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https://github.com/volatilityfoundation/volatility3.git
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114 lines
3.8 KiB
Python
114 lines
3.8 KiB
Python
# This file is Copyright 2020 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
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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.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 Timers(plugins.PluginInterface):
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"""Check for malicious kernel timers."""
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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):
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kernel = self.context.modules[self.config["kernel"]]
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mods = lsmod.Lsmod.list_modules(self.context, 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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real_ncpus = kernel.object_from_symbol(symbol_name="real_ncpus")
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cpu_data_ptrs_ptr = kernel.get_symbol("cpu_data_ptr").address
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# Returns the a pointer to the absolute address
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cpu_data_ptrs_addr = kernel.object(
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object_type="pointer",
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offset=cpu_data_ptrs_ptr,
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subtype=kernel.get_type("long unsigned int"),
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)
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cpu_data_ptrs = kernel.object(
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object_type="array",
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offset=cpu_data_ptrs_addr,
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absolute=True,
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subtype=kernel.get_type("cpu_data"),
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count=real_ncpus,
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)
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for cpu_data_ptr in cpu_data_ptrs:
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try:
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queue = cpu_data_ptr.rtclock_timer.queue.head
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except exceptions.InvalidAddressException:
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break
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for timer in queue.walk_list(queue, "q_link", "call_entry"):
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try:
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handler = timer.func.dereference().vol.offset
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except exceptions.InvalidAddressException:
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continue
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if timer.has_member("entry_time"):
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entry_time = timer.entry_time
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else:
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entry_time = -1
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module_name, symbol_name = mac.MacUtilities.lookup_module_address(
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self.context, handlers, handler, 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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format_hints.Hex(handler),
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format_hints.Hex(timer.param0),
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format_hints.Hex(timer.param1),
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timer.deadline,
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entry_time,
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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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("Function", format_hints.Hex),
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("Param 0", format_hints.Hex),
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("Param 1", format_hints.Hex),
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("Deadline", int),
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("Entry Time", int),
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("Module", str),
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("Symbol", str),
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],
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self._generator(),
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)
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