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VEHloader.cpp
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#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
unsigned char dynamic_xor_key = 0x1C;
unsigned char* shellcode;
unsigned char* original_shellcode;
SIZE_T shellcodeSize;
DWORD previousEip = 0;
//int innum = 0;
//int outnum = 0;
bool ischangeEIP = false;
bool* changeOffset;
bool in = false;
DWORD mypreviousEip;
DWORD shellcode_start;
DWORD shellcode_end;
DWORD EIPoffset;
MEMORY_BASIC_INFORMATION mbi;
bool debug = false;
EXCEPTION_POINTERS* myExceptionInfo;
DWORD oldProtect;
bool isxor = false;
void saveShellcodeToFile(const char* filename, unsigned char* shellcode, SIZE_T shellcodeSize) {
FILE* file = fopen(filename, "wb");
if (file == NULL) {
perror("Error opening file");
return;
}
SIZE_T written = fwrite(shellcode, 1, shellcodeSize, file);
if (written != shellcodeSize) {
perror("Error writing to file");
}
else {
printf("Shellcode written to file successfully.\n");
}
fclose(file);
}
void encprocent() {
double percentage;
int a = 0;
for (size_t i = 0; i < shellcodeSize; i++) {
if (changeOffset[i]) {
a++;
}
}
percentage = ((double)a / (double)shellcodeSize) * 100;
printf("Percentage: %.2f%%\n", percentage);
}
//void printShellcode() {
// printf("Shellcode (size: %zu):\n", shellcodeSize);
// for (size_t i = 0; i < shellcodeSize; i++) {
// if (isxor && encryptOffset[i]) {
// printf("\\x%02x", shellcode[i] ^ dynamic_xor_key);
// }
// else {
// printf("\\x%02x", shellcode[i]);
// }
//
// if ((i + 1) % 16 == 0) { // 每16个字节换行
// printf("\n");
// }
// }
// printf("\n");
//}
// 定义操作类型
typedef enum {
ENCRYPT,
DECRYPT,
MEMAddr,
SHELLCODE
} OperationType;
void operateShellcode(OperationType operation, OperationType type, uint32_t addr) {
//printf("addr:%x\n", addr);
if (!isxor) {
return;
}
size_t length =15;
if (type == MEMAddr) {
length = 4;
}
uint32_t offset = addr - shellcode_start;
if (addr >= shellcode_start && addr <= shellcode_end) {
for (SIZE_T i = 0; i < length; ++i) {
if (shellcodeSize -(offset +i) > 0) {
if (!changeOffset[offset+i]) {
if (shellcode[offset+i]==original_shellcode[offset+i]) {
if (operation == DECRYPT) {
shellcode[offset+i] ^=dynamic_xor_key;
}
continue;
}
if (shellcode[offset+i] == (original_shellcode[offset+i]^dynamic_xor_key)) {
if (operation == ENCRYPT) {
shellcode[offset+i] = original_shellcode[offset+i];
}
continue;
}
changeOffset[offset+i] = true;
printf("EIP:%x,Old:%x New:%x\n",previousEip, original_shellcode[offset + i] ^ dynamic_xor_key, shellcode[offset+i]);
}
}
}
}
}
typedef struct {
uint32_t eax;
uint32_t ecx;
uint32_t edx;
uint32_t ebx;
uint32_t esp;
uint32_t ebp;
uint32_t esi;
uint32_t edi;
uint32_t eip; // eip 通常不在 ModR/M 中使用，但保留在结构体中以保持一致性
} Registers;
// 模拟的寄存器实例
Registers regs = { 0 };
// 内存读取函数
int read_memory(uint32_t address, uint32_t* value) {
SIZE_T bytesRead;
// 尝试读取内存
if (ReadProcessMemory(GetCurrentProcess(), (LPCVOID)address, value, sizeof(*value), &bytesRead) && bytesRead == sizeof(*value)) {
return 1; // 成功读取内存
}
else {
//printf("Failed to read memory at address 0x%08X\n", address);
return 0; // 内存读取失败
}
}
void parse_modrm(uint8_t modrm, uint8_t* mod, uint8_t* reg, uint8_t* rm) {
*mod = (modrm >> 6) & 0x03;
*reg = (modrm >> 3) & 0x07;
*rm = modrm & 0x07;
}
void parse_sib(uint8_t sib, uint8_t* scale, uint8_t* index, uint8_t* base) {
