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https://github.com/volatilityfoundation/volatility3.git
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108 lines
3.7 KiB
Python
108 lines
3.7 KiB
Python
# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
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# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
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#
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import logging
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from typing import List, Iterator, Any
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from volatility3.framework import exceptions, interfaces
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from volatility3.framework import renderers
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from volatility3.framework.configuration import requirements
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from volatility3.framework.interfaces import plugins
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from volatility3.framework.objects import utility
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from volatility3.framework.renderers import format_hints
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from volatility3.framework.symbols import mac
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from volatility3.plugins.mac import lsmod
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vollog = logging.getLogger(__name__)
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class Trustedbsd(plugins.PluginInterface):
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"""Checks for malicious trustedbsd modules"""
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_required_framework_version = (2, 0, 0)
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@classmethod
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def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
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return [
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requirements.ModuleRequirement(
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name="kernel",
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description="Kernel module for the OS",
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architectures=["Intel32", "Intel64"],
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),
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requirements.VersionRequirement(
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name="macutils", component=mac.MacUtilities, version=(1, 3, 0)
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),
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requirements.PluginRequirement(
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name="lsmod", plugin=lsmod.Lsmod, version=(2, 0, 0)
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),
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]
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def _generator(self, mods: Iterator[Any]):
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kernel = self.context.modules[self.config["kernel"]]
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handlers = mac.MacUtilities.generate_kernel_handler_info(
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self.context, kernel.layer_name, kernel, mods
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)
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policy_list = kernel.object_from_symbol(symbol_name="mac_policy_list").cast(
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"mac_policy_list"
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)
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entries = kernel.object(
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object_type="array",
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offset=policy_list.entries.dereference().vol.offset,
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subtype=kernel.get_type("mac_policy_list_element"),
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absolute=True,
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count=policy_list.staticmax + 1,
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)
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for i, ent in enumerate(entries):
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# I don't know how this can happen, but the kernel makes this check all over the place
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# the policy isn't useful without any ops so a rootkit can't abuse this
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try:
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mpc = ent.mpc.dereference()
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ops = mpc.mpc_ops.dereference()
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except exceptions.InvalidAddressException:
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continue
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try:
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ent_name = utility.pointer_to_string(mpc.mpc_name, 255)
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except exceptions.InvalidAddressException:
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ent_name = "N/A"
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for check in ops.vol.members:
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call_addr = getattr(ops, check)
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if call_addr is None or call_addr == 0:
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continue
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module_name, symbol_name = mac.MacUtilities.lookup_module_address(
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self.context, handlers, call_addr, self.config["kernel"]
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)
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yield (
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0,
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(
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check,
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ent_name,
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format_hints.Hex(call_addr),
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module_name,
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symbol_name,
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),
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)
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def run(self):
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return renderers.TreeGrid(
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[
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("Member", str),
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("Policy Name", str),
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("Handler Address", format_hints.Hex),
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("Handler Module", str),
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("Handler Symbol", str),
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],
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self._generator(
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lsmod.Lsmod.list_modules(self.context, self.config["kernel"])
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),
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)
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