其他
跨平台模拟执行 - AndroidNativeEmu实用手册
本文为看雪论坛精华文章
看雪论坛作者ID：StriveMario
AndroidNativeEmu有什么用?
特性
模拟 JNI Invocation API so JNI_OnLoad can be called properly.
模拟 memory、malloc、memcpy
支持拦截系统调用(SVC #0)
通过符号Hook
所有 JavaVM, JNIEnv 和 hooked functions 都可以用python来处理
支持 VFP
支持文件系统（也就是说你可以模拟maps、status等文件）
项目地址：
https://github.com/AeonLucid/AndroidNativeEmu
安装过程
克隆keystone仓库: git clone https://github.com/keystone-engine/keystone.git 打开keystone\bindings文件夹安装: python setup.py install 下载对应系统和版本dll(因为我是win), 下载链接: http://www.keystone-engine.org/download/ 把dll复制到python的keystone目录下: [python_path]\Lib\site-packages\keystone\
"samples/example_binaries/libc.so"
改为
"example_binaries/libc.so"
例子文件阅读
vfs/ : 里面是虚拟的文件系统, 有需要可以自己添加文件
androidemu/ : android虚拟机
import sys
from unicorn import UC_HOOK_CODE
from unicorn.arm_const import *
from androidemu.emulator import Emulator
# 配置日志相关设置
logging.basicConfig(
stream=sys.stdout, #标准输出流
level=logging.DEBUG, #输出等级
format="%(asctime)s %(levelname)7s %(name)34s | %(message)s" #输出格式
)
logger = logging.getLogger(__name__) #实例化对象
# 实例化虚拟机
emulator = Emulator()
#加载Libc库
emulator.load_library("example_binaries/libc.so", do_init=False)
#加载要模拟器的库
lib_module = emulator.load_library("example_binaries/libnative-lib.so")
#打印已经加载的模块
logger.info("Loaded modules:")
for module in emulator.modules:
logger.info("[0x%x] %s" % (module.base, module.filename))
#trace 每步执行的指令, 方便调试, 其实也可以取消
def hook_code(mu, address, size, user_data):
instruction = mu.mem_read(address, size)
instruction_str = ''.join('{:02x} '.format(x) for x in instruction)
print('# Tracing instruction at 0x%x, instruction size = 0x%x, instruction = %s' % (address, size, instruction_str))
emulator.mu.hook_add(UC_HOOK_CODE, hook_code)
#通过导出符号来调用函数
emulator.call_symbol(lib_module, '_Z4testv')
#通过R0来获取调用结构
print("String length is: %i" % emulator.mu.reg_read(UC_ARM_REG_R0))
Demo代码
{
return a + b;
}
extern "C" JNIEXPORT jint JNICALL
Java_com_mario_testunicorn_MainActivity_myAdd(
JNIEnv* env,
jobject /*this*/,
int a,
int b){
return nativeAdd(a,b);
}
emu代码
import posixpath
import sys
from unicorn import UcError, UC_HOOK_CODE, UC_HOOK_MEM_UNMAPPED
from unicorn.arm_const import *
from androidemu.emulator import Emulator
import debug_utils
# 配置日志
logging.basicConfig(
stream=sys.stdout,
level=logging.DEBUG,
format="%(asctime)s %(levelname)7s %(name)34s | %(message)s"
)
logger = logging.getLogger(__name__)
# 初始化模拟器
emulator = Emulator(
vfp_inst_set=True,
vfs_root=posixpath.join(posixpath.dirname(__file__), "vfs")
)
# 加载依赖的动态库
emulator.load_library("example_binaries/libdl.so")
emulator.load_library("example_binaries/libc.so", do_init=False)
emulator.load_library("example_binaries/libstdc++.so")
emulator.load_library("example_binaries/libm.so")
lib_module = emulator.load_library("example_binaries/libmytest.so")
# 当前已经load的so
logger.info("Loaded modules:")
for module in emulator.modules:
logger.info("=> 0x%08x - %s" % (module.base, module.filename))
try:
# 运行jni onload 这里没有, 但不影响执行
emulator.call_symbol(lib_module, 'JNI_OnLoad', emulator.java_vm.address_ptr, 0x00)
#直接调用符号1, 计算1+2
emulator.call_symbol(lib_module, '_Z9nativeAddii', 1, 2)
print("_Z9nativeAddii result call: %i" % emulator.mu.reg_read(UC_ARM_REG_R0))
#直接调用符号2, 计算1000 + 1000
emulator.call_symbol(lib_module, 'Java_com_mario_testunicorn_MainActivity_myAdd', 0, 0, 1000, 1000)
print("myAdd result call: %i" % emulator.mu.reg_read(UC_ARM_REG_R0))
#执行完成, 退出虚拟机
logger.info("Exited EMU.")
