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pe_reader.c
167 lines (125 loc) · 5.22 KB
/
pe_reader.c
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/* (c) Anasazi 2012 */
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <conio.h>
HANDLE hFile;
void Error()
{
char * szError;
static char szErrorBuf[128];
DWORD dwError = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&szError,
0, NULL );
_snprintf(szErrorBuf, sizeof(szErrorBuf), "\nExits with error: %s\n", szError);
printf("%s", szErrorBuf);
LocalFree(szError);
CloseHandle(hFile);
_getch();
exit(1);
}
DWORD RvaToOffset(IMAGE_NT_HEADERS32 * pNtHdr, DWORD dwRVA)
{
int i;
WORD wSections;
PIMAGE_SECTION_HEADER pSectionHdr;
pSectionHdr = IMAGE_FIRST_SECTION(pNtHdr);
wSections = pNtHdr->FileHeader.NumberOfSections;
for (i = 0; i < wSections; i++)
{
if (pSectionHdr->VirtualAddress <= dwRVA)
if ((pSectionHdr->VirtualAddress + pSectionHdr->Misc.VirtualSize) > dwRVA)
{
dwRVA -= pSectionHdr->VirtualAddress;
dwRVA += pSectionHdr->PointerToRawData;
return (dwRVA);
}
pSectionHdr++;
}
return 0;
}
int main()
{
PIMAGE_DOS_HEADER pDosHeader;
PIMAGE_NT_HEADERS pImageHeader;
PIMAGE_DATA_DIRECTORY pDataDirectory;
PIMAGE_IMPORT_DESCRIPTOR pImportDescriptor;
PIMAGE_THUNK_DATA32 pFirstThunk;
PIMAGE_THUNK_DATA32 pOriginalFirstThunk;
PIMAGE_IMPORT_BY_NAME pNameImg;
PIMAGE_SECTION_HEADER pSecHeader;
char szFileName[MAX_PATH];
DWORD dwName, dwTest;
LPDWORD lpwdAddress;
HANDLE hMap,
hMapView;
BOOL bFound = FALSE;
LPVOID lpMap;
printf("File: ");
scanf("%s", szFileName);
hFile = CreateFile(szFileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if(hFile == INVALID_HANDLE_VALUE)
Error();
hMap = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
if(!hMap)
Error();
hMapView = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
if(!hMapView)
Error();
pDosHeader = (PIMAGE_DOS_HEADER)hMapView;
if(pDosHeader->e_magic != IMAGE_DOS_SIGNATURE)
Error();
else
printf("\n%x (MZ) found, valid PE\nPE Header offset: 0x%x\n", pDosHeader->e_magic, pDosHeader->e_lfanew);
pImageHeader = (PIMAGE_NT_HEADERS)((char*)pDosHeader + pDosHeader->e_lfanew);
if(pImageHeader->Signature != IMAGE_NT_SIGNATURE)
Error();
else {
printf("\n%x (PE00) signature found\nImageBase: 0x%x\n\n", pImageHeader->Signature, pImageHeader->OptionalHeader.ImageBase);
if(pImageHeader->OptionalHeader.Subsystem == IMAGE_SUBSYSTEM_WINDOWS_GUI)
printf("\"%s\" is GUI based", szFileName);
else if(pImageHeader->OptionalHeader.Subsystem == IMAGE_SUBSYSTEM_WINDOWS_CUI)
printf("\"%s\" is CLI based", szFileName);
else
printf("\"%s\" is something else", szFileName);
}
printf("\nAddress of Entry Point: 0x%x", pImageHeader->OptionalHeader.AddressOfEntryPoint);
printf("\n\nLocating IAT\n");
pDataDirectory = &pImageHeader->OptionalHeader.DataDirectory[1];
pImportDescriptor = (PIMAGE_IMPORT_DESCRIPTOR)((char*)pDosHeader + RvaToOffset(pImageHeader, pDataDirectory->VirtualAddress));
pOriginalFirstThunk = (PIMAGE_THUNK_DATA32)((char*)pDosHeader + RvaToOffset(pImageHeader, pImportDescriptor->OriginalFirstThunk));
pSecHeader = IMAGE_FIRST_SECTION(pImageHeader);
printf("IAT Entrypoint: 0x%x\nDumping IAT...\n", (pDataDirectory - pSecHeader->VirtualAddress) + pSecHeader->PointerToRawData);
while(pImportDescriptor->OriginalFirstThunk != 0 && !bFound)
{
dwName = (DWORD)((char*)lpMap + RvaToOffset(pImageHeader, pImportDescriptor->Name));
pOriginalFirstThunk = (PIMAGE_THUNK_DATA32)((char*)pDosHeader + RvaToOffset(pImageHeader, pImportDescriptor->OriginalFirstThunk));
pFirstThunk = (PIMAGE_THUNK_DATA32)((char*)pDosHeader + RvaToOffset(pImageHeader, pImportDescriptor->FirstThunk));
while(pOriginalFirstThunk->u1.AddressOfData != 0 && !bFound)
{
pNameImg = (PIMAGE_IMPORT_BY_NAME)((char*)pDosHeader + RvaToOffset(pImageHeader, pOriginalFirstThunk->u1.AddressOfData));
dwTest = (DWORD)pOriginalFirstThunk->u1.Function & (DWORD)IMAGE_ORDINAL_FLAG32;
printf("\nAddr: 0x%x (0x%x) - Name: %s", pOriginalFirstThunk->u1.Function, pFirstThunk->u1.AddressOfData, (const char *)pNameImg->Name);
if(dwTest == 0)
if(strcmp("printf", (const char *)pNameImg->Name) == 0)
{
lpwdAddress = (LPDWORD)pFirstThunk->u1.Function;
bFound = TRUE;
}
pOriginalFirstThunk++;
pFirstThunk++;
}
pImportDescriptor++;
}
printf("\n...Done");
CloseHandle(hFile);
_getch();
return 0;
}