*scale = (sib >> 6) & 0x03;
*index = (sib >> 3) & 0x07;
*base = sib & 0x07;
}
uint32_t get_register_value(uint8_t reg, Registers* regs) {
switch (reg) {
case 0: return regs->eax;
case 1: return regs->ecx;
case 2: return regs->edx;
case 3: return regs->ebx;
case 4: return regs->esp;
case 5: return regs->ebp;
case 6: return regs->esi;
case 7: return regs->edi;
default: return 0; // 无效寄存器编号
}
}
uint32_t calculate_memory_address(uint8_t* opcode, int* offset, uint8_t mod, uint8_t rm, Registers* regs, uint8_t has_sib, uint8_t scale, uint8_t index, uint8_t base) {
uint32_t address = 0;
switch (mod) {
case 0:
if (has_sib) {
address = get_register_value(base, regs) + (get_register_value(index, regs) << scale);
if (base == 5) {
uint32_t disp;
if (!read_memory(*(uint32_t*)(opcode + *offset), &disp)) {
return 0; // 读取失败
}
address += disp;
*offset += 4;
}
}
else if (rm == 5) {
uint32_t disp;
if (!read_memory(*(uint32_t*)(opcode + *offset), &disp)) {
return 0; // 读取失败
}
address = disp;
*offset += 4;
}
else {
address = get_register_value(rm, regs);
}
break;
case 1:
if (has_sib) {
address = get_register_value(base, regs) + (get_register_value(index, regs) << scale) + (int8_t)opcode[*offset];
}
else {
address = get_register_value(rm, regs) + (int8_t)opcode[*offset];
}
*offset += 1;
break;
case 2:
if (has_sib) {
uint32_t disp;
if (!read_memory(*(uint32_t*)(opcode + *offset), &disp)) {
return 0; // 读取失败
}
address = get_register_value(base, regs) + (get_register_value(index, regs) << scale) + disp;
}
else {
uint32_t disp;
if (!read_memory(*(uint32_t*)(opcode + *offset), &disp)) {
return 0; // 读取失败
}
address = get_register_value(rm, regs) + disp;
}
*offset += 4;
break;
case 3:
// Register-direct addressing, no memory address used.
return 0;
}
return address;
}
uint32_t analyze_instruction(uint8_t* opcode, Registers* regs) {
uint8_t mod = 0, reg = 0, rm = 0, scale = 0, index = 0, base = 0;
uint32_t address = 0;
int offset = 0;
uint8_t has_sib = 0;
// 处理前缀字节
while (opcode[offset] == 0xF0 || opcode[offset] == 0xF2 || opcode[offset] == 0xF3 || // 锁前缀和重复前缀
opcode[offset] == 0x2E || opcode[offset] == 0x36 || opcode[offset] == 0x3E || // 段前缀
opcode[offset] == 0x26 || opcode[offset] == 0x64 || opcode[offset] == 0x65 || // 段前缀
opcode[offset] == 0x66 || opcode[offset] == 0x67) { // 操作数大小和地址大小前缀
offset++;
}
// 获取操作码
uint8_t primary_opcode = opcode[offset++];
if (primary_opcode == 0xF3 && opcode[offset] == 0xA4) {
// 处理 REP MOVSB 指令
uint32_t src_address = get_register_value(6, regs); // ESI 寄存器
uint32_t dest_address = get_register_value(7, regs); // EDI 寄存器
uint32_t count = get_register_value(1, regs); // ECX 寄存器
return src_address; // 或者其他需要的返回信息
}
if (primary_opcode == 0xA4) {
// 处理 MOVSB 指令
uint32_t src_address = get_register_value(6, regs); // ESI 寄存器
uint32_t dest_address = get_register_value(7, regs); // EDI 寄存器
return src_address; // 或者其他需要的返回信息
}
// 处理其他字符串指令
if (primary_opcode == 0xA5 || primary_opcode == 0xAA || primary_opcode == 0xAB ||
primary_opcode == 0xAC || primary_opcode == 0xAD || primary_opcode == 0xAE ||
primary_opcode == 0xAF || primary_opcode == 0xA6 || primary_opcode == 0xA7) {
// 这里可以添加更多字符串指令的处理逻辑
return get_register_value(6, regs); // 根据需要返回合适的地址或信息
}
if (primary_opcode == 0x0F) {
// 处理两字节操作码
uint8_t secondary_opcode = opcode[offset++];
switch (secondary_opcode) {
