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Get-SyscallDelegate.ps1
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function Get-SyscallDelegate {
<#
.SYNOPSIS
Allocate 32/64 bit shellcode and get a Syscall delegate for the memory pointer.
.DESCRIPTION
Author: Ruben Boonen (@FuzzySec)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.PARAMETER ReturnType
Syscall return type, this should be an NTSTATUS code (UInt32).
.PARAMETER ParameterArray
An array of parameter types which the Syscall expects.
.EXAMPLE
# Sample definition for NtWriteVirtualMemory
C:\PS> $NtWriteVirtualMemory = Get-SyscallDelegate -ReturnType '[UInt32]' -ParameterArray @([IntPtr],[IntPtr],[IntPtr],[int],[ref][int])
# Syscall ID = 0x37 (Win7)
C:\PS> $NtWriteVirtualMemory.Invoke([UInt16]0x37,[IntPtr]$hProcess,[IntPtr]$pBaseAddress,[IntPtr]$pBuffer,$NumberOfBytesToWrite,[ref]$OutBytes)
#>
param(
[Parameter(Mandatory=$True)]
[ValidateSet(
'[Byte]',
'[UInt16]',
'[UInt32]',
'[UInt64]',
'[IntPtr]',
'[String]')
]
$ReturnType,
[Parameter(Mandatory=$True)]
[AllowEmptyCollection()]
[Object[]]$ParameterArray
)
Add-Type -TypeDefinition @"
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security.Principal;
public class Syscall
{
[DllImport("kernel32.dll", SetLastError = true)]
public static extern IntPtr VirtualAlloc(
IntPtr lpAddress,
uint dwSize,
UInt32 flAllocationType,
UInt32 flProtect);
[DllImport("kernel32.dll", SetLastError=true)]
public static extern bool VirtualFree(
IntPtr lpAddress,
uint dwSize,
uint dwFreeType);
}
"@
#-----------------------------
# -= Arch x86 =-
# ASM Source => https://github.com/mwrlabs/KernelFuzzer/blob/master/bughunt_syscall.asm
# Compiled with Get-KeystoneAssembly => https://github.com/keystone-engine/keystone/tree/master/bindings/powershell
#-----------------------------
$x86SyscallStub = [Byte[]] @(
0x55, # push ebp
0x89, 0xE5, # mov ebp, esp
0x81, 0xEC, 0x84, 0x00, 0x00, 0x00, # sub esp, 84h
0x8B, 0x8D, 0x88, 0x00, 0x00, 0x00, # mov ecx, [ebp + 88h]
0x51, # push ecx
0x8B, 0x8D, 0x84, 0x00, 0x00, 0x00, # mov ecx, [ebp + 84h]
0x51, # push ecx
0x8B, 0x8D, 0x80, 0x00, 0x00, 0x00, # mov ecx, [ebp + 80h]
0x51, # push ecx
0x8B, 0x4D, 0x7C, # mov ecx, [ebp + 7Ch]
0x51, # push ecx
0x8B, 0x4D, 0x78, # mov ecx, [ebp + 78h]
0x51, # push ecx
0x8B, 0x4D, 0x74, # mov ecx, [ebp + 74h]
0x51, # push ecx
0x8B, 0x4D, 0x70, # mov ecx, [ebp + 70h]
0x51, # push ecx
0x8B, 0x4D, 0x6C, # mov ecx, [ebp + 6Ch]
0x51, # push ecx
0x8B, 0x4D, 0x68, # mov ecx, [ebp + 68h]
0x51, # push ecx
0x8B, 0x4D, 0x64, # mov ecx, [ebp + 64h]
0x51, # push ecx
0x8B, 0x4D, 0x60, # mov ecx, [ebp + 60h]
0x51, # push ecx
0x8B, 0x4D, 0x5C, # mov ecx, [ebp + 5Ch]
0x51, # push ecx
0x8B, 0x4D, 0x58, # mov ecx, [ebp + 58h]
0x51, # push ecx
0x8B, 0x4D, 0x54, # mov ecx, [ebp + 54h]
0x51, # push ecx
0x8B, 0x4D, 0x50, # mov ecx, [ebp + 50h]
0x51, # push ecx
0x8B, 0x4D, 0x4C, # mov ecx, [ebp + 4Ch]
0x51, # push ecx
0x8B, 0x4D, 0x48, # mov ecx, [ebp + 48h]
0x51, # push ecx
0x8B, 0x4D, 0x44, # mov ecx, [ebp + 44h]
0x51, # push ecx
0x8B, 0x4D, 0x40, # mov ecx, [ebp + 40h]
0x51, # push ecx
0x8B, 0x4D, 0x3C, # mov ecx, [ebp + 3Ch]
0x51, # push ecx
0x8B, 0x4D, 0x38, # mov ecx, [ebp + 38h]
0x51, # push ecx
