破解Hopper Disassembler v3.7.8 for mac的艰难历程
Hopper Disassembler是一个很牛的逆向分析工具，虽然我个人觉得比不上IDA，但是聊胜于无，感觉字符处理得不错。这个工具在2.x时代是很容西xx的，但是到了3.x翅膀就硬了。
我这里xx的是最新的3.7.8，在这个版本中自我保护手段是很多的，主要是：1.无法用gdb lldb载入分析，一附加就出错退出。2、Section偏移量篡改。3、加密了__TEXT里的代码，字符串，还有objc相关的信息。这样的结果就是，无法进行动态分析，无法载入静态分析。
以下Hopper Disassembler简称hd
想破解它，首先就要修复其Section。
关于Mach-O的结构，不懂的百度一下吧。还有就是用010 Editor来编辑简直好用到不行
要修复Section，我们先分析以下内存布局，根据其布局来修复
这是otool -l输出的__TEXT Segment的信息
代码:
Load command 1
cmd LC_SEGMENT_64
cmdsize 1032
segname __TEXT
vmaddr 0x0000000100000000
vmsize 0x00000000003d1000
fileoff 0
filesize 4001792
maxprot 0x00000007
initprot 0x00000007
nsects 12
flags 0x0
主要看vmaddr 和fileoff，vmaddr是这个二进制文件加载到内存中的位置。fileoff是加载到内存里的数据在文件中得偏移量，这里是0.也就是说从头加载。
为什么要看这里呢，这是因为根据分析发现hd主要是对Section的offet进行修改，修改为任意值。Section中得offset和fileoff类似，也是指在文件中得偏移量。静态分析工具需要这个偏移量来定位一些静态信息，如果将其修改，静态分析就无法继续。还有就是修改Section对运行时是没有影响的。这样我们就得知了fileoff和vmaddr。
我们再看一下__TEXT Segment的__text Section，以下是otool -l输出的__text的信息。
代码:
Section
sectname __text
segname __TEXT
addr 0x0000000100006fa0
size 0x00000000003022ea
offset 28576
align 2^4 (16)
reloff 0
nreloc 0
flags 0x80000400
reserved1 0
reserved2 0
addr同样是这个Section在内存中的位置，offset是在文件中的偏移量。可以这么算
offset = fileoff + vmadr - addr
将offset回填就行了。
按照上面说的方法，逐一修正所有的Section就ok了。还要注意的地方就是各个Segment的大小filesize和vmsize是否相等。
至此Section的修复就算完成了。
第二步，就是恢复被加密的Section的内容。
因为无法附加调试，vm_read的动态基址获取很麻烦，于是我这里选择指定DYLD_INSERT_LIBRARIES环境变量的方式注入一个dylib，在dylib的构造方法里启动一个线程，在线程中等待运行时Section的解密完成。一旦发现解密完成之后就把解密后的内容dump到硬盘上。
代码:
/*
export DYLD_FORCE_FLAT_NAMESPACE=1
export DYLD_INSERT_LIBRARIES=~/xd.dylib
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include "pthread.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <mach/mach.h>
#include <mach/mach_init.h>
#include <mach/mach_vm.h>
mach_vm_address_t getBasicAddress(mach_port_t task){
mach_vm_size_t region_size = 0;
mach_vm_address_t region = NULL;
int ret = 0;
/* Get region boundaries */
#if defined(_MAC64) || defined(__LP64__)
vm_region_basic_info_data_64_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO_64;
if ((ret = mach_vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info,
(mach_msg_type_number_t*)&info_count, (mach_port_t*)&task)) != KERN_SUCCESS)
{
printf("mach_vm_region() message %s!\n",mach_error_string(ret));
return NULL;
}
#else
vm_region_basic_info_data_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
if ((ret = vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info,
(mach_msg_type_number_t*)&info_count, (mach_port_t*)&task)) != KERN_SUCCESS)
{
printf("vm_region() message %s!\n",mach_error_string(ret));
return NULL;
}
#endif
return region;
}
vm_size_t readRemotoMemory(char *buf,vm_size_t len,mach_port_t task,vm_address_t address)
{
vm_size_t outSize = 0;
int ret = vm_read_overwrite(task,address,len,(vm_address_t)buf,&outSize);
if (ret != 0)
{
printf("vm_read_overwrite() message %s!\n",mach_error_string(ret));
return 0;
}
return outSize;
}
//int main(int argc, char const *argv[])
void* handler(void *p)
{
//int pid = 16057;
int pid = getpid();
char buffer;
mach_vm_address_t address = 0;
mach_port_t task = 0;
int waitTime = 15;
