mirror of
https://github.com/volatilityfoundation/volatility
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iMHLv2
144 lines
4.8 KiB
Python
144 lines
4.8 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.obj as obj
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import volatility.debug as debug
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import volatility.plugins.linux.common as linux_common
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import volatility.plugins.linux.pslist as linux_pslist
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import volatility.plugins.malware.malfind as malfind
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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 PassphraseScanner(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,
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address_space = task.get_process_address_space(),
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**kwargs)
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def scan(self, offset = 0, maxlen = None):
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profile = self.address_space.profile
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offset = profile.get_obj_offset("PASSPHRASE", "MaxLength")
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for vma in self.task.get_proc_maps():
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# only scanning the process heap
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if not (vma.vm_start <= self.task.mm.start_brk
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and vma.vm_end >= self.task.mm.brk):
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continue
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for hit, address in malfind.BaseYaraScanner.scan(self,
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vma.vm_start,
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vma.vm_end - vma.vm_start):
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# possible passphrase structure
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passt = obj.Object("PASSPHRASE",
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offset = address - offset,
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vm = self.address_space)
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# the sanity checks
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if (passt and vma.vm_start <= passt.Text and
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vma.vm_end >= passt.Text and
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passt.Length > 0 and
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passt.Length < passt.MaxLength):
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password = passt.Text.dereference()
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if len(password) != passt.Length:
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continue
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yield address, password
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class LinuxTruecryptModification(obj.ProfileModification):
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"""A modification for Linux Truecrypt passphrases"""
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conditions = {'os': lambda x: x == 'linux'}
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def modification(self, profile):
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x86_vtypes = {
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'PASSPHRASE': [ None, {
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'Text': [ 0, ['pointer', ['String', dict(length = 255)]]],
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'MaxLength': [ 0x4, ['int']],
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'Length': [ 0x8, ['int']],
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}]}
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x64_vtypes = {
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'PASSPHRASE': [ None, {
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'Text': [ 0, ['pointer', ['String', dict(length = 255)]]],
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'MaxLength': [ 0x8, ['int']],
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'Length': [ 0xC, ['int']],
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}]}
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bits = profile.metadata.get("memory_model", "32bit")
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if bits == "32bit":
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vtypes = x86_vtypes
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else:
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vtypes = x64_vtypes
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profile.vtypes.update(vtypes)
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class linux_truecrypt_passphrase(linux_pslist.linux_pslist):
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""" Recovers cached Truecrypt passphrases """
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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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linux_common.set_plugin_members(self)
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tasks = linux_pslist.linux_pslist.calculate(self)
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for task in tasks:
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if str(task.comm) != "truecrypt":
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continue
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space = task.get_process_address_space()
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if not space:
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continue
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rules = yara.compile(sources = {
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'n' : 'rule r1 {strings: $a = {40 00 00 00 ?? 00 00 00} condition: $a}'
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})
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scanner = PassphraseScanner(task = task, rules = rules)
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for address, password in scanner.scan():
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yield task, address, password
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def render_text(self, outfd, data):
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self.table_header(outfd, [("Process", "16"),
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("Pid", "8"),
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("Address", "[addrpad]"),
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("Password", "")])
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for (task, address, password) in data:
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self.table_row(outfd, task.comm, task.pid, address, password) |