module_data.cpp

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#include "module_data.h"
 
#include "../utils/format_util.h"
#include "../utils/path_converter.h"
#include "../utils/process_util.h"
#include "../utils/artefacts_util.h"
#include "artefact_scanner.h"
 
#include <psapi.h>
#pragma comment(lib,"psapi.lib")
 
using namespace pesieve::util;
 
pesieve::ModulesCache cache;
//---
bool pesieve::ModuleData::loadModuleName()
{
    std::string my_name = pesieve::RemoteModuleData::getModuleName(processHandle, this->moduleHandle);
    if (my_name.length() == 0 || my_name.length() > MAX_PATH) {
        //invalid length
        return false;
    }
    memcpy(this->szModName, my_name.c_str(), my_name.length());
 
    // autoswitch the path to Wow64 mode if needed:
    autoswichIfWow64Mapping();
    return true;
}
 
bool pesieve::ModuleData::loadOriginal()
{
    //disable FS redirection by default
    bool is_ok = _loadOriginal(true);
    if (!is_ok) {
        //if loading with FS redirection has failed, try without
        is_ok = _loadOriginal(false);
    }
    return is_ok;
}
 
bool pesieve::ModuleData::_loadOriginal(bool disableFSredir)
{
    if (strlen(this->szModName) == 0) {
        loadModuleName();
    }
    //just in case if something was loaded before...
    peconv::free_pe_buffer(original_module, original_size);
 
    BOOL isRedirDisabled = FALSE;
    PVOID old_val;
    if (disableFSredir) {
        isRedirDisabled = wow64_disable_fs_redirection(&old_val);
        // try to load with FS redirection disabled
    }
    if (this->useCache) {
        original_module = cache.loadCached(szModName, original_size);
    }
    else {
        original_module = peconv::load_pe_module(szModName, original_size, false, false);
    }
 
    if (isRedirDisabled) {
        wow64_revert_fs_redirection(old_val);
    }
    if (!original_module) {
        return false;
    }
    this->is_dot_net = isDotNetManagedCode();
    return true;
}
 
 
bool pesieve::ModuleData::loadRelocatedFields(std::set<DWORD>& fields_rvas)
{
    if (!original_module || !original_size) {
        return false;
    }
    //---
    class CollectRelocField : public peconv::RelocBlockCallback
    {
    public:
        CollectRelocField(ModuleData &_mod, std::set<DWORD>& _fields)
            : RelocBlockCallback(_mod.is64bit()), mod(_mod), fields(_fields)
        {
        }
 
        virtual bool processRelocField(ULONG_PTR relocField)
        {
            DWORD reloc_rva = mod.vaToRva(relocField, (ULONG_PTR)mod.original_module);
            fields.insert(reloc_rva);
            return true;
        }
 
        std::set<DWORD> &fields;
        ModuleData &mod;
    };
    //---
    if (!peconv::has_valid_relocation_table(original_module, original_size)) {
        // No reloc table
        return false;
    }
    CollectRelocField collector(*this, fields_rvas);
    if (!peconv::process_relocation_table(original_module, original_size, &collector)) {
        // Could not collect relocations
        return false;
    }
    if (fields_rvas.size()) {
        return true;
    }
    return false;
}
 
bool pesieve::ModuleData::loadImportThunks(std::set<DWORD>& thunk_rvas)
{
    if (!original_module || !original_size) {
        return false;
    }
    if (!peconv::has_valid_import_table(original_module, original_size)) {
        // No import table
        return false;
    }
    if (!peconv::collect_thunks(original_module, original_size, thunk_rvas)) {
        // Could not collect thunks
        return false;
    }
    if (thunk_rvas.size()) {
        return true;
    }
    return false;
}
 
bool pesieve::ModuleData::loadImportsList(peconv::ImportsCollection &collection)
{
    if (!original_module || !original_size) {
        return false;
    }
    if (!peconv::has_valid_import_table(original_module, original_size)) {
        // No import table
        return false;
    }
    if (!peconv::collect_imports(original_module, original_size, collection)) {
        // Could not collect imports
        return false;
    }
    return true;
}
 
bool pesieve::ModuleData::relocateToBase(ULONGLONG new_base)
{
    if (!original_module) return false;
 