logger.info("Native methods registered to MainActivity:")
except UcError as e:
print("Exit at %x" % emulator.mu.reg_read(UC_ARM_REG_PC))
raise
RuntimeError: Unhandled syscall x (x) at 解决
self._syscall_handler.set_handler(0xAC, "prctl", 5, self._handle_prctl)
self._syscall_handler.set_handler(0xF0, "futex", 6, self._handle_futex)
self._syscall_handler.set_handler(0x107, "clock_gettime", 2, self._handle_clock_gettime)
self._syscall_handler.set_handler(0x119, "socket", 3, self._socket)
self._syscall_handler.set_handler(0x11b, "connect", 3, self._connect)
self._syscall_handler.set_handler(0x159, "getcpu", 3, self._getcpu)
self._syscall_handler.set_handler(0x14e, "faccessat", 4, self._faccessat)
self._syscall_handler.set_handler(0x14, "getpid", 0, self._getpid)
self._syscall_handler.set_handler(0xe0, "gettid", 0, self._gettid)
self._syscall_handler.set_handler(0x180,"null1",0, self._null)
arg1: 中断号(intno),中断号可以在ndk中的unistd.h中找到
arg2: 函数名
arg3: 参数数量
arg4: 绑定的自定义函数
执行结果
实战目标
目标函数: a(char* buf, int buf_len)
返回值: return_value > 0, 表示风险环境并且会在buf参数里写入详细风险环境信息;
return_value == 0, 表示正常环境
EMU代码
import posixpath
import sys
from unicorn import UcError, UC_HOOK_CODE, UC_HOOK_MEM_UNMAPPED
from unicorn.arm_const import *
from androidemu.emulator import Emulator
from androidemu.java.java_class_def import JavaClassDef
from androidemu.java.java_method_def import java_method_def
# Create java class.
import debug_utils
# 配置日志
logging.basicConfig(
stream=sys.stdout,
level=logging.DEBUG,
format="%(asctime)s %(levelname)7s %(name)34s | %(message)s"
)
logger = logging.getLogger(__name__)
# 初始化模拟器
emulator = Emulator(
vfp_inst_set=True,
vfs_root=posixpath.join(posixpath.dirname(__file__), "vfs")
)
# 加载依赖的动态库
emulator.load_library("example_binaries/libdl.so")
emulator.load_library("example_binaries/libc.so", do_init=False)
emulator.load_library("example_binaries/libstdc++.so")
emulator.load_library("example_binaries/liblog.so")
emulator.load_library("example_binaries/libm.so")
#目标so
lib_module = emulator.load_library("example_binaries/libtest.so")
# 当前已经load的so
logger.info("Loaded modules:")
for module in emulator.modules:
logger.info("=> 0x%08x - %s" % (module.base, module.filename))
try:
# 运行jni onload 这里没有, 但不影响执行
emulator.call_symbol(lib_module, 'JNI_OnLoad', emulator.java_vm.address_ptr, 0x00)
# 增加properties, 该so或通过获取一些properties来判断环境
emulator.system_properties['ro.build.fingerprint'] = 'google/passion/passion:2.3.3/GRI40/102588:user/release-keys'
emulator.system_properties['ro.product.cpu.abi'] = 'arm'
emulator.system_properties['microvirt.vbox_dpi'] = ''
#申请一块buff, 用作参数
emulator.call_symbol(lib_module, 'malloc', 0x1000)
address = emulator.mu.reg_read(UC_ARM_REG_R0)
#在之前申请的buff读取内存
detect_str = memory_helpers.read_utf8(emulator.mu, address)
print("detect_str: " + detect_str)
#执行完成, 退出虚拟机
logger.info("Exited EMU.")
logger.info("Native methods registered to MainActivity:")
except UcError as e:
print("Exit at %x" % emulator.mu.reg_read(UC_ARM_REG_PC))
raise
过检测
2019-09-21 16:08:27,680 DEBUG androidemu.cpu.syscall_handlers | Executing syscall read(00000005, 02089000, 00000400) at 0xcbc1ba7c
2019-09-21 16:08:27,783 INFO androidemu.vfs.file_system | Reading 1024 bytes from '/proc/self/maps'
2019-09-21 16:08:27,784 DEBUG androidemu.cpu.syscall_handlers | Executing syscall close(00000008) at 0xcbc1a854
2019-09-21 16:08:27,886 INFO androidemu.vfs.file_system | File opened '/proc/self/status'
2019-09-21 16:08:27,887 DEBUG androidemu.cpu.syscall_handlers | Executing syscall fstat64(0000000a, 000ff3e8) at 0xcbc1b314
总结
看雪ID：StriveMario
https://bbs.pediy.com/user-773600.htm
推荐文章++++