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Update modeflattener.py #1

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25 changes: 18 additions & 7 deletions modeflattener.py
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,8 @@ def deflat(ad, func_info):
ircfg = lifter.new_ircfg_from_asmcfg(asmcfg)
ircfg_simplifier = IRCFGSimplifierCommon(lifter)
ircfg_simplifier.simplify(ircfg, addr)

#save_cfg(ircfg,'ir_%x'%addr)

# marking the instructions affecting the state variable as nop_addrs
nop_addrs = find_state_var_usedefs(ircfg, state_var)
rel_blk_info[addr] = (asmcfg, nop_addrs)
Expand All @@ -98,7 +99,7 @@ def deflat(ad, func_info):
#save_cfg(ircfg, 'ssa_%x'%addr)

# find the possible values of the state variable
var_asg, tmpval_list = find_var_asg(ircfg, {state_var})
var_asg, tmpval_list = find_var_asg(ircfg, {state_var},loc_db,mdis)
_log.debug('%#x %s' % (addr, var_asg))

# adding all the possible values to a global list
Expand All @@ -114,6 +115,8 @@ def deflat(ad, func_info):
#extracting the condition from the last 3rd line
cond_mnem = last_blk.lines[-3].name
_log.debug('cond used: %s' % cond_mnem)
if cond_mnem=='MOV':
cond_mnem = last_blk.lines[-4].name
var_asg['cond'] = cond_mnem
var_asg['true_next'] = hex(var_asg['true_next'])
var_asg['false_next'] = hex(var_asg['false_next'])
Expand Down Expand Up @@ -204,6 +207,7 @@ def deflat(ad, func_info):
parser.add_argument('filename', help="file to deobfuscate")
parser.add_argument('patch_filename', help="deobfuscated file name")
parser.add_argument('address', help="obfuscated function address")
parser.add_argument('-b',"--baseaddr", help="file base address")
parser.add_argument('-a', "--all", action="store_true",
help="find and deobfuscate all flattened functions recursively")
parser.add_argument('-l', "--log", help="logging level (default=INFO)",
Expand Down Expand Up @@ -231,10 +235,17 @@ def deflat(ad, func_info):
if cont.arch not in supported_arch:
_log.error("Architecture unsupported : %s" % cont.arch)
exit(1)

section_ep = cont.bin_stream.bin.virt.parent.getsectionbyvad(cont.entry_point).sh
bin_base_addr = section_ep.addr - section_ep.offset
_log.info('bin_base_addr: %#x' % bin_base_addr)
try:
if args.baseaddr:
_log.info('Base Address:'+args.baseaddr)
baseaddr=int(args.baseaddr,16)
elif cont.executable.isPE():
baseaddr=0x400C00
_log.info('Base Address:%x'%baseaddr)
except AttributeError:
section_ep = cont.bin_stream.bin.virt.parent.getsectionbyvad(cont.entry_point).sh
baseaddr = section_ep.addr - section_ep.offset
_log.info('Base Address:%x'%baseaddr)

machine = Machine(cont.arch)
mdis = machine.dis_engine(cont.bin_stream, loc_db=loc_db)
Expand Down Expand Up @@ -282,7 +293,7 @@ def deflat(ad, func_info):

if patches:
for offset, data in patches.items():
fpatch.seek(offset - bin_base_addr)
fpatch.seek(offset - baseaddr)
fpatch.write(data)

fcn_end_time = time.time() - fcn_start_time
Expand Down