/usr/lib/python2.7/dist-packages/rekall/plugins/windows/filescan.py is in python-rekall-core 1.6.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 | #!/usr/bin/env python
#
# fileobjscan.py
# Copyright 2009 Andreas Schuster <a.schuster@yendor.net>
# Copyright (C) 2009-2011 Volatile Systems
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
# pylint: disable=protected-access
"""
@author: Andreas Schuster
@license: GNU General Public License 2.0 or later
@contact: a.schuster@forensikblog.de
@organization: http://computer.forensikblog.de/en/
"""
from rekall.plugins.windows import common
class PoolScanFile(common.PoolScanner):
"""PoolScanner for File objects"""
def __init__(self, **kwargs):
super(PoolScanFile, self).__init__(**kwargs)
self.checks = [
('PoolTagCheck', dict(
tag=self.profile.get_constant("FILE_POOLTAG"))),
('CheckPoolSize', dict(
min_size=self.profile.get_obj_size("_FILE_OBJECT"))),
('CheckPoolType', dict(
paged=True, non_paged=True, free=True)),
('CheckPoolIndex', dict(value=0)),
]
class FileScan(common.PoolScannerPlugin):
""" Scan Physical memory for _FILE_OBJECT pool allocations
"""
__name = "filescan"
table_header = [
dict(name='a', width=1),
dict(name="offset", style="address"),
dict(name="ptr_no", width=6, align="r"),
dict(name="hnd_no", width=3, align="r"),
dict(name="access", width=6),
dict(name='Owner', type="_EPROCESS"),
dict(name="path")
]
scanner_defaults = dict(
scan_kernel_nonpaged_pool=True
)
def collect(self):
"""Generate possible hits."""
for run in self.generate_memory_ranges():
scanner = PoolScanFile(profile=self.profile, session=self.session,
address_space=run.address_space)
for pool_obj in scanner.scan(run.start, run.length):
for object_obj in pool_obj.IterObject("File", freed=True):
## If the string is not reachable we skip it
file_obj = self.session.profile._FILE_OBJECT(
offset=object_obj.obj_end, vm=run.address_space)
if not file_obj.FileName.v(vm=self.kernel_address_space):
continue
# Real file objects have valid DeviceObject types.
device_obj = file_obj.DeviceObject.deref(
vm=self.session.kernel_address_space)
if not device_obj.DeviceType.is_valid():
continue
# The Process member in the HandleInfo sometimes points at
# the _EPROCESS owning the handle.
owner_process = (
object_obj.HandleInfo.SingleEntry.Process.deref(
vm=self.kernel_address_space))
filename = file_obj.file_name_with_drive(
vm=self.kernel_address_space)
yield dict(a='F' if pool_obj.FreePool else "",
offset=file_obj.obj_offset,
ptr_no=object_obj.PointerCount,
hnd_no=object_obj.HandleCount,
access=file_obj.AccessString,
Owner=owner_process,
path=filename)
class PoolScanDriver(common.PoolScanner):
""" Scanner for _DRIVER_OBJECT """
def __init__(self, **kwargs):
super(PoolScanDriver, self).__init__(**kwargs)
self.checks = [
('PoolTagCheck', dict(
tag=self.profile.get_constant("DRIVER_POOLTAG"))),
# Must be large enough to hold the driver object.
('CheckPoolSize', dict(
condition=lambda x: x > self.profile.get_obj_size(
"_DRIVER_OBJECT"))),
('CheckPoolType', dict(
paged=True, non_paged=True, free=True)),
('CheckPoolIndex', dict(value=0)),
]
class DriverScan(common.PoolScannerPlugin):
"Scan for driver objects _DRIVER_OBJECT "
__name = "driverscan"
table_header = [
dict(name='a', width=1),
dict(name="offset", style="address"),
dict(name="ptr_no", width=6, align="r"),
dict(name="hnd_no", width=3, align="r"),
dict(name="start", style="address"),
dict(name="size", style="address"),
dict(name="servicekey", width=20),
dict(name="name", width=12),
dict(name="path")
]
scanner_defaults = dict(
scan_kernel_nonpaged_pool=True
)
def collect(self):
"""Generate possible hits."""