case 0xB6: // MOVZX r16, r/m8
case 0xB7: // MOVZX r32, r/m16
case 0xBE: // MOVSX r16, r/m8
case 0xBF: // MOVSX r32, r/m16
case 0xAF: // IMUL r32, r/m32
case 0xA3: // BT r/m32, r32
case 0xAB: // BTS r/m32, r32
case 0xB3: // BTR r/m32, r32
case 0xBB: // BTC r/m32, r32
case 0xC0: // XADD r/m8, r8
case 0xC1: // XADD r/m32, r32
{
uint8_t modrm_byte = opcode[offset++];
parse_modrm(modrm_byte, &mod, ®, &rm);
if (rm == 4 && mod != 3) { // SIB byte is present
uint8_t sib_byte = opcode[offset++];
parse_sib(sib_byte, &scale, &index, &base);
has_sib = 1;
}
address = calculate_memory_address(opcode, &offset, mod, rm, regs, has_sib, scale, index, base);
return address;
}
default:
return 0; // 不支持的两字节操作码
}
}
else if ((primary_opcode & 0xFC) == 0x80 || // 80-83 二进制操作（带 ModR/M）
(primary_opcode & 0xF0) == 0x00 || // 00-0F 一些常见操作（带 ModR/M）
(primary_opcode & 0xF0) == 0x20 || // 20-2F 一些常见操作（带 ModR/M）
(primary_opcode & 0xF0) == 0x30 || // 30-3F 一些常见操作（带 ModR/M）
(primary_opcode & 0xF0) == 0x60 || // 60-6F 一些常见操作（带 ModR/M）
(primary_opcode & 0xF0) == 0x70 || // 70-7F 一些常见跳转（带 ModR/M）
(primary_opcode & 0xF8) == 0xC0 || // C0-C1, C6-C7 操作
(primary_opcode & 0xFE) == 0xD0 || // D0-D3 操作
(primary_opcode & 0xF8) == 0xF6 || // F6-F7 操作
(primary_opcode >= 0x40 && primary_opcode <= 0x5F) || // 40-5F inc/dec和其他操作
(primary_opcode & 0xF8) == 0xD8 || // D8-DF 浮点运算
(primary_opcode & 0xF8) == 0xE0 || // E0-E3 循环控制
(primary_opcode & 0xFC) == 0xF0 || // F0-F3 预取前缀或锁前缀（带 ModR/M）
(primary_opcode & 0xFE) == 0x88 || // 88-8B 移动（带 ModR/M）
(primary_opcode & 0xFC) == 0xA0 || // A0-A3 移动和其他操作（带 ModR/M）
(primary_opcode & 0xFC) == 0xB0 || // B0-B7 移动（带 ModR/M）
(primary_opcode & 0xF0) == 0x50) { // 50-5F 推和弹（带 ModR/M）
// 需要解析 ModR/M 字节
uint8_t modrm_byte = opcode[offset++];
parse_modrm(modrm_byte, &mod, ®, &rm);
if (rm == 4 && mod != 3) { // SIB byte is present
uint8_t sib_byte = opcode[offset++];
parse_sib(sib_byte, &scale, &index, &base);
has_sib = 1;
}
address = calculate_memory_address(opcode, &offset, mod, rm, regs, has_sib, scale, index, base);
return address;
}
return 0; // Instruction does not involve memory address computation.
}
void operateOPMEMADDR() {
BYTE* eipPtr = reinterpret_cast<BYTE*>(previousEip);
BYTE bytes[15];
if (in && isxor) {
for (int i = 0; i < 15; ++i) {
if (previousEip + i <= shellcode_end) {
bytes[i] = *(eipPtr + i);
}
}
regs.eax = myExceptionInfo->ContextRecord->Eax;
regs.ebx = myExceptionInfo->ContextRecord->Ebx;
regs.ecx = myExceptionInfo->ContextRecord->Ecx;
regs.edx = myExceptionInfo->ContextRecord->Edx;
regs.esi = myExceptionInfo->ContextRecord->Esi;
regs.edi = myExceptionInfo->ContextRecord->Edi;
regs.ebp = myExceptionInfo->ContextRecord->Ebp;
regs.esp = myExceptionInfo->ContextRecord->Esp;
regs.eip = myExceptionInfo->ContextRecord->Eip;
DWORD OPMEMaddr = (DWORD)analyze_instruction(bytes, ®s);
if (OPMEMaddr) {
//printf("[in] The memory address to be accessed by the next assembly instruction is:%x\n", OPMEMaddr);
if (OPMEMaddr >= shellcode_start && OPMEMaddr <= shellcode_end) {
//printf("[in] EIP:%x OPMENADDR:%x\n", eipPtr, OPMEMaddr);
operateShellcode(DECRYPT, MEMAddr, OPMEMaddr);
}
else {
}
}
}
}
BYTE c1 =0;
LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS* ExceptionInfo) {
myExceptionInfo = ExceptionInfo;
mypreviousEip = previousEip;
previousEip = ExceptionInfo->ContextRecord->Eip;
