Repository: mandiant/capa
File: capa/ghidra/capa_explorer.py (Python)

Code before:

def get_capabilities():
    rules_dir: str = ""
    try:
        selected_dir = askDirectory("Choose capa rules directory", "Ok")  # type: ignore [name-defined] # noqa: F821
        if selected_dir:
            rules_dir = selected_dir.getPath()
    except RuntimeError:
        # RuntimeError thrown when user selects "Cancel"
        pass

    if not rules_dir:
        logger.info("You must choose a capa rules directory before running capa.")
        return ""  # return empty str to avoid handling both int and str types

    rules_path: pathlib.Path = pathlib.Path(rules_dir)
    logger.info("running capa using rules from %s", str(rules_path))

    rules = capa.main.get_rules([rules_path])
    meta = capa.ghidra.helpers.collect_metadata([rules_path])
    extractor = capa.features.extractors.ghidra.extractor.GhidraFeatureExtractor()

    capabilities, counts = capa.main.find_capabilities(rules, extractor, True)

    if capa.main.has_file_limitation(rules, capabilities, is_standalone=False):
        popup("Capa Explorer encountered warnings during analysis. Please check the console output for more information.")  # type: ignore [name-defined] # noqa: F821
        logger.info("capa encountered warnings during analysis")

    return capa.render.json.render(meta, rules, capabilities)


def get_locations(match_dict):
    """recursively collect match addresses and associated nodes"""

    for loc in match_dict.get("locations", {}):
        # either an rva (absolute)
        # or an offset into a file (file)
        if loc.get("type", "") in ("absolute", "file"):
            yield loc.get("value"), match_dict.get("node")

    for child in match_dict.get("children", {}):
        yield from get_locations(child)


def parse_json(capa_data):
    """Parse json produced by capa"""

    rules = capa_data["rules"]
    for rule in capa_data.get("rules", {}).keys():
        # loosely coupled location & node data lists
        this_locs = []

Review comment (suggestion):
```suggestion
        popup("capa explorer encountered warnings during analysis. Please check the console output for more information.")  # type: ignore [name-defined] # noqa: F821
```

Code after:

        # handle function main scope of matched rule
        # these will typically contain further matches within
        if self.scope == "function":
            for addr in self.matches.keys():
                ghidra_addr = toAddr(hex(addr))  # type: ignore [name-defined] # noqa: F821

                # classify new function label under capa-generated namespace
                sym = symbol_table.getPrimarySymbol(ghidra_addr)
                if sym is not None:
                    if sym.getSymbolType() == SymbolType.FUNCTION:
                        create_label(ghidra_addr, sym.getName(), capa_namespace)
                        self.set_plate_comment(ghidra_addr)

                    # parse the corresponding nodes, and pre-comment subscope matched features
                    # under the encompassing function(s)
                    for sub_match in self.matches.get(addr):
                        for loc, node in sub_match.items():
                            sub_ghidra_addr = toAddr(hex(loc))  # type: ignore [name-defined] # noqa: F821
                            if sub_ghidra_addr == ghidra_addr:
                                # skip duplicates
                                continue

                            # precomment subscope matches under the function
                            if node != {}:
                                for sub_type, description in parse_node(node):
                                    self.set_pre_comment(sub_ghidra_addr, sub_type, description)
        else:
            # resolve the encompassing function for the capa namespace
            # of non-function scoped main matches
            for addr in self.matches.keys():
                ghidra_addr = toAddr(hex(addr))  # type: ignore [name-defined] # noqa: F821

                # basic block / insn scoped main matches
                # Ex. See "Create Process on Windows" Rule
                func = getFunctionContaining(ghidra_addr)  # type: ignore [name-defined] # noqa: F821
                if func is not None:
                    func_addr = func.getEntryPoint()
                    create_label(func_addr, func.getName(), capa_namespace)
                    self.set_plate_comment(func_addr)

                # create subscope match precomments
                for sub_match in self.matches.get(addr):
                    for loc, node in sub_match.items():
                        sub_ghidra_addr = toAddr(hex(loc))  # type: ignore [name-defined] # noqa: F821

                        if node != {}:
                            if func is not None:
                                # basic block/ insn scope under resolved function
                                for sub_type, description in parse_node(node):
                                    self.set_pre_comment(sub_ghidra_addr, sub_type, description)