    ULONGLONG original_base = peconv::get_image_base(original_module);
    if (original_base == new_base) {
        return true; // already relocated
    }
    if (peconv::has_relocations(original_module) 
        && !peconv::relocate_module(original_module, original_size, new_base, original_base))
    {
#ifdef _DEBUG
        std::cerr << "[!] Relocating module failed!" << std::endl;
#endif
        return false;
    }
    peconv::update_image_base(original_module, new_base);
    return true;
}
 
 
bool pesieve::ModuleData::autoswichIfWow64Mapping()
{
    std::string mapped_name = pesieve::RemoteModuleData::getMappedName(processHandle, this->moduleHandle);
    std::string module_name = this->szModName;
    bool is_same = (to_lowercase(mapped_name) == to_lowercase(module_name));
 
    size_t mod_name_len = module_name.length();
    if (!is_same && mod_name_len > 0) {
        //check Wow64
        char path_copy[MAX_PATH] = { 0 };
        memcpy(path_copy, this->szModName, mod_name_len);
        convert_to_wow64_path(path_copy);
        is_same = (to_lowercase(mapped_name) == to_lowercase(path_copy));
        if (is_same) {
            this->switchToWow64Path();
            return true;
        }
    }
    return false;
}
 
bool pesieve::ModuleData::switchToWow64Path()
{
    BOOL isWow64 = FALSE;
    if (!is_process_wow64(this->processHandle, &isWow64)) {
        //failed to retrieve the info...
        return false;
    }
    if (isWow64) {
        if (pesieve::util::convert_to_wow64_path(szModName)) return true;
    }
    return false;
}
 
bool pesieve::ModuleData::switchToMappedPath()
{
    const std::string path = RemoteModuleData::getMappedName(this->processHandle, this->moduleHandle);
    const size_t len = path.length();
    if (len >= MAX_PATH) {
        return false;
    }
    ::memcpy(szModName, path.c_str(), len);
    szModName[len] = 0;
    return true;
}
 
bool pesieve::ModuleData::reloadWow64()
{
    if (!switchToWow64Path()) return false;
 
    //reload it and check again...
    peconv::free_pe_buffer(original_module, original_size);
    if (this->useCache) {
        original_module = cache.loadCached(szModName, original_size);
    }
    else {
        original_module = peconv::load_pe_module(szModName, original_size, false, false);
    }
    if (!original_module) {
#ifdef _DEBUG
        std::cout << "[-] Failed to reload: " << szModName << "\n";
#endif //_DEBUG
        return false;
    }
#ifdef _DEBUG
    std::cout << "[+] Reloaded: " << szModName << "\n";
#endif //_DEBUG
    return true;
}
 
bool pesieve::ModuleData::isDotNetManagedCode()
{
    //has a directory entry for .NET header
    IMAGE_DATA_DIRECTORY* dotNetDir = peconv::get_directory_entry(this->original_module, IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR);
    if (dotNetDir == nullptr) {
        //does not have .NET directory
        return false;
    }
    
    if (!peconv::get_dotnet_hdr(this->original_module, this->original_size, dotNetDir)){
        return false;
    }
#ifdef _DEBUG
    std::cout << "This is a .NET module" << std::endl;
#endif
    return true;
}
 
//----
 
std::string pesieve::RemoteModuleData::getModuleName(HANDLE processHandle, HMODULE modBaseAddr)
{
    char filename[MAX_PATH] = { 0 };
    if (!GetModuleFileNameExA(processHandle, modBaseAddr, filename, MAX_PATH)) {
        return "";
    }
    std::string basic_filename = pesieve::util::convert_to_win32_path(filename);
    std::string expanded = pesieve::util::expand_path(basic_filename);
    if (expanded.length() == 0) {
        return filename;
    }
    return expanded;
}
 
std::string pesieve::RemoteModuleData::getMappedName(HANDLE processHandle, LPVOID modBaseAddr)
{
    char filename[MAX_PATH] = { 0 };
    if (GetMappedFileNameA(processHandle, modBaseAddr, filename, MAX_PATH) == 0) {
        return "";
    }
    std::string expanded = pesieve::util::expand_path(filename);
    if (expanded.length() == 0) {
        return filename;
    }
    return expanded;
}
 
bool pesieve::RemoteModuleData::loadImportsList(peconv::ImportsCollection& collection)
{
    if (!isFullImageLoaded()) {
        return false;
    }
    if (!peconv::has_valid_import_table(imgBuffer, imgBufferSize)) {
        // No import table
        return false;
    }
    if (!peconv::collect_imports(imgBuffer, imgBufferSize, collection)) {
        // Could not collect imports
        return false;
    }
    return true;
}
 
bool pesieve::RemoteModuleData::init()
{
    this->isHdrReady = false;
    if (!loadHeader()) {
        return false;
    }
    this->isHdrReady = true;
    return true;
}
 
bool pesieve::RemoteModuleData::_loadFullImage(size_t mod_size)
{
    if (this->isFullImageLoaded()) {
        return true;
    }
    this->imgBuffer = peconv::alloc_pe_buffer(mod_size, PAGE_READWRITE);
    this->imgBufferSize = peconv::read_remote_pe(this->processHandle, (PBYTE)this->modBaseAddr, mod_size, this->imgBuffer, mod_size);
    if (this->imgBufferSize == mod_size) {
        return true;
    }
    this->freeFullImage();
    return false;
}
 