shellcode_start = (DWORD)shellcode;
shellcode_end = shellcode_start + shellcodeSize;
EIPoffset = ExceptionInfo->ContextRecord->Eip - shellcode_start;
in = ExceptionInfo->ContextRecord->Eip >= shellcode_start && ExceptionInfo->ContextRecord->Eip <= shellcode_end;
//if (debug) {
// printf("EIP -> %x\n", previousEip);
//}
SIZE_T result = VirtualQuery(shellcode, &mbi, sizeof(mbi));
if (mbi.Protect != PAGE_NOACCESS) {
operateShellcode(ENCRYPT, SHELLCODE,mypreviousEip);
if (in) {
operateShellcode(DECRYPT, SHELLCODE,previousEip);
}
}
if (!(in && mbi.Protect == PAGE_NOACCESS)) {
operateOPMEMADDR();
}
if (ExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_ACCESS_VIOLATION) {
DWORD_PTR faultingAddress = (DWORD_PTR)ExceptionInfo->ExceptionRecord->ExceptionInformation[1];
if (in) {
printf("faultingAddress :%x\n", faultingAddress);
printf("[Enter shellcode segment] EIP:%X offset:%x\n", previousEip, EIPoffset);
encprocent();
if (mbi.Protect == PAGE_NOACCESS) {
//VirtualProtect(shellcode, shellcodeSize, PAGE_EXECUTE_READWRITE, &oldProtect);
printf("[%s]Modify the shellcode memory attribute to PAGE_EXECUTE_READWRITE\n", VirtualProtect(shellcode, shellcodeSize, PAGE_EXECUTE_READWRITE, &oldProtect) ? "+" : "-");
operateShellcode(DECRYPT, SHELLCODE, previousEip);
operateOPMEMADDR();
}
else {
VirtualProtect(shellcode, shellcodeSize, PAGE_EXECUTE_READWRITE, &oldProtect);
//printf("[%s]Modify the shellcode memory attribute to PAGE_EXECUTE_READWRITE\n", VirtualProtect(shellcode, shellcodeSize, PAGE_EXECUTE_READWRITE, &oldProtect) ? "+" : "-");
}
ExceptionInfo->ContextRecord->EFlags |= 0x100;
return EXCEPTION_CONTINUE_EXECUTION;
}
else if (faultingAddress >= shellcode_start && faultingAddress <= shellcode_end) {
printf("External access to :%x\n", faultingAddress);
//VirtualProtect(shellcode, shellcodeSize, PAGE_READWRITE, &oldProtect);
printf("[%s]Modify the shellcode memory attribute to PAGE_READWRITE\n", VirtualProtect(shellcode, shellcodeSize, PAGE_READWRITE, &oldProtect) ? "+" : "-");
//if (faultingAddress - shellcode_start == 0x1cc) {
// debug = true;
//}
operateShellcode(DECRYPT, MEMAddr,faultingAddress);
//operateShellcode(DECRYPT, 0, shellcodeSize, dynamic_xor_key);
ExceptionInfo->ContextRecord->EFlags |= 0x100;
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
if (ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_SINGLE_STEP) {
if (in) {
//innum++;
//if (c1 != shellcode[0xf]) {
// printf("0xF :%x\npEIP:%x\n", shellcode[0xf], mypreviousEip);
// for (size_t i = 0; i < 15; i++)
// {
// printf("\\x%02x", shellcode[mypreviousEip-shellcode_start+i] ^ dynamic_xor_key);
// }
// printf("\n");
// printf("%x\n", ExceptionInfo->ContextRecord->Ebp-0x8);
// printf("ecx:%x\n", ExceptionInfo->ContextRecord->Ecx);
// char fileName[20];
// sprintf(fileName, "Out_%x.bin", previousEip);
// printf("[Exit shellcode segment] EIP:%x\n", previousEip);
// saveShellcodeToFile(fileName, shellcode, shellcodeSize);
// c1 = shellcode[0xf];
//}
ExceptionInfo->ContextRecord->EFlags |= 0x100;
}
else {
//outnum++;
if (mbi.Protect != PAGE_NOACCESS) {
//VirtualProtect(shellcode, shellcodeSize, PAGE_NOACCESS, &oldProtect);
printf("[%s]Modify the shellcode memory attribute to PAGE_NOACCESS\n", VirtualProtect(shellcode, shellcodeSize, PAGE_NOACCESS, &oldProtect) ? "+" : "-");
encprocent();
}
}
