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https://github.com/volatilityfoundation/volatility3.git
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88 lines
3.9 KiB
Python
88 lines
3.9 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 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.objects import utility
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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 Check_syscall(plugins.PluginInterface):
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"""Check system call table for hooks."""
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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, mods: Iterator[Any]):
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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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policy_list = kernel.object_from_symbol(symbol_name = "_mac_policy_list").cast("mac_policy_list")
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entries = kernel.object(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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count = policy_list.staticmax + 1)
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mask = self.context.layers[self.config['primary']].address_mask
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mods_list = [(mod.name, mod.address & mask, (mod.address & mask) + mod.size) for mod in mods]
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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.PagedInvalidAddressException:
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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.PagedInvalidAddressException:
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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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found_module = None
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for mod_name_info, mod_base, mod_end in mods_list:
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if call_addr >= mod_base and call_addr <= mod_end:
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found_module = mod_name_info
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break
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if found_module:
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symbol_module = utility.array_to_string(found_module)
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else:
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symbol_module = "UNKNOWN"
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yield (0, (check, ent_name, symbol_module, format_hints.Hex(call_addr)))
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def run(self):
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return renderers.TreeGrid([("Member", str), ("Policy Name", str), ("Handler Module", str),
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("Handler Address", format_hints.Hex)],
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self._generator(
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lsmod.Lsmod.list_modules(self.context, self.config['primary'],
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self.config['darwin'])))
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