mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
Andrew C
126 lines
5.0 KiB
Python
126 lines
5.0 KiB
Python
# Volatility
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# Copyright (C) 2007-2013 Volatility Foundation
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#
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# This file is part of Volatility.
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#
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# Volatility is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Volatility is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
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#
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import volatility.plugins.malware.malfind as malfind
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import volatility.plugins.linux.pslist as pslist
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import volatility.plugins.linux.common as linux_common
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import volatility.utils as utils
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import volatility.debug as debug
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import re
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try:
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import yara
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has_yara = True
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except ImportError:
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has_yara = False
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class VmaYaraScanner(malfind.BaseYaraScanner):
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"""A scanner over all memory regions of a process."""
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def __init__(self, task = None, **kwargs):
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"""Scan the process address space through the VMAs.
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Args:
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task: The task_struct object for this task.
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"""
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self.task = task
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malfind.BaseYaraScanner.__init__(self, address_space = task.get_process_address_space(), **kwargs)
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def scan(self, offset = 0, maxlen = None):
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for vma in self.task.get_proc_maps():
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for match in malfind.BaseYaraScanner.scan(self, vma.vm_start, vma.vm_end - vma.vm_start):
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yield match
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class linux_yarascan(malfind.YaraScan):
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"""A shell in the Linux memory image"""
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@staticmethod
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def is_valid_profile(profile):
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return profile.metadata.get('os', 'Unknown').lower() == 'linux'
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def filter_tasks(self):
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tasks = pslist.linux_pslist(self._config).calculate()
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if self._config.PID is not None:
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try:
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pidlist = [int(p) for p in self._config.PID.split(',')]
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except ValueError:
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debug.error("Invalid PID {0}".format(self._config.PID))
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pids = [t for t in tasks if t.pid in pidlist]
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if len(pids) == 0:
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debug.error("Cannot find PID {0}. If its terminated or unlinked, use psscan and then supply --offset=OFFSET".format(self._config.PID))
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return pids
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if self._config.NAME is not None:
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try:
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name_re = re.compile(self._config.NAME, re.I)
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except re.error:
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debug.error("Invalid name {0}".format(self._config.NAME))
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names = [t for t in tasks if name_re.search(str(t.comm))]
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if len(names) == 0:
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debug.error("Cannot find name {0}. If its terminated or unlinked, use psscan and then supply --offset=OFFSET".format(self._config.NAME))
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return names
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return tasks
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def calculate(self):
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## we need this module imported
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if not has_yara:
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debug.error("Please install Yara from https://plusvic.github.io/yara/")
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## leveraged from the windows yarascan plugin
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rules = self._compile_rules()
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## set the linux plugin address spaces
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linux_common.set_plugin_members(self)
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if self._config.KERNEL:
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## the start of kernel memory taken from VolatilityLinuxIntelValidAS
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if self.addr_space.profile.metadata.get('memory_model', '32bit') == "32bit":
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kernel_start = 0xc0000000
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else:
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kernel_start = 0xffffffff80000000
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scanner = malfind.DiscontigYaraScanner(rules = rules,
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address_space = self.addr_space)
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for hit, address in scanner.scan(start_offset = kernel_start):
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yield (None, address, hit,
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scanner.address_space.zread(address - self._config.REVERSE, self._config.SIZE))
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else:
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tasks = self.filter_tasks()
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for task in tasks:
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scanner = VmaYaraScanner(task = task, rules = rules)
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for hit, address in scanner.scan():
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yield (task, address, hit,
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scanner.address_space.zread(address - self._config.REVERSE, self._config.SIZE))
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def render_text(self, outfd, data):
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for task, address, hit, buf in data:
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if task:
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outfd.write("Task: {0} pid {1} rule {2} addr {3:#x}\n".format(
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task.comm, task.pid, hit.rule, address))
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else:
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outfd.write("[kernel] rule {0} addr {1:#x}\n".format(hit.rule, address))
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outfd.write("".join(["{0:#010x} {1:<48} {2}\n".format(
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address + o, h, ''.join(c)) for o, h, c in utils.Hexdump(buf)]))
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