return EXCEPTION_CONTINUE_EXECUTION;
}
if (ExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_HEAP_CORRUPTION) {
printf("Caught STATUS_HEAP_CORRUPTION exception!\n");
printf("Exception Address: %p\n", ExceptionInfo->ExceptionRecord->ExceptionAddress);
printf("Exception Code: 0x%08x\n", ExceptionInfo->ExceptionRecord->ExceptionCode);
printf("Exception Record:\n");
printf(" Number of Parameters: %lu\n", ExceptionInfo->ExceptionRecord->NumberParameters);
for (ULONG i = 0; i < ExceptionInfo->ExceptionRecord->NumberParameters; i++) {
printf(" Parameter[%lu]: 0x%p\n", i, (PVOID)ExceptionInfo->ExceptionRecord->ExceptionInformation[i]);
}
return EXCEPTION_CONTINUE_SEARCH;
}
return EXCEPTION_CONTINUE_SEARCH;
}
int HandleException(EXCEPTION_POINTERS* ExceptionInfo) {
printf("Exception code: 0x%08X\n", ExceptionInfo->ExceptionRecord->ExceptionCode);
printf("Exception address: 0x%p\n", ExceptionInfo->ExceptionRecord->ExceptionAddress);
return EXCEPTION_EXECUTE_HANDLER;
}
PVOID exceptionHandler = nullptr;
void Xor() {
for (size_t i = 0; i < shellcodeSize; i++)
{
shellcode[i] ^= dynamic_xor_key;
}
}
void main() {
std::ifstream file("182558101486960647.bin", std::ios::binary); // 以二进制模式打开文件
if (!file) {
std::cerr << "无法打开文件" << std::endl;
}
std::vector<unsigned char> data((std::istreambuf_iterator<char>(file)), (std::istreambuf_iterator<char>()));
file.close(); // 关闭文件
unsigned char* shellcode_calc = new unsigned char[data.size()];
std::copy(data.begin(), data.end(), shellcode_calc);
shellcodeSize = data.size();
shellcode = (unsigned char*)VirtualAlloc(NULL, shellcodeSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
original_shellcode = (unsigned char*)malloc(shellcodeSize);
memcpy(shellcode, shellcode_calc, shellcodeSize);
changeOffset = (bool*)malloc(shellcodeSize * sizeof(bool));
memset(changeOffset, 0, shellcodeSize * sizeof(bool));
if (isxor) {
Xor();
}
memcpy(original_shellcode, shellcode, shellcodeSize);
exceptionHandler = AddVectoredExceptionHandler(1, ExceptionHandler);
void (*a)() = (void (*)())shellcode;
a();
//__try {
// a();
//}
//__except (HandleException(GetExceptionInformation())) {}
// 释放资源
// 解除异常处理程序
if (exceptionHandler != nullptr) {
RemoveVectoredExceptionHandler(exceptionHandler);
}
free(changeOffset);
free(original_shellcode);
VirtualFree(shellcode, 0, MEM_RELEASE);
}
//if (ischangeEIP) {
// ischangeEIP = false;
// for (SIZE_T i = 0; i < shellcodeSize; ++i) {
// if (shellcode[i] != original_shellcode[i]) {
// printf("previousEipOffset:%x Shellcode fix offset: %x, original: 0x%02X, new: 0x%02X\n", mypreviousEip - shellcode_start, i, original_shellcode[i], shellcode[i]);
// original_shellcode[i] = shellcode[i];
// }
// }
//}
//else {
// for (SIZE_T i = 0; i < shellcodeSize; ++i) {
// if (shellcode[i] != original_shellcode[i]) {
// if (!(mypreviousEip >= shellcode_start && mypreviousEip < shellcode_end)) {
// printf("GGGG\n");
// }
// printf("previousEipOffset:%x Shellcode modified at offset: %x, original: 0x%02X, new: 0x%02X\n", mypreviousEip - shellcode_start, i, original_shellcode[i], shellcode[i]);
// shellcode[i] = original_shellcode[i] ^ dynamic_xor_key;
// encryptOffset[i] = false;
// ischangeEIP = true;
// ExceptionInfo->ContextRecord->Eip = mypreviousEip;
// previousEip = mypreviousEip;
// EIPoffset = ExceptionInfo->ContextRecord->Eip - shellcode_start;
// }
// }
//}