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function Get-DllLoadPath {
<#
.Synopsis
PowerSploit Module - Get-DllLoadPath
Author: Matthew Graeber (@mattifestation)
License: BSD 3-Clause
.Description
Get-DllLoadPath returns the path from which Windows will load a Dll for the given executable.
.Parameter ExecutablePath
Path to the executable from which the Dll would be loaded.
.Parameter DllName
Name of the Dll in the form 'dllname.dll'.
.Example
PS> Get-DllLoadPath C:\Windows\System32\cmd.exe kernel32.dll
Path
----
C:\Windows\system32\kernel32.dll
.Example
PS> Get-DllLoadPath C:\Windows\SysWOW64\calc.exe Comctl32.dll
Path
----
C:\Windows\SysWOW64\Comctl32.dll
.Outputs
None or System.Management.Automation.PathInfo
.Notes
This script will not detect if the executable provided intentionally alters the Dll search path via
LoadLibraryEx, SetDllDirectory, or AddDllDirectory.
.Link
My blog: http://www.exploit-monday.com
Dll Search Order Reference: http://msdn.microsoft.com/en-us/library/windows/desktop/ms682586%28v=vs.85%29.aspx
#>
Param (
[Parameter(Position = 0, Mandatory = $True)] [String] $ExecutablePath,
[Parameter(Position = 1, Mandatory = $True)] [String] $DllName
)
if (!(Test-Path $ExecutablePath)) {
Write-Warning 'Invalid path or file does not exist.'
return
} else {
$ExecutablePath = Resolve-Path $ExecutablePath
$ExecutableDirectory = Split-Path $ExecutablePath
}
if ($DllName.Contains('.dll')) {
$DllNameShort = $DllName.Split('.')[0]
} else {
Write-Warning 'You must provide a proper dll name (i.e. kernel32.dll)'
return
}
function Get-PEArchitecture {
Param ( [Parameter(Position = 0, Mandatory = $True)] [String] $Path )
# Parse PE header to see if binary was compiled 32 or 64-bit
$FileStream = New-Object System.IO.FileStream($Path, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read)
[Byte[]] $MZHeader = New-Object Byte[](2)
$FileStream.Read($MZHeader,0,2) | Out-Null
$Header = [System.Text.AsciiEncoding]::ASCII.GetString($MZHeader)
if ($Header -ne 'MZ') {
Write-Warning 'Invalid PE header.'
$FileStream.Close()
return
}
# Seek to 0x3c - IMAGE_DOS_HEADER.e_lfanew (i.e. Offset to PE Header)
$FileStream.Seek(0x3c, [System.IO.SeekOrigin]::Begin) | Out-Null
[Byte[]] $lfanew = New-Object Byte[](4)
# Read offset to the PE Header (will be read in reverse)
$FileStream.Read($lfanew,0,4) | Out-Null
$PEOffset = [Int] ('0x{0}' -f (( $lfanew[-1..-4] | % { $_.ToString('X2') } ) -join ''))
# Seek to IMAGE_FILE_HEADER.IMAGE_FILE_MACHINE
$FileStream.Seek($PEOffset + 4, [System.IO.SeekOrigin]::Begin) | Out-Null
[Byte[]] $IMAGE_FILE_MACHINE = New-Object Byte[](2)
# Read compiled architecture
$FileStream.Read($IMAGE_FILE_MACHINE,0,2) | Out-Null
$Architecture = '{0}' -f (( $IMAGE_FILE_MACHINE[-1..-2] | % { $_.ToString('X2') } ) -join '')
$FileStream.Close()
if (($Architecture -ne '014C') -and ($Architecture -ne '8664')) {
Write-Warning 'Invalid PE header or unsupported architecture.'
return
}
if ($Architecture -eq '014C') {
return 'X86'
} elseif ($Architecture -eq '8664') {
return 'X64'
} else {
return 'OTHER'
}
}
# Check if SafeDllSearch is disabled. Note: The logic of this check will fail in XP SP0/1
$UnsafeSearch = $False
$SearchMode = (Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager').SafeDllSearchMode
if ($SearchMode -eq 0) { $UnsafeSearch = $True }
$OSArch = (Get-WmiObject Win32_OperatingSystem -Property OSArchitecture).OSArchitecture
$PEArch = Get-PEArchitecture $ExecutablePath
$KnownDlls = Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\KnownDLLs'
if ($OSArch -eq '32-bit') {
$DllDirectory = Resolve-Path $KnownDlls.DllDirectory
} else {
if ($PEArch -eq 'X86') {
$DllDirectory = Resolve-Path $KnownDlls.DllDirectory32
} else {
$DllDirectory = Resolve-Path $KnownDlls.DllDirectory
}
}
if ($KnownDlls | Get-Member -MemberType NoteProperty | Where-Object { $_.Name -eq $DllNameShort }) {
$Expression = '$KnownDlls.' + "$DllNameShort"
$Filename = Invoke-Expression $Expression
return Resolve-Path (Join-Path $DllDirectory $Filename)
}
$FoundInAppDirectory = Get-ChildItem (Join-Path $ExecutableDirectory $DllName) -ErrorAction SilentlyContinue
if ($FoundInAppDirectory) { return Resolve-Path $FoundInAppDirectory.FullName }
if ($UnsafeSearch) {
$FoundInWorkingDirectory = Get-ChildItem (Join-Path (Get-Location) $DllName) -ErrorAction SilentlyContinue
if ($FoundInWorkingDirectory) { return Resolve-Path $FoundInWorkingDirectory.FullName }
}
$FoundInSystemDirectory = Get-ChildItem (Join-Path $DllDirectory $DllName) -ErrorAction SilentlyContinue
if ($FoundInSystemDirectory) { return Resolve-Path $FoundInSystemDirectory.FullName }
$FoundIn16BitSystemDir = Get-ChildItem "$($Env:windir)\System\$DllName" -ErrorAction SilentlyContinue
if ($FoundIn16BitSystemDir) { return Resolve-Path $FoundIn16BitSystemDir.FullName }
$FoundInWindowsDirectory = Get-ChildItem "$($Env:windir)\$DllName" -ErrorAction SilentlyContinue
if ($FoundInWindowsDirectory) { return Resolve-Path $FoundInWindowsDirectory.FullName }
if (!$UnsafeSearch) {
$FoundInWorkingDirectory = Get-ChildItem (Join-Path (Get-Location) $DllName) -ErrorAction SilentlyContinue
if ($FoundInWorkingDirectory) { return Resolve-Path $FoundInWorkingDirectory.FullName }
}
$Env:Path.Split(';') | ForEach-Object {
if ($_ -match '%(.{1,})%') {
$TempPath = $_.Replace($Matches[0], [Environment]::GetEnvironmentVariable($Matches[1]))
} else {
$TempPath = $_
}
$FoundInPathEnvVar = Get-ChildItem (Join-Path $TempPath $DllName) -ErrorAction SilentlyContinue
if ($FoundInPathEnvVar) { return Resolve-Path $FoundInPathEnvVar.FullName }
}
}
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