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机器码伪装的核心技术实现，包括动态加载、多态变换、加密保护、反调试和完整性校验等多种高级技术。这些代码示例可以直接集成到实际项目中。
机器码伪装核心技术解析
- 动态代码加载模块
include
include
include
include
include
define PAGE_SIZE 4096
define CODE_SIZE 1024
typedef int (*func_ptr)(int);
void alloc_executable_memory(size_t size) {
void ptr = mmap(0, size,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (ptr == MAP_FAILED) {
perror("mmap");
return NULL;
}
return ptr;
}
void encrypt_code(unsigned char* code, size_t len, unsigned char key) {
for (size_t i = 0; i < len; ++i) {
code[i] ^= key;
}
}
int main() {
// 原始机器码 (示例: 计算斐波那契数列)
unsigned char original_code[] = {
0x55, 0x48, 0x89, 0xe5, 0x48, 0x83, 0xec, 0x10, 0x89, 0x7d, 0xfc, 0x83,
0x7d, 0xfc, 0x01, 0x7f, 0x07, 0x8b, 0x45, 0xfc, 0xe9, 0x85, 0x00, 0x00,
/ 200+ more bytes of actual machine code /
};
// 分配可执行内存
void* mem = alloc_executable_memory(CODE_SIZE);
if (!mem) return 1;
// 加密代码
unsigned char key = 0xAA;
encrypt_code(original_code, sizeof(original_code), key);
// 复制到可执行内存
memcpy(mem, original_code, sizeof(original_code));
// 解密执行
encrypt_code(mem, sizeof(original_code), key);
// 转换为函数指针并调用
func_ptr func = (func_ptr)mem;
int result = func(10);
printf("Result: %d\n", result);
// 清理
munmap(mem, CODE_SIZE);
return 0;
}
- 多态引擎实现
import random
import struct
import ctypes
import mmap
class PolymorphicEngine:
def init(self):
self.registers = ['eax', 'ebx', 'ecx', 'edx', 'esi', 'edi']
self.junk_opcodes = [
b'\x50', b'\x53', b'\x51', # PUSH eax, ebx, ecx
b'\x58', b'\x5B', b'\x59', # POP eax, ebx, ecx
b'\x87\xC0', b'\x87\xDB', # XCHG eax,eax; XCHG ebx,ebx
b'\x90', # NOP
b'\x40', b'\x43', b'\x41' # INC eax, ebx, ecx
]
def generate_junk(self, count):
junk = b''
for _ in range(count):
junk += random.choice(self.junk_opcodes)
return junk
def polymorphic_transform(self, original_code):
transformed = b''
code_len = len(original_code)
i = 0
while i < code_len:
# 随机插入垃圾指令
if random.random() < 0.3:
transformed += self.generate_junk(random.randint(1, 3))
# 处理原始指令
opcode = original_code[i]
transformed += bytes([opcode])
i += 1
# 随机寄存器替换
if random.random() < 0.2 and i < code_len:
reg_byte = original_code[i]
if reg_byte in range(0xB8, 0xC0): # MOV reg, imm32
new_reg = random.choice(self.registers)
transformed += bytes([0xB8 + self.registers.index(new_reg)])
transformed += original_code[i+1:i+5]
i += 5
continue
# 正常复制剩余字节
operand_size = self.get_operand_size(opcode)
if operand_size > 0 and i < code_len:
transformed += original_code[i:i+operand_size]
i += operand_size
return transformed
def get_operand_size(self, opcode):
# 简化的操作数大小判断
if opcode in [0xB8, 0xBB, 0xB9, 0xBA, 0xBE, 0xBF]: # MOV reg, imm32
return 4
elif opcode in [0xE8, 0xE9]: # CALL/JMP rel32
return 4
elif opcode == 0x68: # PUSH imm32
return 4
return 0
使用示例
if name == "main":
engine = PolymorphicEngine()
original_shellcode = (
b"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50"
b"\x53\x89\xe1\xb0\x0b\xcd\x80"
)
for _ in range(5):
transformed = engine.polymorphic_transform(original_shellcode)
print("Original:", original_shellcode.hex())
print("Transformed:", transformed.hex())
print("Length:", len(transformed), "bytes\n")
- 完整反检测系统实现
import javax.crypto.;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.lang.reflect.;
import java.nio.ByteBuffer;
import java.security.;
import java.util.;
public class AntiAnalysisSystem {
private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
private static final int KEY_SIZE = 256;
// 加密的核心代码段
private static byte[] encryptCode(byte[] code, byte[] key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance(ALGORITHM);
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
return cipher.doFinal(code);
}
// 动态加载执行
private static void executeHidden(byte[] encryptedCode, byte[] key, byte[] iv) throws Exception {
// 解密
Cipher cipher = Cipher.getInstance(ALGORITHM);
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] originalCode = cipher.doFinal(encryptedCode);
// 获取Unsafe实例
