Created
January 29, 2020 12:39
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import cutter; | |
import re; | |
cutter.cmd('aa') | |
decode_func_addr = 0x00401210 | |
cutter.cmd("s %d" % decode_func_addr ) | |
func_info = cutter.cmdj("afij") | |
func_size = func_info[0]['size'] | |
print("Function size %d" % func_size) | |
line = decode_func_addr | |
for i in range(func_size): | |
obj = cutter.cmdj("pdj 1 @ %s" % hex(line)) | |
opcode =obj[0]['opcode'] | |
match_object = re.search(r'^mov dword \[(.*)\], eax$', opcode, flags=re.IGNORECASE) | |
if match_object: | |
decoded_addr = match_object.group(1) | |
tmp = cutter.cmdj("pdj -3 @ %s" % hex(line)) | |
match_object = re.search(r'^push (.*?)$', tmp[0]['opcode'], flags=re.IGNORECASE) | |
if match_object: | |
str_addr = match_object.group(1) | |
#get zero terminated string at addr | |
tmp = cutter.cmdj("pszj @ %s" % str_addr) | |
decoded_str = tmp['string'] | |
print("%s %s" % (decoded_addr, decoded_str)) | |
#add comments to all references to decoded_addr | |
for xref in cutter.cmdj('axtj %s' % decoded_addr): | |
if re.match(r"call *", xref['opcode']): | |
# Add comments to each call of the decryption function | |
cutter.cmd('CCu CALL %s @ %d' % (decoded_str, xref['from'])) | |
line = line + 0x1 | |
cutter.refresh() |
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