mirror of
https://github.com/mandiant/capa.git
synced 2025-12-12 15:49:46 -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.
133 lines
3.6 KiB
Python
133 lines
3.6 KiB
Python
# Copyright 2020 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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IDA Pro script that imports a capa report,
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produced via `capa --json /path/to/sample`,
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into the current database.
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It will mark up functions with their capa matches, like:
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; capa: print debug messages (host-interaction/log/debug/write-event)
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; capa: delete service (host-interaction/service/delete)
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; Attributes: bp-based frame
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public UninstallService
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UninstallService proc near
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...
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To use, invoke from the IDA Pro scripting dialog,
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such as via Alt-F9,
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and then select the existing capa report from the file system.
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This script will verify that the report matches the workspace.
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Check the output window for any errors, and/or the summary of changes.
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"""
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import logging
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import binascii
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from pathlib import Path
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import ida_nalt
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import ida_funcs
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import ida_kernwin
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import capa.rules
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import capa.features.freeze
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import capa.render.result_document
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logger = logging.getLogger("capa")
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def append_func_cmt(va, cmt, repeatable=False):
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"""
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add the given comment to the given function,
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if it doesn't already exist.
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"""
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func = ida_funcs.get_func(va)
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if not func:
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raise ValueError("not a function")
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existing = ida_funcs.get_func_cmt(func, repeatable) or ""
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if cmt in existing:
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return
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if len(existing) > 0:
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new = existing + "\n" + cmt
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else:
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new = cmt
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ida_funcs.set_func_cmt(func, new, repeatable)
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def main():
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path = ida_kernwin.ask_file(False, "*", "capa report")
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if not path:
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return 0
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result_doc = capa.render.result_document.ResultDocument.from_file(Path(path))
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meta, capabilities = result_doc.to_capa()
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# in IDA 7.4, the MD5 hash may be truncated, for example:
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# wanted: 84882c9d43e23d63b82004fae74ebb61
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# found: b'84882C9D43E23D63B82004FAE74EBB6\x00'
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#
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# see: https://github.com/idapython/bin/issues/11
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a = meta.sample.md5.lower()
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b = binascii.hexlify(ida_nalt.retrieve_input_file_md5()).decode("ascii").lower()
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if not a.startswith(b):
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logger.error("sample mismatch")
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return -2
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rows = []
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for name in capabilities.keys():
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rule = result_doc.rules[name]
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if rule.meta.lib:
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continue
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if rule.meta.is_subscope_rule:
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continue
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if rule.meta.scopes.static == capa.rules.Scope.FUNCTION:
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continue
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ns = rule.meta.namespace
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for address, _ in rule.matches:
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if address.type != capa.features.freeze.AddressType.ABSOLUTE:
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continue
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va = address.value
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rows.append((ns, name, va))
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# order by (namespace, name) so that like things show up together
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rows = sorted(rows)
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for ns, name, va in rows:
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if ns:
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cmt = name + f"({ns})"
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else:
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cmt = name
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logger.info("0x%x: %s", va, cmt)
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try:
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# message will look something like:
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#
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# capa: delete service (host-interaction/service/delete)
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append_func_cmt(va, "capa: " + cmt, repeatable=False)
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except ValueError:
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continue
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logger.info("ok")
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main()
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