/usr/lib/python2.7/dist-packages/volatility/plugins/procdump.py is in volatility 2.3.1-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2007-2013 Volatility Foundation
# Copyright (c) 2008 Brendan Dolan-Gavitt <bdolangavitt@wesleyan.edu>
#
# Additional Authors:
# Mike Auty <mike.auty@gmail.com>
#
# This file is part of Volatility.
#
# Volatility is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License Version 2 as
# published by the Free Software Foundation. You may not use, modify or
# distribute this program under any other version of the GNU General
# Public License.
#
# Volatility is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
#
import os
import struct
import volatility.plugins.taskmods as taskmods
import volatility.debug as debug
import volatility.obj as obj
import volatility.exceptions as exceptions
class ProcExeDump(taskmods.DllList):
"""Dump a process to an executable file sample"""
def __init__(self, config, *args, **kwargs):
taskmods.DllList.__init__(self, config, *args, **kwargs)
config.add_option('DUMP-DIR', short_option = 'D', default = None,
cache_invalidator = False,
help = 'Directory in which to dump executable files')
config.add_option("UNSAFE", short_option = "u", default = False, action = 'store_true',
help = 'Bypasses certain sanity checks when creating image')
def dump_pe(self, space, base, dump_file):
"""
Dump a PE from an AS into a file.
@param space: an AS to use
@param base: PE base address
@param dump_file: dumped file name
@returns a string status message
"""
of = open(os.path.join(self._config.DUMP_DIR, dump_file), 'wb')
try:
for offset, code in self.get_image(space, base):
of.seek(offset)
of.write(code)
result = "OK: {0}".format(dump_file)
except ValueError, ve:
result = "Error: {0}".format(ve)
except exceptions.SanityCheckException, ve:
result = "Error: {0} Try -u/--unsafe".format(ve)
finally:
of.close()
return result
def render_text(self, outfd, data):
"""Renders the tasks to disk images, outputting progress as they go"""
if self._config.DUMP_DIR == None:
debug.error("Please specify a dump directory (--dump-dir)")
if not os.path.isdir(self._config.DUMP_DIR):
debug.error(self._config.DUMP_DIR + " is not a directory")
self.table_header(outfd,
[("Process(V)", "[addrpad]"),
("ImageBase", "[addrpad]"),
("Name", "20"),
("Result", "")])
for task in data:
task_space = task.get_process_address_space()
if task_space == None:
result = "Error: Cannot acquire process AS"
elif task.Peb == None:
# we must use m() here, because any other attempt to
# reference task.Peb will try to instantiate the _PEB
result = "Error: PEB at {0:#x} is paged".format(task.m('Peb'))
elif task_space.vtop(task.Peb.ImageBaseAddress) == None:
result = "Error: ImageBaseAddress at {0:#x} is paged".format(task.Peb.ImageBaseAddress)
else:
dump_file = "executable." + str(task.UniqueProcessId) + ".exe"
result = self.dump_pe(task_space,
task.Peb.ImageBaseAddress,
dump_file)
self.table_row(outfd,
task.obj_offset,
task.Peb.ImageBaseAddress,
task.ImageFileName,
result)
def round(self, addr, align, up = False):
"""Rounds down an address based on an alignment"""
if addr % align == 0:
return addr
else:
if up:
return (addr + (align - (addr % align)))
return (addr - (addr % align))
def get_nt_header(self, addr_space, base_addr):
"""Returns the NT Header object for a task"""
dos_header = obj.Object("_IMAGE_DOS_HEADER", offset = base_addr,
vm = addr_space)
return dos_header.get_nt_header()
def get_code(self, addr_space, data_start, data_size, offset):
"""Returns a single section of re-created data from a file image"""
first_block = 0x1000 - data_start % 0x1000
full_blocks = ((data_size + (data_start % 0x1000)) / 0x1000) - 1
left_over = (data_size + data_start) % 0x1000
paddr = addr_space.vtop(data_start)
