John

John (aka John the Ripper) is a fast password cracker, currently available for many flavors of Unix, macOS, Windows, DOS, BeOS, and OpenVMS

Link: https://github.com/magnumripper/JohnTheRipper

Simple usage

JTR password cracking

john --wordlist=/usr/share/wordlists/rockyou.txt hashes

JTR forced descrypt cracking with wordlist

john --format=descrypt --wordlist /usr/share/wordlists/rockyou.txt hash.txt

JTR forced descrypt brute force cracking

john --format=descrypt hash --show

Display formats:

john --list=formats

Type and mask:

iron@kali2:/tmp$ sudo john lm.txt --mask=?l?l?l?l --format=lm

mask

Create a mask:

example: 

root@attackdefense:~# john pdfhash --mask=?d?d?d?d?d?d?d?d?l 
?d = digit 
?l = lower-case ASCII letters 
?u = upper-case ASCII letters

example with numbers in the middle: 

root@attackdefense:~# john pdfhash --mask=?d?d?d?d19?d?d?u 
Using default input encoding: UTF-8 
Loaded 1 password hash (PDF [MD5 SHA2 RC4/AES 32/64]) 
Press 'q' or Ctrl-C to abort, almost any other key for status 
01021980D        (/root/encrypted.pdf) 
1g 0:00:00:05 DONE (2019-10-31 10:10) 0.1721g/s 530466p/s 530466c/s 530466C/s 01021980D 
Use the "--show" option to display all of the cracked passwords reliably 
Session completed

A mask may consist of: 

- Static letters. 
- Ranges in [aouei] or [a-z] syntax. Or both, [0-9abcdef] is the same as 
     [0-9a-f]. 
- Placeholders that are just a short form for ranges, like ?l which is 
     100% equivalent to [a-z]. 
- ?l lower-case ASCII letters 
- ?u upper-case ASCII letters 
- ?d digits 
- ?s specials (all printable ASCII characters not in ?l, ?u or ?d) 
- ?a full 'printable' ASCII. Note that for formats that don't recognize case 
     (eg. LM), this only includes lower-case characters which is a tremendous 
     reduction of keyspace for the win. 
- ?B all 8-bit (0x80-0xff) 
- ?b all (0x01-0xff) (the NULL character is currently not supported by core). 
- ?h lower-case HEX digits (0-9, a-f) 
- ?H upper-case HEX digits (0-9, A-F) 
- ?L lower-case non-ASCII letters 
- ?U upper-case non-ASCII letters 
- ?D non-ASCII "digits" 
- ?S non-ASCII "specials" 
- ?A all valid characters in the current code page (including ASCII). Note 
     that for formats that don't recognize case (eg. LM), this only includes 
     lower-case characters which is a tremendous reduction of keyspace. 
- Placeholders that are custom defined, so we can e.g. define ?1 to mean [?u?l] 
  ?1 .. ?9 user-defined place-holder 1 .. 9 
 Placeholders for Hybrid Mask mode: 
  ?w is a placeholder for the original word produced by the parent mode in 
     Hybrid Mask mode. 
  ?W is just like ?w except the original word is case toggled (so PassWord 
     becomes pASSwORD).

Windows

C:\Users\David\Documents\Tools\john-1.9.0-jumbo-1-win64\run>john.exe ..\test.txt --format=raw-MD5

Formats

Common formats:

All Formats: 

