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TextSectionHasher.cpp
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TextSectionHasher.cpp
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#include <Windows.h>
#include <TlHelp32.h>
#include <DbgHelp.h>
#include <stdio.h>
#include <string.h>
#include <thread>
#include <vector>
typedef struct {
LPVOID lpVirtualAddress;
DWORD dwSizeOfRawData;
} SECTIONINFO, *PSECTIONINFO;
typedef struct {
DWORD64 dwRealHash;
SECTIONINFO SectionInfo;
} HASHSET, *PHASHSET;
int GetAllModule(std::vector<LPVOID>& modules) {
MODULEENTRY32W mEntry;
memset(&mEntry, 0, sizeof(mEntry));
mEntry.dwSize = sizeof(MODULEENTRY32);
DWORD curPid = GetCurrentProcessId();
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, NULL);
if (Module32FirstW(hSnapshot, &mEntry)) {
do {
modules.emplace_back(mEntry.modBaseAddr);
} while (Module32NextW(hSnapshot, &mEntry));
}
CloseHandle(hSnapshot);
if (modules.empty()) {
return -1;
}
return 0;
}
int GetTextSectionInfo(LPVOID lpModBaseAddr, PSECTIONINFO info) {
PIMAGE_NT_HEADERS pNtHdr = ImageNtHeader(lpModBaseAddr);
PIMAGE_SECTION_HEADER pSectionHeader = (PIMAGE_SECTION_HEADER)(pNtHdr + 1);
LPVOID lpTextAddr = NULL;
DWORD dwSizeOfRawData = NULL;
for (int i = 0; i < pNtHdr->FileHeader.NumberOfSections; ++i) {
char *name = (char *)pSectionHeader->Name;
if (!strcmp(name, ".text")) {
info->lpVirtualAddress = (LPVOID)((DWORD64)lpModBaseAddr + pSectionHeader->VirtualAddress);
info->dwSizeOfRawData = pSectionHeader->SizeOfRawData;
break;
}
++pSectionHeader;
}
if (info->dwSizeOfRawData == NULL) {
return -1;
}
return 0;
}
DWORD64 HashSection(LPVOID lpSectionAddress, DWORD dwSizeOfRawData) {
DWORD64 hash = 0;
BYTE *str = (BYTE *)lpSectionAddress;
for (int i = 0; i < dwSizeOfRawData; ++i, ++str) {
if (*str) {
hash = *str + (hash << 6) + (hash << 16) - hash;
}
}
return hash;
}
bool bTerminateThread = false;
void CheckTextHash(PHASHSET pHashSet) {
DWORD64 dwRealHash = pHashSet->dwRealHash;
DWORD dwSizeOfRawData = pHashSet->SectionInfo.dwSizeOfRawData;
LPVOID lpVirtualAddress = pHashSet->SectionInfo.lpVirtualAddress;
while (1) {
Sleep(1000);
DWORD64 dwCurrentHash = HashSection(lpVirtualAddress, dwSizeOfRawData);
if (dwRealHash != dwCurrentHash) {
MessageBoxW(NULL, L"DebugAttached", L"WARN", MB_OK);
exit(1);
}
if (bTerminateThread) {
return;
}
}
}
int ExitThreads(std::vector<std::thread>& threads) {
bTerminateThread = true;
for (auto& thread : threads) {
thread.join();
}
return 0;
}
int main() {
std::vector<LPVOID> modules;
GetAllModule(modules);
std::vector<std::thread> threads;
threads.reserve(modules.size());
std::vector<HASHSET> hashes;
hashes.reserve(modules.size());
for (auto& module : modules) {
SECTIONINFO info;
GetTextSectionInfo(module, &info);
DWORD64 dwRealHash = HashSection(info.lpVirtualAddress, info.dwSizeOfRawData);
hashes.emplace_back(HASHSET { dwRealHash, info });
threads.emplace_back(std::thread(CheckTextHash, &hashes.back()));
}
int num1, num2;
printf("[*] num1 num2 : ");
scanf("%d %d", &num1, &num2);
printf("[*] result : %d\n\n", num1 + num2);
printf("[*] wait for terminating thread..\n");
ExitThreads(threads);
return 0;
}