code = ""
# Deal with reads that are smaller than a block
if data_size < first_block:
data_read = addr_space.zread(data_start, data_size)
if paddr == None:
if self._config.verbose:
debug.debug("Memory Not Accessible: Virtual Address: 0x{0:x} File Offset: 0x{1:x} Size: 0x{2:x}\n".format(data_start, offset, data_size))
code += data_read
return (offset, code)
data_read = addr_space.zread(data_start, first_block)
if paddr == None:
if self._config.verbose:
debug.debug("Memory Not Accessible: Virtual Address: 0x{0:x} File Offset: 0x{1:x} Size: 0x{2:x}\n".format(data_start, offset, first_block))
code += data_read
# The middle part of the read
new_vaddr = data_start + first_block
for _i in range(0, full_blocks):
data_read = addr_space.zread(new_vaddr, 0x1000)
if addr_space.vtop(new_vaddr) == None:
if self._config.verbose:
debug.debug("Memory Not Accessible: Virtual Address: 0x{0:x} File Offset: 0x{1:x} Size: 0x{2:x}\n".format(new_vaddr, offset, 0x1000))
code += data_read
new_vaddr = new_vaddr + 0x1000
# The last part of the read
if left_over > 0:
data_read = addr_space.zread(new_vaddr, left_over)
if addr_space.vtop(new_vaddr) == None:
if self._config.verbose:
debug.debug("Memory Not Accessible: Virtual Address: 0x{0:x} File Offset: 0x{1:x} Size: 0x{2:x}\n".format(new_vaddr, offset, left_over))
code += data_read
return (offset, code)
def get_image(self, addr_space, base_addr):
"""Outputs an executable disk image of a process"""
nt_header = self.get_nt_header(addr_space = addr_space,
base_addr = base_addr)
soh = nt_header.OptionalHeader.SizeOfHeaders
header = addr_space.zread(base_addr, soh)
yield (0, header)
fa = nt_header.OptionalHeader.FileAlignment
for sect in nt_header.get_sections(self._config.UNSAFE):
foa = self.round(sect.PointerToRawData, fa)
if foa != sect.PointerToRawData:
debug.warning("Section start on disk not aligned to file alignment.\n")
debug.warning("Adjusted section start from {0} to {1}.\n".format(sect.PointerToRawData, foa))
yield self.get_code(addr_space,
sect.VirtualAddress + base_addr,
sect.SizeOfRawData, foa)
class ProcMemDump(ProcExeDump):
"""Dump a process to an executable memory sample"""
def replace_header_field(self, sect, header, item, value):
"""Replaces a field in a sector header"""
field_size = item.size()
start = item.obj_offset - sect.obj_offset
end = start + field_size
newval = struct.pack(item.format_string, int(value))
result = header[:start] + newval + header[end:]
return result
def get_image(self, addr_space, base_addr):
"""Outputs an executable memory image of a process"""
nt_header = self.get_nt_header(addr_space, base_addr)
sa = nt_header.OptionalHeader.SectionAlignment
shs = addr_space.profile.get_obj_size('_IMAGE_SECTION_HEADER')
yield self.get_code(addr_space, base_addr, nt_header.OptionalHeader.SizeOfImage, 0)
prevsect = None
sect_sizes = []
for sect in nt_header.get_sections(self._config.UNSAFE):
if prevsect is not None:
sect_sizes.append(sect.VirtualAddress - prevsect.VirtualAddress)
prevsect = sect
if prevsect is not None:
sect_sizes.append(self.round(prevsect.Misc.VirtualSize, sa, up = True))
counter = 0
start_addr = nt_header.FileHeader.SizeOfOptionalHeader + (nt_header.OptionalHeader.obj_offset - base_addr)
for sect in nt_header.get_sections(self._config.UNSAFE):
sectheader = addr_space.read(sect.obj_offset, shs)
# Change the PointerToRawData
sectheader = self.replace_header_field(sect, sectheader, sect.PointerToRawData, sect.VirtualAddress)
sectheader = self.replace_header_field(sect, sectheader, sect.SizeOfRawData, sect_sizes[counter])
sectheader = self.replace_header_field(sect, sectheader, sect.Misc.VirtualSize, sect_sizes[counter])
yield (start_addr + (counter * shs), sectheader)
counter += 1
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