62 lines
1.3 KiB
Python
62 lines
1.3 KiB
Python
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#!/usr/bin/python
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from unicorn import *
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from unicorn.x86_const import *
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from capstone import *
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ESP = 0x2000
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PAGE_SIZE = 2 * 1024 * 1024
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# mov [esp], DWORD 0x37f
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# fldcw [esp]
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# fnop
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# fnstenv [esp + 8]
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# pop ecx
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CODE = "C704247F030000D92C24D9D0D974240859".decode('hex')
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class SimpleEngine:
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def __init__(self):
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self.capmd = Cs(CS_ARCH_X86, CS_MODE_64)
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def disas_single(self, data):
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for i in self.capmd.disasm(data, 16):
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print("\t%s\t%s" % (i.mnemonic, i.op_str))
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break
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disasm = SimpleEngine()
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def hook_code(uc, addr, size, user_data):
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mem = uc.mem_read(addr, size)
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print(" 0x%X:" % (addr)),
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disasm.disas_single(str(mem))
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def mem_reader(addr, size):
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tmp = mu.mem_read(addr, size)
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for i in tmp:
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print(" 0x%x" % i),
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print("")
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mu = Uc(UC_ARCH_X86, UC_MODE_64)
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mu.mem_map(0x0, PAGE_SIZE)
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mu.mem_write(0x4000, CODE)
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mu.reg_write(UC_X86_REG_RSP, ESP)
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mu.hook_add(UC_HOOK_CODE, hook_code)
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mu.emu_start(0x4000, 0, 0, 5)
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rsp = mu.reg_read(UC_X86_REG_RSP)
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print("Value of FPIP: [0x%X]" % (rsp + 10))
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mem_reader(rsp + 10, 8)
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# EXPECTED OUTPUT:
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# 0x4000: mov dword ptr [rsp], 0x37f
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# 0x4007: fldcw word ptr [rsp]
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# 0x400A: fnop
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# 0x400C: fnstenv dword ptr [rsp + 8]
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# 0x4010: pop rcx
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# Value of FPIP: [0x2012]
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# 0x0 0x0 0xa 0x40 0x0 0x0 0x0 0x0
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# WHERE: the value of FPIP should be the address of fnop
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