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https://github.com/mandiant/capa.git
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94 lines
3.3 KiB
Python
94 lines
3.3 KiB
Python
# Copyright (C) 2020 Mandiant, Inc. All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at: [package root]/LICENSE.txt
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# Unless required by applicable law or agreed to in writing, software distributed under the License
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# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and limitations under the License.
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import abc
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import capa.render.utils
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from capa.features.common import Feature
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class API(Feature):
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def __init__(self, name: str, description=None):
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super(API, self).__init__(name, description=description)
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class Number(Feature):
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def __init__(self, value: int, description=None):
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super(Number, self).__init__(value, description=description)
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def get_value_str(self):
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return capa.render.utils.hex(self.value)
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# max recognized structure size (and therefore, offset size)
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MAX_STRUCTURE_SIZE = 0x10000
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class Offset(Feature):
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def __init__(self, value: int, description=None):
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super(Offset, self).__init__(value, description=description)
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def get_value_str(self):
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return capa.render.utils.hex(self.value)
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class Mnemonic(Feature):
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def __init__(self, value: str, description=None):
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super(Mnemonic, self).__init__(value, description=description)
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# max number of operands to consider for a given instrucion.
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# since we only support Intel and .NET, we can assume this is 3
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# which covers cases up to e.g. "vinserti128 ymm0,ymm0,ymm5,1"
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MAX_OPERAND_COUNT = 4
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MAX_OPERAND_INDEX = MAX_OPERAND_COUNT - 1
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class _Operand(Feature, abc.ABC):
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# superclass: don't use directly
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# subclasses should set self.name and provide the value string formatter
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def __init__(self, index: int, value: int, description=None):
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super(_Operand, self).__init__(value, description=description)
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self.index = index
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def __hash__(self):
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return hash((self.name, self.value))
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def __eq__(self, other):
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return super().__eq__(other) and self.index == other.index
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def freeze_serialize(self):
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return (self.__class__.__name__, [self.index, self.value])
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class OperandNumber(_Operand):
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# cached names so we don't do extra string formatting every ctor
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NAMES = ["operand[%d].number" % i for i in range(MAX_OPERAND_COUNT)]
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# operand[i].number: 0x12
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def __init__(self, index: int, value: int, description=None):
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super(OperandNumber, self).__init__(index, value, description=description)
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self.name = self.NAMES[index]
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def get_value_str(self) -> str:
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assert isinstance(self.value, int)
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return capa.render.utils.hex(self.value)
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class OperandOffset(_Operand):
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# cached names so we don't do extra string formatting every ctor
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NAMES = ["operand[%d].offset" % i for i in range(MAX_OPERAND_COUNT)]
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# operand[i].offset: 0x12
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def __init__(self, index: int, value: int, description=None):
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super(OperandOffset, self).__init__(index, value, description=description)
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self.name = self.NAMES[index]
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def get_value_str(self) -> str:
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assert isinstance(self.value, int)
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return capa.render.utils.hex(self.value)
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