106 lines
3.9 KiB
Python
106 lines
3.9 KiB
Python
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import random
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import string
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import re
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class Encoder:
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def __init__(self, helper):
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self.helper = helper
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self.default = ["var", "func", "data", "bool"]
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self.default_size = len(self.default)
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try:
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self.offset = int(helper.GetConfig("encodingoffset"))
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except:
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helper.ExitShowError("\"%s\" is not a valid encodingoffset value." % self.offset)
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def get_encoding_offset(self):
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return self.offset
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def append_vars(self, vars):
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self.default += vars
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return self
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def encode_buffer(self, buffer):
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output = ""
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for c in buffer:
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output += chr(ord(c) + int(self.offset))
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return output
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def encode_user_vars(self, buffer):
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for var in re.findall("{\[.*?\]}", buffer):
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buffer = buffer.replace(var, self.encode_buffer(self.remove_encode_tag(var)))
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return buffer
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def append_def_use_tag(self, buffer):
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for var in re.findall("\[use:.*?\]", buffer):
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buffer = buffer.replace(var, "")
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self.default.append(self.remove_def_use_tag(var))
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return buffer
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def remove_encode_tag(self, buffer):
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return buffer.replace("{[", "").replace("]}", "")
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def remove_def_use_tag(self, buffer):
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return buffer.replace("[use:", "").replace("]", "")
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def rand_vars(self, buffer):
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iterator = self.helper.GetConfig("varcount")
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count = 0
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for var in self.default:
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count += 1
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for i in reversed(range(1, iterator)):
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buffer = buffer.replace(var + str(i), self.gen_str(random.randrange(5, 25)))
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if count > self.default_size:
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buffer = buffer.replace(var, self.gen_str(random.randrange(5, 25)))
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return buffer
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def rand_smallint(self, buffer):
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return self.__rand_int(buffer, "smallint", 1, 2)
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def rand_int(self, buffer):
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return self.__rand_int(buffer, "int", 2, 5)
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def __rand_int(self, buffer, var, min, max):
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iterator = self.helper.GetConfig("varcount")
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for i in reversed(range(1, iterator)):
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buffer = buffer.replace("[" + var + str(i) + "]", self.gen_int(random.randrange(min, max)))
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return buffer
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def gen_str(self, size):
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return ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.ascii_lowercase) for _ in range(size))
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def gen_int(self, size):
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return ''.join(random.SystemRandom().choice(string.digits) for _ in range(size))
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def replace_var(self, buffer, var, data, encode=False):
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if encode:
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data = self.encode_buffer(data)
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return buffer.replace("[" + var + "]", str(data))
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def chunk_payload(self, buffer, payload):
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payload = self.encode_buffer(payload)
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chunksize = int(self.helper.GetConfig("chunksize"))
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vars = "Dim " + self.gen_str(random.randrange(5, 20)) + " As String\r\n"
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args = ""
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size = 0
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for chunk in re.findall("." * chunksize, payload):
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current_var = self.gen_str(random.randrange(5, 20))
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vars += "\tDim " + current_var + " As String\r\n"
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vars += "\t" + current_var + " = \"" + chunk + "\"\r\n"
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args += current_var + " & "
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size += chunksize
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if len(payload) > size:
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current_var = self.gen_str(random.randrange(5, 20))
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vars += "\tDim " + current_var + " As String\r\n"
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vars += "\t" + current_var + " = \"" + payload[(len(payload) - size) * -1:] + "\"\r\n"
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args += current_var
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else:
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args = args[:-3]
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return buffer.replace("[payload]", vars).replace("[payload_args]", args)
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