mirror of
https://github.com/volatilityfoundation/volatility3.git
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122 lines
5.2 KiB
Python
122 lines
5.2 KiB
Python
import volatility.framework.interfaces.plugins as interfaces_plugins
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import volatility.framework.interfaces.renderers as interfaces_renderers
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import volatility.plugins.windows.pslist as pslist
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import volatility.plugins.windows.vadinfo as vadinfo
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from volatility.framework import constants
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from volatility.framework import renderers
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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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class Malfind(interfaces_plugins.PluginInterface):
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"""Lists process memory ranges that potentially contain injected code"""
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@classmethod
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def get_requirements(cls):
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# Since we're calling the plugin, make sure we have the plugin's requirements
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return pslist.PsList.get_requirements() + []
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@classmethod
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def is_vad_empty(self, proc_layer, vad):
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"""Check if a VAD region is either entirely unavailable
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due to paging, entirely consisting of zeros, or a
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combination of the two. This helps ignore false positives
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whose VAD flags match task._injection_filter requirements
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but there's no data and thus not worth reporting it.
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:param proc_layer: the process layer
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:param vad: the MMVAD structure to test
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"""
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CHUNK_SIZE = 0x1000
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all_zero_page = "\x00" * CHUNK_SIZE
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offset = 0
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vad_length = vad.get_end() - vad.get_start()
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while offset < vad_length:
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next_addr = vad.get_start() + offset
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if proc_layer.is_valid(next_addr) and proc_layer.read(next_addr, CHUNK_SIZE) != all_zero_page:
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return False
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offset += CHUNK_SIZE
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return True
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def list_injections(self, vadinfo_plugin, proc):
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"""Generate memory regions for a process that may contain
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injected code.
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:param vadinfo_plugin: an instance of the plugins.vadinfo.VadInfo plugin
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:param proc: an _EPROCESS instance
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"""
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proc_layer_name = proc.add_process_layer()
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proc_layer = self.context.memory[proc_layer_name]
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for vad in proc.get_vad_root().traverse():
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protection_string = vad.get_protection(vadinfo_plugin.protect_values(), vadinfo.winnt_protections)
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write_exec = "EXECUTE" in protection_string and "WRITE" in protection_string
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# the write/exec check applies to everything
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if not write_exec:
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continue
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if (vad.get_private_memory() == 1 and vad.get_tag() == "VadS") or (
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vad.get_private_memory() == 0 and protection_string != "PAGE_EXECUTE_WRITECOPY"):
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if self.is_vad_empty(proc_layer, vad):
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continue
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data = proc_layer.read(vad.get_start(), 64, pad = True)
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yield vad, data
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def _generator(self, procs):
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vadinfo_plugin = vadinfo.VadInfo(self.context, self.config_path)
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# determine if we're on a 32 or 64 bit kernel
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if self.context.symbol_space.get_type(self.config["nt_symbols"] + constants.BANG + "pointer").size == 4:
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is_32bit_arch = True
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else:
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is_32bit_arch = False
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for proc in procs:
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process_name = utility.array_to_string(proc.ImageFileName)
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for vad, data in self.list_injections(vadinfo_plugin, proc):
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# if we're on a 64 bit kernel, we may still need 32 bit disasm due to wow64
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if is_32bit_arch or proc.get_is_wow64():
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architecture = "intel"
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else:
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architecture = "intel64"
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disasm = interfaces_renderers.Disassembly(data, vad.get_start(), architecture)
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yield (0, (proc.UniqueProcessId,
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process_name,
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format_hints.Hex(vad.get_start()),
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format_hints.Hex(vad.get_end()),
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vad.get_tag(),
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vad.get_protection(vadinfo_plugin.protect_values(), vadinfo.winnt_protections),
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vad.get_commit_charge(),
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vad.get_private_memory(),
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format_hints.HexBytes(data),
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disasm))
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def run(self):
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filter = pslist.PsList.create_filter([self.config.get('pid', None)])
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return renderers.TreeGrid([("PID", int),
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("Process", str),
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("Start VPN", format_hints.Hex),
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("End VPN", format_hints.Hex),
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("Tag", str),
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("Protection", str),
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("CommitCharge", int),
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("PrivateMemory", int),
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("Hexdump", format_hints.HexBytes),
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("Disasm", interfaces_renderers.Disassembly)],
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self._generator(pslist.PsList.list_processes(self.context,
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self.config['primary'],
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self.config['nt_symbols'],
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filter = filter)))
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