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Перехват API функции в Delphi 7
library ApiHk;
uses
TLHelp32,
windows;
type
fr_jmp = packed record
PuhsOp: byte;
PushArg: pointer;
RetOp: byte;
end;
OldCode = packed record
One: dword;
two: word;
end;
var
AdrCreateProcessA: pointer;
OldCrp: OldCode;
JmpCrProcA: fr_jmp;
Function OpenThread(dwDesiredAccess: dword; bInheritHandle: bool; dwThreadId: dword):dword;
stdcall; external 'kernel32.dll';
Procedure StopThreads;
var
h, CurrTh, ThrHandle, CurrPr: dword;
Thread: TThreadEntry32;
begin
CurrTh := GetCurrentThreadId;
CurrPr := GetCurrentProcessId;
h := CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if h <> INVALID_HANDLE_VALUE then
begin
Thread.dwSize := SizeOf(TThreadEntry32);
if Thread32First(h, Thread) then
repeat
if (Thread.th32ThreadID <> CurrTh) and (Thread.th32OwnerProcessID = CurrPr) then
begin
ThrHandle := OpenThread(THREAD_SUSPEND_RESUME, false, Thread.th32ThreadID);
if ThrHandle>0 then
begin
SuspendThread(ThrHandle);
CloseHandle(ThrHandle);
end;
end;
until not Thread32Next(h, Thread);
CloseHandle(h);
end;
end;
Procedure RunThreads;
var
h, CurrTh, ThrHandle, CurrPr: dword;
Thread: TThreadEntry32;
begin
CurrTh := GetCurrentThreadId;
CurrPr := GetCurrentProcessId;
h := CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if h <> INVALID_HANDLE_VALUE then
begin
Thread.dwSize := SizeOf(TThreadEntry32);
if Thread32First(h, Thread) then
repeat
if (Thread.th32ThreadID <> CurrTh) and (Thread.th32OwnerProcessID = CurrPr) then
begin
ThrHandle := OpenThread(THREAD_SUSPEND_RESUME, false, Thread.th32ThreadID);
if ThrHandle>0 then
begin
ResumeThread(ThrHandle);
CloseHandle(ThrHandle);
end;
end;
until not Thread32Next(h, Thread);
CloseHandle(h);
end;
end;
function TrueCreateProcessA(lpApplicationName: PChar;
lpCommandLine: PChar;
lpProcessAttributes,
lpThreadAttributes: PSecurityAttributes;
bInheritHandles: BOOL;
dwCreationFlags: DWORD;
lpEnvironment: Pointer;
lpCurrentDirectory: PChar;
const l
pStartupInfo: TStartupInfo;
var
lpProcessInformation: TProcessInformation): BOOL;
begin
//снятие перехвата
WriteProcessMemory(CurrProc, AdrCreateProcessA, @OldCrp, SizeOf(OldCode), Writen);
//вызов функции
result := CreateProcess(lpApplicationName, lpCommandLine, lpProcessAttributes,
lpThreadAttributes, bInheritHandles, dwCreationFlags or
CREATE_SUSPENDED, lpEnvironment, nil, lpStartupInfo,
lpProcessInformation);
//установка перехвата
WriteProcessMemory(CurrProc, AdrCreateProcessA, @JmpCrProcA, SizeOf(far_jmp), Writen);
end;
function NewCreateProcessA(lpApplicationName: PChar;
lpCommandLine: PChar;
lpProcessAttributes,
lpThreadAttributes: PSecurityAttributes;
bInheritHandles: BOOL;
dwCreationFlags: DWORD;
lpEnvironment: Pointer;
lpCurrentDirectory: PChar;
const
lpStartupInfo: TStartupInfo;
var
lpProcessInformation: TProcessInformation): BOOL; stdcall;
begin
///////////////////////////////////////
///обработчик CreateProcessA///
//////////////////////////////////////
end;
Procedure SetHook;
var
HKernel32, HUser32: dword;
begin
CurrProc := GetCurrentProcess;
//получение адреса CreateProcessA
AdrCreateProcessA := GetProcAddress(GetModuleHandle(’kernel32.dll’), ’CreateProcessA’);
//инициализация структуры перехвата CreateProcessA
JmpCrProcA.PuhsOp := $68;
JmpCrProcA.PushArg := @NewCreateProcessA;
JmpCrProcA.RetOp := $C3;
//сохраняем старое начало функции
ReadProcessMemory(CurrProc, AdrCreateProcessA, @OldCrp, SizeOf(OldCode), bw);
//записываем новое начало CreateProcessA
WriteProcessMemory(CurrProc, AdrCreateProcessA, @JmpCrProcA, SizeOf(far_jmp), Writen);
end;
begin
//останавливаем побочные нити
StopThreads;
//устанавливаем перехват
SetHook;
//запускаем нити
RunThreads;
end.
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| Категория: }I{ack | Добавил: TERMINATOR (29.03.2010)
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| Просмотров: 5661 | Комментарии: 1
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