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main.py
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from __future__ import print_function
from unicorn import *
from x86_const import *
import binascii
from keystone import *
from capstone import *
import argparse
# Create a global list of mu
mu_dict = {
"UC_X86_REG_EAX": 0x00000000,
"UC_X86_REG_EBX": 0x00000000,
"UC_X86_REG_ECX": 0x00000000,
"UC_X86_REG_EDX": 0x00000000,
"UC_X86_REG_ESI": 0x00000000,
"UC_X86_REG_EDI": 0x00000000,
"UC_X86_REG_ESP" : 0x00000000,
"UC_X86_REG_EBP": 0x00000000,
"UC_X86_REG_EIP": 0x00000000,
"UC_X86_REG_EFLAGS": 0x00000000}
ks_syntax = ""
# print status flags
# print status flags
def print_flags(r_eflags):
#r_eflags = mu.reg_read(UC_X86_REG_EFLAGS)
string_flags = ('{0:016b}'.format(r_eflags))
string_flags = string_flags[::-1]
# print(string_flags)
print("Flags")
print("- Carry Flag: {}".format(string_flags[UC_X86_INS_CF]))
print("- Parity Flag: {}".format(string_flags[UC_X86_INS_PF]))
print("- Auxiliary Carry Flag: {}".format(string_flags[UC_X86_INS_AF]))
print("- Zero Flag: {}".format(string_flags[UC_X86_INS_ZF]))
print("- Sign Flag: {}".format(string_flags[UC_X86_INS_SF]))
#print(">>> Overflow Flag: {}".format(string_flags[UC_X86_INS_OF]))
# print(">>> Trap Flag: {}".format(string_flags[UC_X86_INS_TF]))
# print(">>> Interrupt Enable Flag: {}".format(string_flags[UC_X86_INS_IF]))
# print(">>> Direction Flag: {}".format(string_flags[UC_X86_INS_DF]))
print(">>> Overflow Flag: {}".format(string_flags[UC_X86_INS_OF]))
# print(">>> Nested Task Flag: {}".format(string_flags[UC_X86_INS_NT]))
# print(">>> Resume Flag: {}".format(string_flags[UC_X86_INS_RF]))
# print(">>> Virtual 8086 Mode flag {}".format(string_flags[UC_X86_INS_VM]))
def hook_code(uc, address, size, user_data):
global mu_dict
#print("Before executing the instruction")
print(">>> Before instruction at 0x%x, instruction size = %u" %(address, size))
# get register's content
# eax
print("Registers")
eax = uc.reg_read(UC_X86_REG_EAX)
print("- EAX = 0x%08x (%d)" %(eax, int(eax)))
ebx = uc.reg_read(UC_X86_REG_EBX)
print("- EBX = 0x%08x (%d)" %(ebx, int(ebx)))
ecx = uc.reg_read(UC_X86_REG_ECX)
print("- ECX = 0x%08x (%d)" %(ecx, int(ecx)))
# edx
edx = uc.reg_read(UC_X86_REG_EDX)
print("- EDX = 0x%08x (%d)" %(edx, int(edx)))
# esi
esi = uc.reg_read(UC_X86_REG_ESI)
print("- ESI = 0x%08x (%d)" %(esi, int(esi)))
# edi
edi = uc.reg_read(UC_X86_REG_EDI)
print("- EDI = 0x%08x (%d)" %(edi, int(edi)))
# esp
esp = uc.reg_read(UC_X86_REG_ESP)
print("- ESP = 0x%08x (%d)" %(esp, int(esp)))
# ebp
ebp = uc.reg_read(UC_X86_REG_EBP)
print("- EBP= 0x%08x (%d)" %(ebp, int(ebp)))
# eflags
eflags = uc.reg_read(UC_X86_REG_EFLAGS)
print("- EFLAGS = 0x%08x (%d)" %(eflags, int(eflags)))
# eflags
eip = uc.reg_read(UC_X86_REG_EIP)
print("- EIP = 0x%08x (%d)" %(eip, int(eip)))
print_flags(mu_dict["UC_X86_REG_EFLAGS"])
#print_flags(uc)
def assemble(CODE):
global ks_syntax
try:
ks = Ks(KS_ARCH_X86, KS_MODE_32)
if(ks_syntax == "KS_OPT_SYNTAX_ATT"):
ks.syntax = KS_OPT_SYNTAX_ATT
encoding, count = ks.asm(CODE)
print("Instruction: %s = %s (number of statements: %u)" % (CODE, encoding, count))
return encoding
except KsError as e:
print("ERROR: %s" %e)
def binarize(code_string):
encoding = assemble(code_string)
sample = binascii.hexlify(bytearray(encoding))
# print("Sample:", sample)
sample = binascii.a2b_hex(sample)
return sample
def populate_registers(mu):
# initialize machine registers
mu.reg_write(UC_X86_REG_EAX, 0x00000000)
mu.reg_write(UC_X86_REG_EBX, 0x00000000)
mu.reg_write(UC_X86_REG_ECX, 0x00000000)
