mirror of
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69 lines
2.9 KiB
Python
69 lines
2.9 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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from __future__ import annotations
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from typing import List, Tuple, Iterator
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import dnfile
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from dncil.clr.token import Token
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import capa.features.extractors
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import capa.features.extractors.dnfile.file
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import capa.features.extractors.dnfile.insn
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from capa.features.common import Feature
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from capa.features.address import Address, DNTokenAddress, DNTokenOffsetAddress, AbsoluteVirtualAddress
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from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor
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from capa.features.extractors.dnfile.helpers import get_dotnet_managed_method_bodies
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class DnfileFeatureExtractor(FeatureExtractor):
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def __init__(self, path: str):
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super(DnfileFeatureExtractor, self).__init__()
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self.pe: dnfile.dnPE = dnfile.dnPE(path)
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# pre-compute these because we'll yield them at *every* scope.
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self.global_features: List[Tuple[Feature, Address]] = []
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self.global_features.extend(capa.features.extractors.dotnetfile.extract_file_os(pe=self.pe))
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self.global_features.extend(capa.features.extractors.dotnetfile.extract_file_arch(pe=self.pe))
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def get_base_address(self):
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return AbsoluteVirtualAddress(0x0)
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def extract_global_features(self):
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yield from self.global_features
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def extract_file_features(self):
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yield from capa.features.extractors.dnfile.file.extract_features(self.pe)
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def get_functions(self) -> Iterator[FunctionHandle]:
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for token, f in get_dotnet_managed_method_bodies(self.pe):
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yield FunctionHandle(address=DNTokenAddress(Token(token)), inner=f, ctx={"pe": self.pe})
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def extract_function_features(self, f):
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# TODO
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yield from []
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def get_basic_blocks(self, f) -> Iterator[BBHandle]:
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# each dotnet method is considered 1 basic block
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yield BBHandle(
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address=f.address,
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inner=f.inner,
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)
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def extract_basic_block_features(self, fh, bbh):
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# we don't support basic block features
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yield from []
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def get_instructions(self, fh, bbh):
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for insn in bbh.inner.instructions:
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yield InsnHandle(address=DNTokenOffsetAddress(bbh.address.token, insn.offset - fh.inner.offset), inner=insn)
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def extract_insn_features(self, fh, bbh, ih) -> Iterator[Tuple[Feature, Address]]:
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yield from capa.features.extractors.dnfile.insn.extract_features(fh, bbh, ih)
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