0x8B, 0x4D, 0x34, # mov ecx, [ebp + 34h]
0x51, # push ecx
0x8B, 0x4D, 0x30, # mov ecx, [ebp + 30h]
0x51, # push ecx
0x8B, 0x4D, 0x2C, # mov ecx, [ebp + 2Ch]
0x51, # push ecx
0x8B, 0x4D, 0x28, # mov ecx, [ebp + 28h]
0x51, # push ecx
0x8B, 0x4D, 0x24, # mov ecx, [ebp + 24h]
0x51, # push ecx
0x8B, 0x4D, 0x20, # mov ecx, [ebp + 20h]
0x51, # push ecx
0x8B, 0x4D, 0x1C, # mov ecx, [ebp + 1Ch]
0x51, # push ecx
0x8B, 0x4D, 0x18, # mov ecx, [ebp + 18h]
0x51, # push ecx
0x8B, 0x4D, 0x14, # mov ecx, [ebp + 14h]
0x51, # push ecx
0x8B, 0x4D, 0x10, # mov ecx, [ebp + 10h]
0x51, # push ecx
0x8B, 0x4D, 0x0C, # mov ecx, [ebp + 0Ch]
0x51, # push ecx
0x8B, 0x45, 0x08, # mov eax, [ebp + 08h]
0xBA, 0x00, 0x03, 0xFE, 0x7F, # mov edx, 7FFE0300h
0xFF, 0x12, # call dword ptr [edx]
0x89, 0xEC, # mov esp, ebp
0x5D, # pop ebp
0xC3) # ret
#-----------------------------
# -= Arch x64 =-
# ASM Source => https://github.com/mwrlabs/KernelFuzzer/blob/master/bughunt_syscall_x64.asm
# Compiled with Get-KeystoneAssembly => https://github.com/keystone-engine/keystone/tree/master/bindings/powershell
#-----------------------------
$x64SyscallStub = [Byte[]] @(
0x55, # push rbp
0x48, 0x89, 0xE5, # mov rbp, rsp
0x48, 0x81, 0xEC, 0x18, 0x01, 0x00, 0x00, # sub rsp, 118h
0x48, 0x89, 0xC8, # mov rax, rcx
0x49, 0x89, 0xD2, # mov r10, rdx
0x4C, 0x89, 0xC2, # mov rdx, r8
0x4D, 0x89, 0xC8, # mov r8, r9
0x48, 0x8B, 0x8D, 0x10, 0x01, 0x00, 0x00, # mov rcx, [rbp + 110h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x08, 0x01, 0x00, 0x00, # mov rcx, [rbp + 108h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x00, 0x01, 0x00, 0x00, # mov rcx, [rbp + 100h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xF8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0F8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xF0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0F0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xE8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0E8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xE0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0E0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xD8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0D8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xD0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0D0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xC8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0C8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xC0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0C0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xB8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0B8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xB0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0B0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xA8, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0A8h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0xA0, 0x00, 0x00, 0x00, # mov rcx, [rbp + 0A0h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x98, 0x00, 0x00, 0x00, # mov rcx, [rbp + 98h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x90, 0x00, 0x00, 0x00, # mov rcx, [rbp + 90h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x88, 0x00, 0x00, 0x00, # mov rcx, [rbp + 88h]