descrypt, bsdicrypt, md5crypt, md5crypt-long, bcrypt, scrypt, LM, AFS,  
tripcode, AndroidBackup, adxcrypt, agilekeychain, aix-ssha1, aix-ssha256,  
aix-ssha512, andOTP, ansible, argon2, as400-des, as400-ssha1, asa-md5,  
AxCrypt, AzureAD, BestCrypt, bfegg, Bitcoin, BitLocker, bitshares, Bitwarden,  
BKS, Blackberry-ES10, WoWSRP, Blockchain, chap, Clipperz, cloudkeychain,  
dynamic_n, cq, CRC32, sha1crypt, sha256crypt, sha512crypt, Citrix_NS10,  
dahua, dashlane, diskcryptor, Django, django-scrypt, dmd5, dmg, dominosec,  
dominosec8, DPAPImk, dragonfly3-32, dragonfly3-64, dragonfly4-32,  
dragonfly4-64, Drupal7, eCryptfs, eigrp, electrum, EncFS, enpass, EPI,  
EPiServer, ethereum, fde, Fortigate256, Fortigate, FormSpring, FVDE, geli,  
gost, gpg, HAVAL-128-4, HAVAL-256-3, hdaa, hMailServer, hsrp, IKE, ipb2,  
itunes-backup, iwork, KeePass, keychain, keyring, keystore, known_hosts,  
krb4, krb5, krb5asrep, krb5pa-sha1, krb5tgs, krb5-17, krb5-18, krb5-3,  
kwallet, lp, lpcli, leet, lotus5, lotus85, LUKS, MD2, mdc2, MediaWiki,  
monero, money, MongoDB, scram, Mozilla, mscash, mscash2, MSCHAPv2,  
mschapv2-naive, krb5pa-md5, mssql, mssql05, mssql12, multibit, mysqlna,  
mysql-sha1, mysql, net-ah, nethalflm, netlm, netlmv2, net-md5, netntlmv2,  
netntlm, netntlm-naive, net-sha1, nk, notes, md5ns, nsec3, NT, o10glogon,  
o3logon, o5logon, ODF, Office, oldoffice, OpenBSD-SoftRAID, openssl-enc,  
oracle, oracle11, Oracle12C, osc, ospf, Padlock, Palshop, Panama,  
PBKDF2-HMAC-MD4, PBKDF2-HMAC-MD5, PBKDF2-HMAC-SHA1, PBKDF2-HMAC-SHA256,  
PBKDF2-HMAC-SHA512, PDF, PEM, pfx, pgpdisk, pgpsda, pgpwde, phpass, PHPS,  
PHPS2, pix-md5, PKZIP, po, postgres, PST, PuTTY, pwsafe, qnx, RACF,  
RACF-KDFAES, radius, RAdmin, RAKP, rar, RAR5, Raw-SHA512, Raw-Blake2,  
Raw-Keccak, Raw-Keccak-256, Raw-MD4, Raw-MD5, Raw-MD5u, Raw-SHA1,  
Raw-SHA1-AxCrypt, Raw-SHA1-Linkedin, Raw-SHA224, Raw-SHA256, Raw-SHA3,  
Raw-SHA384, ripemd-128, ripemd-160, rsvp, Siemens-S7, Salted-SHA1, SSHA512,  
sapb, sapg, saph, sappse, securezip, 7z, Signal, SIP, skein-256, skein-512,  
skey, SL3, Snefru-128, Snefru-256, LastPass, SNMP, solarwinds, SSH, sspr,  
Stribog-256, Stribog-512, STRIP, SunMD5, SybaseASE, Sybase-PROP, tacacs-plus,  
tcp-md5, telegram, tezos, Tiger, tc_aes_xts, tc_ripemd160, tc_ripemd160boot,  
tc_sha512, tc_whirlpool, vdi, OpenVMS, vmx, VNC, vtp, wbb3, whirlpool,  
whirlpool0, whirlpool1, wpapsk, wpapsk-pmk, xmpp-scram, xsha, xsha512, ZIP,  
ZipMonster, plaintext, has-160, HMAC-MD5, HMAC-SHA1, HMAC-SHA224,  
HMAC-SHA256, HMAC-SHA384, HMAC-SHA512, dummy, crypt

Cracking examples

Cracking /etc/shadow

sudo /usr/sbin/unshadow /etc/passwd /etc/shadow > /tmp/crack.password.db 
john /tmp/crack.password.db 
Loaded 2 password hashes with 2 different salts (sha512crypt, crypt(3) $6$ [SHA512 256/256 AVX2 4x])

Cracking pdf protected password

pdf2john encrypted.pdf >> hash 
john hash --mask=?d?d?d?d?d?d?d?d?l 
pdftotext -upw PASSWORD encrypted.pdf

Cracking ssh key

root@attackdefense:~# ssh2john id_rsa >> hash 
root@attackdefense:~# cat hash 
id_rsa:$ssh2$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*1766*0

MD5 wordlist

root@attackdefense:~# for x in $(cat wordlists/100-common-passwords.txt); do echo -n $x | md5sum >> wordlist.txt; done 
root@attackdefense:~# cat wordlist.txt | cut -d' ' -f1 >> new 
root@attackdefense:~# john hash --wordlist=new

John cheat sheet

https://countuponsecurity.files.wordpress.com/2016/09/jtr-cheat-sheet.pdf

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