while(waitTime){
sleep(1);
printf("thread waiting! %d\n",waitTime);
waitTime --;
}
int ret = task_for_pid(mach_task_self(),pid,&task);
if (ret != 0)
{
printf("task_for_pid() message %s!\n",mach_error_string(ret));
return NULL;
}
address = getBasicAddress(task);
printf("pid : %d\n",pid);
printf("task : %x\n", task);
printf("address : %llx\n", address);
if (address == 0)
{
printf("getBasicAddress() faild!\n");
return NULL;
}
uint32_t writeSize = 0;
FILE *fp = fopen("dump.bin","wb");
readRemotoMemory(buffer,512,task,address);
printf("%x\n",*(uint*)buffer);
while (writeSize <= 0x1F8E){
readRemotoMemory(buffer,512,task,address);
//printf("%x\n",*(uint*)buffer);
address += 512;
writeSize += writeSize;
fwrite(buffer,512,1,fp);
}
return NULL;
}
void __attribute__((constructor)) init()
{
int err;
pthread_t ntid;
err = pthread_create(&ntid, NULL, handler, NULL);
if (err != 0)
{
printf("can't create thread: %s\n", strerror(err));
return ;
}
}
这是我此次使用的dump的代码。将其编译成dylib，插入DYLD_INSERT_LIBRARIES后启动hd就行了。详细做法请看其代码。
dump出来的文件，其实就是一个解密后的二进制镜像。里面包含有解密了得Section。其文件结构也是一个mach-o文件。
这里我用010 Editor神器将dump出来的Section逐一复制粘贴到原本里hd里。我做的时候只还原了__TEXT Segment的Section，__Data Segment的没有理会。而且这样子修复后的hd，是可以运行的，只不过显示主界面大约一秒钟之后就闪退了。而且其反调试功能还在工作，还是无法动态调试。
这样就算解密完成了，经过这样的处理，就能顺利地加载到IDA分析了。
本人比较懒，有快捷的方法我也不啰嗦。因为要完全还原hd的可执行文件太麻烦，于是我这里使用运行时内存补丁来将其破解。
经过ida的分析，找到几处关键点checkRegistrationLicense，和checkRegistrationToken，然后用这里（http://malokch.xicp.net/?post=25）的工具生成补丁。
补丁的加载方式还是DYLD_INSERT_LIBRARIES插入dylib，~~太懒了没办法，补丁代码如下
代码:
/*
export DYLD_FORCE_FLAT_NAMESPACE=1
export DYLD_INSERT_LIBRARIES=~/chd.dylib
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include "pthread.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <mach/mach.h>
#include <mach/mach_init.h>
#include <mach/mach_vm.h>
#include "libkern/OSCacheControl.h"
mach_vm_address_t getBasicAddress(int pid){
mach_vm_size_t region_size = 0;
mach_vm_address_t region = 0;
mach_port_t task = 0;
int ret = 0;
ret = task_for_pid(mach_task_self(),pid,&task);
if (ret != 0)
{
printf("task_for_pid() message %s!\n",mach_error_string(ret));
return 0;
}
/* Get region boundaries */
#if defined(_MAC64) || defined(__LP64__)
vm_region_basic_info_data_64_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO_64;
if ((ret = mach_vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info,
(mach_msg_type_number_t*)&info_count, (mach_port_t*)&task)) != KERN_SUCCESS)
{
printf("mach_vm_region() message %s!\n",mach_error_string(ret));
return 0;
}
#else
vm_region_basic_info_data_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
if ((ret = vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info,
(mach_msg_type_number_t*)&info_count, (mach_port_t*)&task)) != KERN_SUCCESS)
{
printf("vm_region() message %s!\n",mach_error_string(ret));
return NULL;
}
#endif
return region;
}
vm_size_t readRemotoMemory(char *buf,vm_size_t len,int pid,vm_address_t address)
{
vm_size_t outSize = 0;
mach_port_t task = 0;
int ret = task_for_pid(mach_task_self(),pid,&task);
if (ret != 0)
{
printf("task_for_pid() message %s!\n",mach_error_string(ret));
return 0;
}
