mutation methods are going to be performed. Mutation methods are base transformations made before starting iterating over years/numbers/symbols/custom. You can select as many mutation methods as you want. For a list of all valid mutation methods, check: MUTATION_METHODS.md.
By default, m4ngl3m3! runs with the following: Normal, UpperCase, FirstUp and ReplaceVowels.

Usage examples:

Usage example (1):

$ ./main.py --from-year 2017 --to-year 2018 --symbols-before-suffix suffix-mode strings.txt output.txt
 (or, shorter version)
 $ ./main.py -fy 2017 -ty 2018 -sbs suffix-mode strings.txt output.txt
 [!] Starting...
 [+] Normal-Mangling mutation method done on string: admin
 [+] UpperCase-Mangling mutation method done on string: admin
 [+] FirstUp-Mangling mutation method done on string: admin
 [+] ReplaceVowels-Mangling mutation method done on string: admin
 ---
 [+] Normal-Mangling mutation method done on string: companyname
 [+] UpperCase-Mangling mutation method done on string: companyname
 [+] FirstUp-Mangling mutation method done on string: companyname
 [+] ReplaceVowels-Mangling mutation method done on string: companyname
 ---
 [!] All done!
 [!] Strings read: 2
 [!] Strings written: 888
 [!] Exiting ...
 

“Iterate from year 2017 to 2018, default numbers and symbols file, suffix mode only, insert symbols also before suffix, default mutation methods.”

Input file:

admin
 companyname
 

Output file:

admin
 admin!
 [...]
 Admin2017!
 Admin!2017
 [...]
 COMPANYNAME1234!
 COMPANYNAME!1234
 [...]
 [email protected]
 [email protected]
 [...]

Usage example (2):

$ ./main.py -fy 2016 -ty 2019 -sy -nf ./files/numbers/numbers_set1.txt -sf ./files/symbols/symbols_set1.txt -sbs -sap -mm normal,firstup,doubleandfirstup,basicleet dual-mode strings.txt output.txt
 [!] Starting...
 [+] Normal-Mangling mutation method done on string: password
 [+] FirstUp-Mangling mutation method done on string: password
 [+] DoubleAndFirstUp-Mangling mutation method done on string: password
 [+] BasicLeet-Mangling mutation method done on string: password
 ---
 [+] Normal-Mangling mutation method done on string: example
 [+] FirstUp-Mangling mutation method done on string: example
 [+] DoubleAndFirstUp-Mangling mutation method done on string: example
 [+] BasicLeet-Mangling mutation method done on string: example
 ---
 [!] All done!
 [!] Strings read: 2
 [!] Strings written: 1288
 [!] Exiting ...
 

“Iterate from year 2016 to 2019, with short year form also, use set 1 for numbers and symbols, dual-mode (prefix and suffix), insert symbols also before suffix, insert symbols also after prefix, mutation methods: Normal, FirstUp, DoubleAndFirstUp, BasicLeet.”

Input file:

password
 example

Output file:

password
 password!
 [email protected]
 [...]
 !2018PasswordPassword
 !18PasswordPassword
 2018!PasswordPassword
 18!PasswordPassword
 [...]
 p455w0rd$1
 p455w0rd123
 p455w0rd123!
 p455w0rd!123
 [...]
 Example!2019
 Example!19
 [...]