bool pesieve::RemoteModuleData::loadFullImage()
{
    if (this->isFullImageLoaded()) {
        return true;
    }
    size_t mod_size = this->getHdrImageSize();
    if (_loadFullImage(mod_size)) {
        return true;
    }
    //try again with calculated size:
    mod_size = calcImgSize();
    return _loadFullImage(mod_size);
}
 
bool pesieve::RemoteModuleData::loadHeader()
{
    if (!peconv::read_remote_pe_header(this->processHandle, (PBYTE)this->modBaseAddr, this->headerBuffer, peconv::MAX_HEADER_SIZE, this->isReflection)) {
        return false;
    }
    return true;
}
 
ULONGLONG pesieve::RemoteModuleData::getRemoteSectionVa(const size_t section_num)
{
    if (!this->isInitialized()) return 0;
 
    PIMAGE_SECTION_HEADER section_hdr = peconv::get_section_hdr(headerBuffer, peconv::MAX_HEADER_SIZE, section_num);
    if (!section_hdr || (section_hdr->SizeOfRawData == 0)) {
        return 0;
    }
    return (ULONGLONG) modBaseAddr + section_hdr->VirtualAddress;
}
 
bool pesieve::RemoteModuleData::isSectionEntry(const size_t section_number)
{
    if (!this->isInitialized()) {
        return false;
    }
    const DWORD ep_va = peconv::get_entry_point_rva(this->headerBuffer);
    if (ep_va == 0) {
        return false;
    }
    PIMAGE_SECTION_HEADER sec_hdr = peconv::get_section_hdr(this->headerBuffer, peconv::MAX_HEADER_SIZE, section_number);
    if (!sec_hdr) {
        return false;
    }
    if (ep_va >= sec_hdr->VirtualAddress 
        && ep_va < (sec_hdr->VirtualAddress + sec_hdr->Misc.VirtualSize))
    {
        return true;
    }
    return false;
}
 
bool pesieve::RemoteModuleData::isSectionExecutable(const size_t section_number, bool allow_data, bool allow_inaccessible)
{
    //for special cases when the section is not set executable in headers, but in reality is executable...
    //get the section header from the module:
    ULONGLONG start_va = getRemoteSectionVa(section_number);
    if (!start_va) {
        return false;
    }
    MEMORY_BASIC_INFORMATION page_info = { 0 };
    
    SIZE_T out = VirtualQueryEx(processHandle, (LPCVOID) start_va, &page_info, sizeof(page_info));
    if (out != sizeof(page_info)) {
#ifdef _DEBUG
        std::cerr << "Cannot retrieve remote section info" << std::endl;
#endif
        return false;
    }
#ifdef _DEBUG
    std::cout << std::hex << "Sec: " << section_number << " VA: " << start_va << " t: " << page_info.Type << " p: " << page_info.Protect << std::endl;
#endif
 
    if (pesieve::util::is_executable(page_info.Type, page_info.Protect)) {
        //std::cout << std::hex << "p1 Sec: " << section_number << " VA: " << start_va << " t: " << page_info.Type << " p: " << page_info.Protect << std::endl;
        return true;
    }
    if (allow_data) {
        if (pesieve::util::is_readable(page_info.Type, page_info.Protect)) {
            //std::cout << std::hex << "p1 Sec: " << section_number << " VA: " << start_va << " t: " << page_info.Type << " p: " << page_info.Protect << std::endl;
            return true;
        }
    }
    if (allow_inaccessible) {
        if (pesieve::util::is_normal_inaccessible(page_info.State, page_info.Type, page_info.Protect)) {
            //std::cout << "[" << section_number << "] Inaccessible section found!\n";
            return true;
        }
    }
    return false;
}
 
bool pesieve::RemoteModuleData::hasExecutableSection(bool allow_data, bool allow_inaccessible)
{
    size_t sec_count = peconv::get_sections_count(this->headerBuffer, peconv::MAX_HEADER_SIZE);
    for (size_t i = 0; i < sec_count ; i++) {
        if (isSectionExecutable(i, allow_data, allow_inaccessible)) {
            return true;
        }
    }
    return false;
}
 
//calculate image size basing on the sizes of sections
size_t pesieve::RemoteModuleData::calcImgSize()
{
    if (!isHdrReady) return 0;
 
    return ArtefactScanner::calcImgSize(this->processHandle, this->modBaseAddr, this->headerBuffer, peconv::MAX_HEADER_SIZE);
}