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80 lines
3.5 KiB
Python
80 lines
3.5 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
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import volatility
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from volatility.framework import exceptions, interfaces
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from volatility.framework import renderers, constants, 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.framework.objects import utility
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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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]
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def _generator(self):
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mac.MacUtilities.aslr_mask_symbol_table(self.context, self.config['darwin'], self.config['primary'])
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kernel = contexts.Module(self._context, self.config['darwin'], self.config['primary'], 0)
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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
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except exceptions.InvalidAddressException:
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continue
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symbols = list(self.context.symbol_space.get_symbols_by_location(handler))
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if len(symbols) > 0:
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sym_name = str(symbols[0].split(constants.BANG)[1]) if constants.BANG in symbols[0] else \
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str(symbols[0])
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else:
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sym_name = "UNKNOWN"
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if hasattr(timer, "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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yield (0, (format_hints.Hex(handler), format_hints.Hex(timer.param0), format_hints.Hex(timer.param1), timer.deadline, entry_time, "kernel", sym_name))
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def run(self):
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return renderers.TreeGrid([("Function", format_hints.Hex), ("Param 0", format_hints.Hex), ("Param 1", format_hints.Hex),
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("Deadline", int), ("Entry Time", int), ("Module", str), ("Symbol", str)],
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self._generator())
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