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base_finder.py
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base_finder.py
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# -*- coding: utf-8 -*-
'''
[IDA-python Script]
Finding Base address of an Firmware of BES2300xx
Author:Migraine
'''
# 1. 使用IDA加载固件,选择架构为ARMv7即可
# 2. 运行脚本,将会返回固件的正确加载地址
# 查找基于RTX系统的基础地址
def RTX_base_finder():
ea = ida_ida.inf_get_min_ea() # 获取当前最小地址
software_init_hook = idc.find_binary(
ea, SEARCH_DOWN, '00 20 00 21 04 46 0D 46')
_libc_fini_array = idc.find_binary(ea, SEARCH_DOWN, '38 B5 07 4B 07 4C ')
if _libc_fini_array == 0xffffffff:
return False
_libc_fini_array_pointer = idc.get_wide_dword(
software_init_hook+0x30)-1 # 需要减1,因为存储值为libc_fini_array + 1
base = _libc_fini_array_pointer - _libc_fini_array
print("software_init_hook : addr = "+hex(software_init_hook))
print("_libc_fini_array : addr = "+hex(_libc_fini_array))
print("_libc_fini_array_pointer : addr = "+hex(_libc_fini_array_pointer))
return base
# 通用的系统基础地址计算
def Com_base_finder():
ea = ida_ida.inf_get_min_ea() # 获取当前最小地址
RfAdvanceIncomingToOpenState = idc.find_binary(
ea, SEARCH_DOWN, '49 B9 07 4B')
RfAdvanceToClosedTimeoutHandler = idc.find_binary(
ea, SEARCH_DOWN, '83 68 93 F8 71')
if RfAdvanceToClosedTimeoutHandler == 0xffffffff:
return False
RfAdvanceToClosedTimeoutHandler_pointer = idc.get_wide_dword(
RfAdvanceIncomingToOpenState+0x20)-1
base = RfAdvanceToClosedTimeoutHandler_pointer - RfAdvanceToClosedTimeoutHandler
print("RfAdvanceIncomingToOpenState : addr = " +
hex(RfAdvanceIncomingToOpenState))
print("RfAdvanceToClosedTimeoutHandler : addr = " +
hex(RfAdvanceToClosedTimeoutHandler))
print("RfAdvanceToClosedTimeoutHandler_pointer : addr = " +
hex(RfAdvanceToClosedTimeoutHandler_pointer))
return base
base = RTX_base_finder()
base2 = Com_base_finder()
if base == base2:
print("[+] BASE ADDRESS : addr = "+hex(base))
else:
if base != False:
print("[+] finding _libc_fini_array success")
print("[+] BASE ADDRESS : addr = "+hex(base))
else:
print("[-] Error finding _libc_fini_array")
if base2 != False:
print("[+] finding RfAdvanceToClosedTimeoutHandler success")
print("[+] BASE ADDRESS : addr = "+hex(base2))
else:
print("[-] Error finding RfAdvanceToClosedTimeoutHandler")
# idaapi.auto_make_code(software_init_hook) #自动生成代码