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77 lines
3.5 KiB
Python
77 lines
3.5 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 volatility.framework import exceptions, interfaces
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from volatility.framework import renderers, contexts
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from volatility.framework.automagic import mac
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from volatility.framework.configuration import requirements
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from volatility.framework.interfaces import plugins
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from volatility.framework.renderers import format_hints
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from volatility.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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@classmethod
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def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
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return [
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requirements.TranslationLayerRequirement(name = 'primary',
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description = 'Memory layer for the kernel',
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architectures = ["Intel32", "Intel64"]),
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requirements.SymbolTableRequirement(name = "darwin", description = "Mac kernel symbols"),
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requirements.PluginRequirement(name = 'lsmod', plugin = lsmod.Lsmod, version = (1, 0, 0))
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]
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def _generator(self):
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kernel = contexts.Module(self.context, self.config['darwin'], self.config['primary'], 0)
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mods = lsmod.Lsmod.list_modules(self.context, self.config['primary'], self.config['darwin'])
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handlers = mac.MacUtilities.generate_kernel_handler_info(self.context, self.config['primary'], kernel, mods)
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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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cpu_data_ptrs_addr = kernel.object(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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cpu_data_ptrs = kernel.object(object_type = "array",
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offset = cpu_data_ptrs_addr,
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subtype = kernel.get_type('cpu_data'),
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count = real_ncpus)
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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(self.context, handlers, handler)
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yield (0, (format_hints.Hex(handler), format_hints.Hex(timer.param0), format_hints.Hex(timer.param1), \
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timer.deadline, entry_time, module_name, symbol_name))
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def run(self):
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return renderers.TreeGrid([("Function", format_hints.Hex), ("Param 0", format_hints.Hex),
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("Param 1", format_hints.Hex), ("Deadline", int), ("Entry Time", int),
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("Module", str), ("Symbol", str)], self._generator())
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