ret = vm_read_overwrite(task,address,len,(vm_address_t)buf,&outSize);
if (ret != 0)
{
printf("vm_read_overwrite() message %s!\n",mach_error_string(ret));
return 0;
}
return outSize;
}
//
int FakeCode(char *addr, char code)
{
mach_port_t task;
mach_vm_size_t region_size = 0;
mach_vm_address_t region = (vm_address_t)addr;
/* Get region boundaries */
#if defined(_MAC64) || defined(__LP64__)
vm_region_basic_info_data_64_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO_64;
if (mach_vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info, (mach_msg_type_number_t*)&info_count, (mach_port_t*)&task) != 0)
{
return 0;
}
#else
vm_region_basic_info_data_t info;
mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
if (vm_region(mach_task_self(), ®ion, ®ion_size, flavor, (vm_region_info_t)&info, (mach_msg_type_number_t*)&info_count, (mach_port_t*)&task) != 0)
{
return 0;
}
#endif
/* Change memory protections to rw- */
if (vm_protect(mach_task_self(), region, region_size, 0, VM_PROT_READ | VM_PROT_WRITE | VM_PROT_COPY) != KERN_SUCCESS)
{
//_LineLog();
return 0;
}
/* Actually perform the write */
*addr = code;
/* Flush CPU data cache to save write to RAM */
sys_dcache_flush(addr, sizeof(code));
/* Invalidate instruction cache to make the CPU read patched instructions from RAM */
sys_icache_invalidate(addr, sizeof(code));
/* Change memory protections back to r-x */
vm_protect(mach_task_self(), region, region_size, 0, VM_PROT_EXECUTE | VM_PROT_READ);
return 1;
}
//int main(int argc, char const *argv[])
void* handler(void *p)
{
//int pid = 16057;
int pid = getpid();
char buffer;
mach_vm_address_t address = 0;
address = getBasicAddress(pid);
//printf("Target pid : %d\n",pid);
//printf("Base address: %llx\n", address);
if (address == 0)
{
printf("getBasicAddress() faild!\n");
return NULL;
}
//Demo
char *demo = (char*)address + 0x329a9e;
demo = ' ';
demo = ' ';
demo = ' ';
demo = ' ';
//Demo version
char *dv = (char*)address + 0x329E8C;
dv = 'F';
dv = 'u';
dv = 'l';
dv = 'l';
//Waiting for decode __text
sleep(1);
//isreg
//*(uint16_t*)(address + 0x58b65) = 0x9090;
//*(uint16_t*)(address + 0x58b65 + 2) = 0x9090;
//*(uint16_t*)(address + 0x58b65 + 4) = 0x9090;
//checkRegistrationLicense:
//xor ebx,ebx => mov $1,%bl
//xor edi,edi => inc %edi
*(uint32_t*)(address + 0xb9b7) = 0xc7ff01b3;
//checkRegistrationToken
// xor r14d,r14d => inc r14d
*(uint8_t*)(address + 0xb974) = 0x41;
*(uint8_t*)(address + 0xb974 + 1) = 0xff;
*(uint8_t*)(address + 0xb974 + 1) = 0xc6;
return NULL;
}
void __attribute__((constructor)) init()
{
int err;
pthread_t ntid;
err = pthread_create(&ntid, NULL, handler, NULL);
if (err != 0)
{
printf("can't create thread: %s\n", strerror(err));
return ;
}
}
这样子破解可能还不完全，我也没发现哪里不能用，不过能用就是了。没有了注册窗口，没有了调试面板的限制，没有Demo的水印等。
最后打包的时候，将MacOS下的Hopper Disassembler v3重命名为Hopper Disassembler v3_，然后新建一个shell脚本，名字叫Hopper Disassembler v3，脚本代码如下
代码:
#!/bin/bash
HD_PATH="`dirname "${0}"`"
HD_BIN="`dirname "${0}"`"/Hopper\ Disassembler\ v3_
export DYLD_INSERT_LIBRARIES="${HD_PATH}/chd.dylib"
"$HD_BIN"
我这里的补丁叫chd.dylib，将其放到MacOS下就OK了。简直完美。
若有不对之处敬请指正。
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