PracticalPCode/SampleCode/ResolveByAPIHash/Main.c at main · kohnakagawa/PracticalPCode · GitHub

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#include<stdio.h>
#include<stdint.h>
#include<string.h>
#include<intrin.h>

#include<Windows.h>
#include<winternl.h>

uint32_tcalc_dll_hash(constchar*dll_name,
uint32_tlen) {
uint32_thash=0;
for (uint32_ti=0; i<len; i++) {
hash=_rotr(hash, 0xd);
if (dll_name[i] >0x60) { // to uppercase
hash-=0x20;
 }
hash+= (uint32_t)dll_name[i];
 }
returnhash;
}

uint32_tcalc_fnc_hash(constchar*fnc_name,
uint32_tlen) {
uint32_thash=0;
for (uint32_ti=0; i<len; i++) {
hash=_rotr(hash, 0xd) + (uint32_t)fnc_name[i];
 }
returnhash;
}

voidshow_hashes(constchar*dll_name, constchar*fnc_name) {
constuint32_tdll_hash=calc_dll_hash(dll_name, (uint32_t)strlen(dll_name) +1);
constuint32_tfnc_hash=calc_fnc_hash(fnc_name, (uint32_t)strlen(fnc_name) +1);
printf("%x %x\n", dll_hash, fnc_hash);
}

#defineRVA2VA(type, base, offset) (type)((ULONG_PTR)base + offset)

LPVOIDsearch_exp_function(LPVOIDdll_base, DWORDdll_hash_target, DWORDfnc_hash_target) {
PIMAGE_DOS_HEADERdos= (PIMAGE_DOS_HEADER)dll_base;
PIMAGE_NT_HEADERSnt=RVA2VA(PIMAGE_NT_HEADERS, dll_base, dos->e_lfanew);
PIMAGE_DATA_DIRECTORYdir=nt->OptionalHeader.DataDirectory;
DWORDrva=dir[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
if (rva==0) returnNULL;
PIMAGE_EXPORT_DIRECTORYexp= (PIMAGE_EXPORT_DIRECTORY) RVA2VA(ULONG_PTR, dll_base, rva);
DWORDcnt=exp->NumberOfNames;
if (cnt==0) returnNULL;
PDWORDadr=RVA2VA(PDWORD, dll_base, exp->AddressOfFunctions);
PDWORDsym=RVA2VA(PDWORD, dll_base, exp->AddressOfNames);
PWORDord=RVA2VA(PWORD, dll_base, exp->AddressOfNameOrdinals);
PCHARdll=RVA2VA(PCHAR, dll_base, exp->Name);
DWORDdll_hash=calc_dll_hash(dll, (uint32_t)strlen(dll) +1);
if (dll_hash!=dll_hash_target) returnNULL;

LPVOIDapi_addr=NULL;
do {
PCHARapi=RVA2VA(PCHAR, dll_base, sym[cnt-1]);
if (calc_fnc_hash(api, (uint32_t)strlen(api) +1) ==fnc_hash_target) {
api_addr=RVA2VA(LPVOID, dll_base, adr[ord[cnt-1]]);
returnapi_addr;
 }
	} while (--cnt&&api_addr==0);
returnapi_addr;
}

typedefstruct {
ULONGLength;
BOOLEANInitialized;
PVOIDSsHandle;
LIST_ENTRYInLoadOrderModuleList;
LIST_ENTRYInMemoryOrderModuleList;
LIST_ENTRYInInitializationOrderModuleList;
} MY_PEB_LDR_DATA;

typedefstruct {
LIST_ENTRYInLoadOrderLinks;
LIST_ENTRYInMemoryOrderLinks;
LIST_ENTRYInInitializationOrderLinks;
PVOIDDllBase;
PVOIDEntryPoint;
ULONGSizeOfImage;
UNICODE_STRINGFullDllName;
UNICODE_STRINGBaseDllName;
} MY_LDR_DATA_TABLE_ENTRY;

LPVOIDresolve_api_addr(DWORDdll_hash, DWORDfnc_hash) {
LPVOIDapi_addr=NULL;
PPEBpeb=NtCurrentTeb()->ProcessEnvironmentBlock;
MY_PEB_LDR_DATA*ldr= (MY_PEB_LDR_DATA*)(peb->Ldr);
for (MY_LDR_DATA_TABLE_ENTRY*dte= (MY_LDR_DATA_TABLE_ENTRY*)ldr->InLoadOrderModuleList.Flink;
dte->DllBase!=0&&api_addr==NULL;
dte= (MY_LDR_DATA_TABLE_ENTRY*)dte->InLoadOrderLinks.Flink) {
LPVOIDdll_base=dte->DllBase;
api_addr=search_exp_function(dll_base, dll_hash, fnc_hash);
 }
returnapi_addr;
}

#defineKERNEL32_DLL_HASH 0x50bb715e
#defineGET_PROC_ADDRESS_HASH 0xe553e06f

voidtest_resolve_api_addr(constchar*dll_name,
constchar*fnc_name) {
HMODULEdll_base=LoadLibraryA(dll_name);
LPVOIDapi_addr0=NULL;
if (dll_base) {
api_addr0=GetProcAddress(dll_base, fnc_name);
 }