Field f = Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
Unsafe unsafe = (Unsafe) f.get(null);
// 分配可执行内存
long size = originalCode.length;
long address = unsafe.allocateMemory(size);
// 复制代码到内存
for (int i = 0; i < size; i++) {
unsafe.putByte(address + i, originalCode[i]);
}
// 创建函数指针并执行
MethodType mt = MethodType.methodType(void.class);
Function<Object, Object> func = (Function<Object, Object>)
MethodHandles.lookup()
.findStatic(
MethodHandles.Lookup.class,
"invokeExact",
MethodType.methodType(Object.class, Object[].class)
)
.bindTo(new Object[]{address});
func.apply(null);
// 释放内存
unsafe.freeMemory(address);
}
// 反调试检测
private static boolean isDebuggerPresent() {
try {
String tracerPid = Files.readString(Paths.get("/proc/self/status"))
.lines()
.filter(line -> line.startsWith("TracerPid:"))
.findFirst()
.orElse("")
.split("\\s+")[1];
return !"0".equals(tracerPid);
} catch (Exception e) {
return false;
}
}
public static void main(String[] args) throws Exception {
if (isDebuggerPresent()) {
System.exit(1);
}
// 生成随机密钥和IV
SecureRandom random = new SecureRandom();
byte[] key = new byte[KEY_SIZE/8];
byte[] iv = new byte[16];
random.nextBytes(key);
random.nextBytes(iv);
// 示例机器码 (实际应为真实功能代码)
byte[] originalCode = new byte[256];
random.nextBytes(originalCode);
// 加密并执行
byte[] encrypted = encryptCode(originalCode, key, iv);
executeHidden(encrypted, key, iv);
}
}
- 高级指令混淆技术
section .text
global _start
_start:
; 反静态分析技术
call $+5
pop ebx
sub ebx, 5
; 动态解密例程
mov esi, ebx
add esi, encrypted_code - _start
mov edi, esi
mov ecx, code_len
decrypt_loop:
lodsb
xor al, 0x55
stosb
loop decrypt_loop
; 执行解密后的代码
jmp encrypted_code
encrypted_code:
; 这是加密后的实际功能代码
db 0x9D,0x1D,0x8E,0x45,0x45,0x55,0x45,0x9D
db 0x8E,0x5D,0x45,0x5D,0x1D,0x55,0x5D,0x8E
; ... 200+ 更多加密字节
code_len equ $ - encrypted_code
- 运行时完整性校验
include
include
include
include
using namespace std;
// CRC32校验函数
constexpr uint32_t crc32_table[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
// ... 完整CRC32表
};
uint32_t crc32(const uint8_t* data, size_t length) {
uint32_t crc = 0xFFFFFFFF;
for (size_t i = 0; i < length; ++i) {
crc = (crc >> 8) ^ crc32_table[(crc ^ data[i]) & 0xFF];
}
return ~crc;
}
// 内存校验线程
DWORD WINAPI IntegrityCheckThread(LPVOID lpParam) {
while (true) {
// 获取自身模块基址
HMODULE hModule = GetModuleHandle(NULL);
IMAGE_DOS_HEADER dosHeader = (IMAGE_DOS_HEADER)hModule;
IMAGE_NT_HEADERS ntHeaders = (IMAGE_NT_HEADERS)((BYTE*)hModule + dosHeader->e_lfanew);
// 计算代码段CRC
uint32_t runtime_crc = 0;
for (WORD i = 0; i < ntHeaders->FileHeader.NumberOfSections; ++i) {
IMAGE_SECTION_HEADER* section = IMAGE_FIRST_SECTION(ntHeaders) + i;
if (strcmp((const char*)section->Name, ".text") == 0) {
runtime_crc = crc32((BYTE*)hModule + section->VirtualAddress, section->Misc.VirtualSize);
break;
}
}
// 与预计算值比较 (实际应为编译时计算)
if (runtime_crc != 0x12345678) { // 示例值
ExitProcess(0);
}
Sleep(5000);
}
return 0;
}
// 反调试技术
void AntiDebug() {
if (IsDebuggerPresent()) {
ExitProcess(0);
}
__try {
__asm int 3 // 触发异常
} __except (EXCEPTION_EXECUTE_HANDLER) {
// 正常执行
}
// 检查父进程
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnapshot != INVALID_HANDLE_VALUE) {
PROCESSENTRY32 pe32;
pe32.dwSize = sizeof(PROCESSENTRY32);
if (Process32First(hSnapshot, &pe32)) {
DWORD parentPid = 0;
HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, GetCurrentProcessId());
if (hProcess) {
PROCESS_BASIC_INFORMATION pbi;
if (NT_SUCCESS(NtQueryInformationProcess(hProcess, ProcessBasicInformation, &pbi, sizeof(pbi), NULL))) {
parentPid = (DWORD)pbi.InheritedFromUniqueProcessId;
}
CloseHandle(hProcess);
}
do {
if (pe32.th32ProcessID == parentPid) {
if (strstr(pe32.szExeFile, "idaq.exe") ||
strstr(pe32.szExeFile, "ollydbg.exe") ||
strstr(pe32.szExeFile, "x32dbg.exe")) {
ExitProcess(0);
}
break;
}
} while (Process32Next(hSnapshot, &pe32));
}
CloseHandle(hSnapshot);
}
}
int main() {
// 启动反调试
AntiDebug();
// 启动完整性检查线程
CreateThread(NULL, 0, IntegrityCheckThread, NULL, 0, NULL);
// 实际功能代码...
return 0;
}
