var serializer = new XmlSerializer(typeof(PowershellCommand));

            // Говнокод, в процессе переделки
            var pwd = new NetworkCredential("", command.Password).SecurePassword;

            var psi = new ProcessStartInfo
            {
                Domain = command.Domain,
                UserName = command.UserName,
                Password = pwd,
                FileName = powershellHostPath,

                CreateNoWindow = true,

                RedirectStandardInput = true,
            };

            try
            {
                var process = Process.Start(psi);

                serializer.Serialize(process.StandardInput, command.Command);
                process.StandardInput.Close();

                return process;
            }
            catch (Win32Exception ex) when (ex.HResult == -2147467259 && ex.NativeErrorCode == 1326) // 0x80004005

        private PowershellCommand GetCommand()
        {
            if (Console.IsInputRedirected)
            {
                return ReadCommand(Console.In);
            } else {...}
    }

        private PowershellCommand ReadCommand(System.IO.TextReader textReader)
        {
            var serializer = new XmlSerializer(typeof(PowershellCommand));

            return (PowershellCommand)serializer.Deserialize(textReader);
        }