0x51, # push rcx
0x48, 0x8B, 0x8D, 0x80, 0x00, 0x00, 0x00, # mov rcx, [rbp + 80h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x78, # mov rcx, [rbp + 78h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x70, # mov rcx, [rbp + 70h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x68, # mov rcx, [rbp + 68h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x60, # mov rcx, [rbp + 60h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x58, # mov rcx, [rbp + 58h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x50, # mov rcx, [rbp + 50h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x48, # mov rcx, [rbp + 48h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x40, # mov rcx, [rbp + 40h]
0x51, # push rcx
0x48, 0x8B, 0x4D, 0x38, # mov rcx, [rbp + 38h]
0x51, # push rcx
0x4C, 0x8B, 0x4D, 0x30, # mov r9, [rbp + 30h]
0x4C, 0x89, 0xD1, # mov rcx, r10
0x0F, 0x05, # syscall
0x48, 0x89, 0xEC, # mov rsp, rbp
0x5D, # pop rbp
0xC3) # ret
if (!$SyscallStubPointer) {
# Alloc relevant syscall stub
if ([System.IntPtr]::Size -eq 4) {
[IntPtr]$Script:SyscallStubPointer = [Syscall]::VirtualAlloc([System.IntPtr]::Zero, $x86SyscallStub.Length, 0x3000, 0x40)
[System.Runtime.InteropServices.Marshal]::Copy($x86SyscallStub, 0, $SyscallStubPointer, $x86SyscallStub.Length)
} else {
[IntPtr]$Script:SyscallStubPointer = [Syscall]::VirtualAlloc([System.IntPtr]::Zero, $x64SyscallStub.Length, 0x3000, 0x40)
[System.Runtime.InteropServices.Marshal]::Copy($x64SyscallStub, 0, $SyscallStubPointer, $x64SyscallStub.Length)
}
}
# Courtesy of @mattifestation
# => http://www.exploit-monday.com/2012/05/accessing-native-windows-api-in.html
Function Get-DelegateType
{
Param
(
[OutputType([Type])]
[Parameter( Position = 0)]
[Type[]]
$Parameters = (New-Object Type[](0)),
[Parameter( Position = 1 )]
[Type]
$ReturnType = [Void]
)
$Domain = [AppDomain]::CurrentDomain
$DynAssembly = New-Object System.Reflection.AssemblyName('ReflectedDelegate')
$AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, [System.Reflection.Emit.AssemblyBuilderAccess]::Run)
$ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('InMemoryModule', $false)
$TypeBuilder = $ModuleBuilder.DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate])
$ConstructorBuilder = $TypeBuilder.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $Parameters)
$ConstructorBuilder.SetImplementationFlags('Runtime, Managed')
$MethodBuilder = $TypeBuilder.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $ReturnType, $Parameters)
$MethodBuilder.SetImplementationFlags('Runtime, Managed')
Write-Output $TypeBuilder.CreateType()
}
# Prepare delegate
if ($ParameterArray) {
$ParamCount = $ParameterArray.Length
$ParamList = [String]::Empty
for ($i=0;$i-lt$ParamCount;$i++) {
if ($ParameterArray[$i].Value) {
$ParamList += "[" + $ParameterArray[$i].Value.Name + "].MakeByRefType(), "
} else {
$ParamList += "[" + $ParameterArray[$i].Name + "], "
}
}
$ParamList = ($ParamList.Substring(0,$ParamList.Length-2)).Insert(0,", ")
}
$IEXBootstrap = "Get-DelegateType @([UInt16] $ParamList) ($ReturnType)"
$SyscallDelegate = IEX $IEXBootstrap
[System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($SyscallStubPointer, $SyscallDelegate)
}