mirror of
https://github.com/mandiant/capa.git
synced 2025-12-07 13:20:36 -08:00
3cd97ae9f2
Replace the header from source code files using the following script:
```Python
for dir_path, dir_names, file_names in os.walk("capa"):
for file_name in file_names:
# header are only in `.py` and `.toml` files
if file_name[-3:] not in (".py", "oml"):
continue
file_path = f"{dir_path}/{file_name}"
f = open(file_path, "rb+")
content = f.read()
m = re.search(OLD_HEADER, content)
if not m:
continue
print(f"{file_path}: {m.group('year')}")
content = content.replace(m.group(0), NEW_HEADER % m.group("year"))
f.seek(0)
f.write(content)
```
Some files had the copyright headers inside a `"""` comment and needed
manual changes before applying the script. `hook-vivisect.py` and
`pyinstaller.spec` didn't include the license in the header and also
needed manual changes.
The old header had the confusing sentence `All rights reserved`, which
does not make sense for an open source license. Replace the header by
the default Google header that corrects this issue and keep capa
consistent with other Google projects.
Adapt the linter to work with the new header.
Replace also the copyright text in the `web/public/index.html` file for
consistency.
134 lines
4.3 KiB
Python
134 lines
4.3 KiB
Python
#!/usr/bin/env python3
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# Copyright 2021 Google LLC
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#
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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
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# 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
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# limitations under the License.
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"""
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match-function-id
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Show the names of functions as recognized by the function identification subsystem.
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This can help identify library functions statically linked into a program,
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such as when triaging false positive matches in capa rules.
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Example::
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$ python scripts/match-function-id.py --signature sigs/vc6.pat.gz /tmp/suspicious.dll_
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0x44cf30: ?GetPdbDll@@YAPAUHINSTANCE__@@XZ
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0x44bb20: ?_strlen_priv@@YAIPBD@Z
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0x44b6b0: ?invoke_main@@YAHXZ
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0x44a5d0: ?find_pe_section@@YAPAU_IMAGE_SECTION_HEADER@@QAEI@Z
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0x44a690: ?is_potentially_valid_image_base@@YA_NQAX@Z
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0x44cbe0: ___get_entropy
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0x44a4a0: __except_handler4
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0x44b3d0: ?pre_cpp_initialization@@YAXXZ
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0x44b2e0: ?pre_c_initialization@@YAHXZ
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0x44b3c0: ?post_pgo_initialization@@YAHXZ
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0x420156: ?
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0x420270: ?
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0x430dcd: ?
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0x44d930: __except_handler4_noexcept
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0x41e960: ?
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0x44a1e0: @_RTC_AllocaHelper@12
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0x44ba90: ?_getMemBlockDataString@@YAXPAD0PBDI@Z
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0x44a220: @_RTC_CheckStackVars2@12
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0x44a790: ___scrt_dllmain_after_initialize_c
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0x44a7d0: ___scrt_dllmain_before_initialize_c
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0x44a800: ___scrt_dllmain_crt_thread_attach
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0x44a860: ___scrt_dllmain_exception_filter
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0x44a900: ___scrt_dllmain_uninitialize_critical
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0x44ad10: _at_quick_exit
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0x44b940: ?_RTC_Failure@@YAXPAXH@Z
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0x44be60: __RTC_UninitUse
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0x44bfd0: __RTC_GetErrDesc
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0x44c060: __RTC_SetErrorType
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0x44cb60: ?
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0x44cba0: __guard_icall_checks_enforced
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"""
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import sys
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import logging
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import argparse
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import flirt
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import viv_utils
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import viv_utils.flirt
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import capa.main
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import capa.rules
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import capa.engine
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import capa.helpers
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import capa.features
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import capa.features.freeze
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from capa.loader import BACKEND_VIV
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logger = logging.getLogger("capa.match-function-id")
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def main(argv=None):
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if argv is None:
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argv = sys.argv[1:]
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parser = argparse.ArgumentParser(description="FLIRT match each function")
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capa.main.install_common_args(parser, wanted={"input_file", "signatures", "format"})
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parser.add_argument(
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"-F",
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"--function",
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type=lambda x: int(x, 0x10),
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help="match a specific function by VA, rather than add functions",
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)
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args = parser.parse_args(args=argv)
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try:
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capa.main.handle_common_args(args)
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capa.main.ensure_input_exists_from_cli(args)
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input_format = capa.main.get_input_format_from_cli(args)
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sig_paths = capa.main.get_signatures_from_cli(args, input_format, BACKEND_VIV)
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except capa.main.ShouldExitError as e:
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return e.status_code
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analyzers = []
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for sigpath in sig_paths:
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sigs = viv_utils.flirt.load_flirt_signature(str(sigpath))
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with capa.main.timing("flirt: compiling sigs"):
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matcher = flirt.compile(sigs)
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analyzer = viv_utils.flirt.FlirtFunctionAnalyzer(matcher, str(sigpath))
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logger.debug("registering viv function analyzer: %s", repr(analyzer))
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analyzers.append(analyzer)
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vw = viv_utils.getWorkspace(str(args.input_file), analyze=True, should_save=False)
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functions = vw.getFunctions()
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if args.function:
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functions = [args.function]
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seen = set()
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for function in functions:
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logger.debug("matching function: 0x%04x", function)
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for analyzer in analyzers:
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viv_utils.flirt.match_function_flirt_signatures(analyzer.matcher, vw, function)
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name = viv_utils.get_function_name(vw, function)
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if name:
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key = (function, name)
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if key in seen:
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continue
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else:
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print(f"0x{function:04x}: {name}")
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seen.add(key)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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