Created
March 23, 2017 12:37
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def decrypt_n_comment(func, func_name): | |
""" | |
Decryption of Satan string | |
""" | |
for xref in XrefsTo(LocByName(func_name)): | |
# init retrieve arguments | |
index_ea = search_inst(xref.frm, "push") | |
index_op = GetOperandValue(index_ea, 0) | |
buf = Appcall.buffer("\x00" * 512) | |
# Call Satan's func | |
res = func(index_op, buf) | |
try: | |
# Add comments | |
MakeComm(xref.frm, "index[0x{:X}] : '{:s}'".format(index_op, buf.value.decode("utf-16").rstrip('\x00\x00'))) | |
except: | |
continue | |
def search_inst(ea, inst): | |
""" | |
Find first instruction before the given ea | |
""" | |
while True: | |
if GetMnem(ea) == inst: | |
return ea | |
ea = PrevHead(ea) | |
# Initialization ------------------------------------------ | |
FUNC_NAME = "get_string" | |
PROTO = "int __usercall {:s}@<eax>(WORD index@<ecx>, PCHAR buf@<edx>);".format(FUNC_NAME) | |
# Execution ----------------------------------------------- | |
decrypt_function = Appcall.proto(FUNC_NAME, PROTO) | |
decrypt_n_comment(decrypt_function, FUNC_NAME) |
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