mu.reg_write(UC_X86_REG_EDX, 0x00000000)
mu.reg_write(UC_X86_REG_EFLAGS, 0xFFFF)
def update_registers(mu):
global mu_dict
mu_dict["UC_X86_REG_EAX"] = mu.reg_read(UC_X86_REG_EAX)
mu_dict["UC_X86_REG_EBX"] = mu.reg_read(UC_X86_REG_EBX)
mu_dict["UC_X86_REG_ECX"] = mu.reg_read(UC_X86_REG_ECX)
mu_dict["UC_X86_REG_EDX"] = mu.reg_read(UC_X86_REG_EDX)
mu_dict["UC_X86_REG_ESI"] = mu.reg_read(UC_X86_REG_ESI)
mu_dict["UC_X86_REG_EDI"] = mu.reg_read(UC_X86_REG_EDI)
mu_dict["UC_X86_REG_ESP"] = mu.reg_read(UC_X86_REG_ESP)
mu_dict["UC_X86_REG_EBP"] = mu.reg_read(UC_X86_REG_EBP)
mu_dict["UC_X86_REG_EIP"] = mu.reg_read(UC_X86_REG_EIP)
mu_dict["UC_X86_REG_EFLAGS"] = mu.reg_read(UC_X86_REG_EFLAGS)
def emulate(sample):
# memory address where emulation starts
ADDRESS = 0x1000000
md = Cs(CS_ARCH_X86, CS_MODE_32)
mu = Uc(UC_ARCH_X86, UC_MODE_32)
# map 2MB memory for this emulation
mu.mem_map(ADDRESS, 2 * 1024 * 1024)
# code_32 = b"\x0c\x01"
# write machine code to be emulated to memory
mu.mem_write(ADDRESS, sample)
#populate_registers(mu)
mu.reg_write(UC_X86_REG_EAX, mu_dict["UC_X86_REG_EAX"])
mu.reg_write(UC_X86_REG_EBX, mu_dict["UC_X86_REG_EBX"])
mu.reg_write(UC_X86_REG_ECX, mu_dict["UC_X86_REG_ECX"])
mu.reg_write(UC_X86_REG_EDX, mu_dict["UC_X86_REG_EDX"])
mu.reg_write(UC_X86_REG_ESI, mu_dict["UC_X86_REG_ESI"])
mu.reg_write(UC_X86_REG_EDI, mu_dict["UC_X86_REG_EDI"])
mu.reg_write(UC_X86_REG_ESP, mu_dict["UC_X86_REG_ESP"])
mu.reg_write(UC_X86_REG_EBP, mu_dict["UC_X86_REG_EBP"])
mu.reg_write(UC_X86_REG_EIP, mu_dict["UC_X86_REG_EIP"])
mu.reg_write(UC_X86_REG_EFLAGS, mu_dict["UC_X86_REG_EFLAGS"])
mu.hook_add(UC_HOOK_CODE, hook_code)
# setup stack
mu.reg_write(UC_X86_REG_ESP, ADDRESS + 0x2000)
try:
# emulate machine code in infinite time
mu.emu_start(ADDRESS, ADDRESS + len(sample))
except UcError as e:
#print("ERROR: %s" % e)
pass
return mu
def print_registers(mu):
global mu_dict
print(">>> After executing the instrution")
eax = mu_dict["UC_X86_REG_EAX"]
print("- EAX = 0x%08x (%d)" %(eax,int(eax)))
ebx = mu_dict["UC_X86_REG_EBX"]
print("- EBX = 0x%08x (%d)" %(ebx, int(ebx)))
ecx = mu_dict["UC_X86_REG_ECX"]
print("- ECX = 0x%08x (%d)" % (ecx, int(ecx)))
edx = mu_dict["UC_X86_REG_EDX"]
print("- EDX = 0x%08x (%d)" %(edx, int(edx)))
esp = mu_dict["UC_X86_REG_ESP"]
print("- ESP = 0x%08x (%d)" % (esp, int(esp)))
ebp = mu_dict["UC_X86_REG_EBP"]
print("- EBP = 0x%08x (%d)" % (ebp, int(ebp)))
eip = mu_dict["UC_X86_REG_EIP"]
print("- EIP = 0x%08x (%d)" % (eip, int(eip)))
esi = mu_dict["UC_X86_REG_ESI"]
print("- ESI = 0x%08x (%d)" % (esi, int(esi)))
edi = mu_dict["UC_X86_REG_EDI"]
print("- EDI = 0x%08x (%d)" % (edi, int(edi)))
eflags = mu_dict["UC_X86_REG_EFLAGS"]
print("- EFLAGS = 0x%08x (%d)" % (eflags, int(eflags)))
print_flags(eflags)
def parse_arguments():
parser = argparse.ArgumentParser(description='A tool for learning assembly code.')
parser.add_argument('-c', action="store", dest='code_string', default='',
help='Supply code to emulate')
parser.add_argument('-syntax', action="store", dest='syntax', default='',
help='Set syntax')
return parser.parse_args()
def main():
global ks_syntax
arguments = parse_arguments()
#CODE = b"mov ax, 3; mov cx, 3; cmp cx, ax"
code = arguments.code_string
code_string = code.split(';')
syntax = arguments.syntax
if(syntax == "att"):
ks_syntax = "KS_OPT_SYNTAX_ATT"
print("AT&T Syntax")
for cs in code_string:
sample = binarize(cs)
# print_registers(mu)
mu = emulate(sample)
#print_registers(mu)
# print_flags(mu)
update_registers(mu)
print_registers(mu)
#print_stack(mu)
if __name__ == '__main__':
main()