LPVOIDapi_addr1=resolve_api_addr(calc_dll_hash(dll_name, (uint32_t)strlen(dll_name) +1),
calc_fnc_hash(fnc_name, (uint32_t)strlen(fnc_name) +1));

if (api_addr0==api_addr1) {
puts("OK");
 }
else {
puts("NG");
 }
}

typedefNTSTATUS (NTAPI*pNtAlloateVirtualMemory)(
HANDLEProcessHandle,
PVOID*BaseAddress,
ULONG_PTRZeroBits,
PSIZE_TRegionSize,
ULONGAllocationType,
ULONGProtect
);
pNtAlloateVirtualMemoryfnNtAlloateVirtualMemory=NULL;

typedefNTSTATUS (NTAPI*pNtFlushInstructionCache)(
HANDLEProcessHandle,
PVOIDBaseAddress,
ULONGNumberOfBytesToFlush
);
pNtFlushInstructionCachefnNtFlushInstructionCache=NULL;

typedefNTSTATUS (NTAPI*pLdrLoadDll)(
ULONGLONGPathToFile,
PULONGFlags,
PUNICODE_STRINGModuleFileName,
PHANDLEModuleHandle
);
pLdrLoadDllfnLdrLoadDll=NULL;

typedefNTSTATUS (NTAPI*pRtlUnicodeStringToAnsiString)(
PANSI_STRINGDestinationString,
PUNICODE_STRINGSourceString,
BOOLEANAllocateDestinationString
);
pRtlUnicodeStringToAnsiStringfnRtlUnicodeStringToAnsiString=NULL;

typedefNTSTATUS (NTAPI*pRtlAnsiStringToUnicodeString)(
PUNICODE_STRINGDestinationString,
PANSI_STRINGSourceString,
BOOLEANAllocateDestinationString
);
pRtlAnsiStringToUnicodeStringfnRtlAnsiStringToUnicodeString=NULL;

typedefvoid (NTAPI*pRtlInitAnsiString)(
PANSI_STRINGDestinationString,
PSZSourceString
);
pRtlInitAnsiStringfnRtlInitAnsiString=NULL;

typedefvoid (NTAPI*pRtlFreeAnsiString)(PANSI_STRINGAnsiString);
pRtlFreeAnsiStringfnRtlFreeAnsiString=NULL;

typedefvoid (NTAPI*pRtlFreeUnicodeString)(PUNICODE_STRINGUnicodeString);
pRtlFreeUnicodeStringfnRtlFreeUnicodeString=NULL;

typedefNTSTATUS (NTAPI*pLdrGetProcedureAddressForCaller)(
HMODULEModuleHandle,
PANSI_STRINGFunctionName,
WORDOridinal,
PVOID*FunctionAddress,
BOOLbValue,
PVOIDCallbackAddress
);
pLdrGetProcedureAddressForCallerfnLdrGetProcedureAddressForCaller;

typedefint (WINAPI*pMessageBoxA)(HWNDhWnd, LPCSTRlpText, LPCSTRlpCaption, UINTuType);
pMessageBoxAfnMessageBoxA=NULL;

voidshow_all_hashes() {
show_hashes("user32.dll", "MessageBoxA");
show_hashes("ntdll.dll", "NtAlloateVirtualMemory");
show_hashes("ntdll.dll", "NtFlushInstructionCache");
show_hashes("ntdll.dll", "LdrLoadDll");
show_hashes("ntdll.dll", "RtlUnicodeStringToAnsiString");
show_hashes("ntdll.dll", "RtlAnsiStringToUnicodeString");
show_hashes("ntdll.dll", "RtlInitAnsiString");
show_hashes("ntdll.dll", "RtlFreeUnicodeString");
}

#defineUSER32_DLL_HASH 0x1031956f
#defineMESSAGE_BOXA_HASH 0x1545e26d

#defineNT_DLL_HASH 0xdf956ba6
#defineNT_ALLOCATE_VIRTUAL_MEMORY_HASH 0x9b8819a3
#defineNT_FLUSH_INSTRUCTION_CACHE_HASH 0x55c29a60
#defineLDR_LOAD_DLL_HASH 0x7f2584c4
#defineRTL_UNICODE_STRING_TO_ANSI_STRING_HASH 0xedb43455
#defineRTL_ANSI_STRING_TO_UNICODE_STRING_HASH 0x1c4f5b64
#defineRTL_INIT_ANSI_STRING_HASH 0x41ebe619
#defineRTL_FREE_UNICODE_STRING 0x01554596

voidresolve_all_apis() {
fnMessageBoxA=resolve_api_addr(USER32_DLL_HASH, MESSAGE_BOXA_HASH);
fnNtAlloateVirtualMemory=resolve_api_addr(NT_DLL_HASH, NT_ALLOCATE_VIRTUAL_MEMORY_HASH);
fnNtFlushInstructionCache=resolve_api_addr(NT_DLL_HASH, NT_FLUSH_INSTRUCTION_CACHE_HASH);
fnLdrLoadDll=resolve_api_addr(NT_DLL_HASH, LDR_LOAD_DLL_HASH);
fnRtlUnicodeStringToAnsiString=resolve_api_addr(NT_DLL_HASH, RTL_UNICODE_STRING_TO_ANSI_STRING_HASH);
fnRtlAnsiStringToUnicodeString=resolve_api_addr(NT_DLL_HASH, RTL_ANSI_STRING_TO_UNICODE_STRING_HASH);
fnRtlInitAnsiString=resolve_api_addr(NT_DLL_HASH, RTL_INIT_ANSI_STRING_HASH);
fnRtlFreeUnicodeString=resolve_api_addr(NT_DLL_HASH, RTL_FREE_UNICODE_STRING);
}

intmain() {
LoadLibraryA("user32.dll"); // to use MessageBoxA

// show_all_hashes();
resolve_all_apis();
fnMessageBoxA(NULL, "Hello", "Hello", MB_OK);
returnEXIT_SUCCESS;
}