for run in self.generate_memory_ranges():
scanner = PoolScanDriver(session=self.session,
profile=self.profile,
address_space=run.address_space)
for pool_obj in scanner.scan(run.start, run.length):
for object_obj in pool_obj.IterObject("Driver", freed=True):
object_name = object_obj.NameInfo.Name.v(
vm=self.kernel_address_space)
driver_obj = self.profile._DRIVER_OBJECT(
object_obj.obj_end, vm=run.address_space)
extension_obj = self.profile._DRIVER_EXTENSION(
driver_obj.obj_end, vm=run.address_space)
yield dict(a='F' if pool_obj.FreePool else "",
offset=driver_obj.obj_offset,
ptr_no=object_obj.PointerCount,
hnd_no=object_obj.HandleCount,
start=driver_obj.DriverStart,
size=driver_obj.DriverSize,
servicekey=extension_obj.ServiceKeyName.v(
vm=self.kernel_address_space),
name=object_name,
path=driver_obj.DriverName.v(
vm=self.kernel_address_space)
)
class PoolScanSymlink(common.PoolScanner):
""" Scanner for symbolic link objects """
def __init__(self, **kwargs):
super(PoolScanSymlink, self).__init__(**kwargs)
self.checks = [
('PoolTagCheck', dict(
tag=self.profile.get_constant("SYMLINK_POOLTAG"))),
('CheckPoolSize', dict(
min_size=self.profile.get_obj_size(
"_OBJECT_SYMBOLIC_LINK"))),
('CheckPoolType', dict(paged=True, non_paged=True, free=True)),
]
class SymLinkScan(common.PoolScannerPlugin):
"Scan for symbolic link objects "
__name = "symlinkscan"
table_header = [
dict(name='a', width=1),
dict(name="offset", style="address"),
dict(name="ptr_no", width=6, align="r"),
dict(name="hnd_no", width=3, align="r"),
dict(name="creation_time", width=24),
dict(name="from_link"),
dict(name="to_link", width=60),
]
scanner_defaults = dict(
# According to pool_tracker plugin this always comes from paged pool.
scan_kernel_paged_pool=True
)
def collect(self):
"""Generate possible hits."""
for run in self.generate_memory_ranges():
scanner = PoolScanSymlink(profile=self.profile,
session=self.session,
address_space=run.address_space)
for pool_obj in scanner.scan(run.start, run.length):
for object_obj in pool_obj.IterObject(
"SymbolicLink", freed=True):
object_name = object_obj.NameInfo.Name.v(
vm=self.kernel_address_space)
link_obj = self.profile._OBJECT_SYMBOLIC_LINK(
object_obj.obj_end, vm=run.address_space)
yield dict(a='F' if pool_obj.FreePool else "",
offset=link_obj.obj_offset,
ptr_no=object_obj.PointerCount,
hnd_no=object_obj.HandleCount,
creation_time=link_obj.CreationTime or '',
from_link=object_name,
to_link=link_obj.LinkTarget.v(
vm=self.kernel_address_space))
class PoolScanMutant(PoolScanDriver):
""" Scanner for Mutants _KMUTANT """
def __init__(self, **kwargs):
super(PoolScanMutant, self).__init__(**kwargs)
self.checks = [
('PoolTagCheck', dict(tag=self.profile.get_constant(
"MUTANT_POOLTAG"))),
('CheckPoolSize', dict(
min_size=self.profile.get_obj_size("_KMUTANT"))),
('CheckPoolType', dict(
paged=True, non_paged=True, free=True)),
('CheckPoolIndex', dict(value=0)),
]
class MutantScan(common.PoolScannerPlugin):
"Scan for mutant objects _KMUTANT "
__name = "mutantscan"
table_header = [
dict(name='a', width=1),
dict(name="offset", style="address"),
dict(name="ptr_no", width=6, align="r"),
dict(name="hnd_no", width=3, align="r"),
dict(name="signal", width=6),
dict(name="thread", style="address"),
dict(name="cid", width=9, align="r"),
dict(name="name")
]
scanner_defaults = dict(
scan_kernel_nonpaged_pool=True,
)
def collect(self):
for run in self.generate_memory_ranges():
scanner = PoolScanMutant(profile=self.profile, session=self.session,
address_space=run.address_space)
for pool_obj in scanner.scan(run.start, run.length):
for object_obj in pool_obj.IterObject("Mutant", freed=True):
object_name = object_obj.NameInfo.Name.v(
vm=self.kernel_address_space)
# By default we suppress non-named mutants because they are
# not very interesting.
if self.plugin_args.verbosity < 5 and not object_name:
continue
mutant = self.profile._KMUTANT(
object_obj.obj_end, vm=run.address_space)
if mutant.OwnerThread > 0x80000000:
thread = self.profile._ETHREAD(
offset=mutant.OwnerThread,
vm=self.kernel_address_space)
CID = "{0}:{1}".format(thread.Cid.UniqueProcess,
thread.Cid.UniqueThread)
else:
CID = ""
yield dict(a='F' if pool_obj.FreePool else "",
offset=mutant.obj_offset,
ptr_no=object_obj.PointerCount,
hnd_no=object_obj.HandleCount,
signal=mutant.Header.SignalState,
thread=mutant.OwnerThread,
cid=CID,
name=object_obj.NameInfo.Name.v(
vm=self.kernel_address_space))
class PoolScanProcess(common.PoolScanner):
"""PoolScanner for File objects"""
# Kernel addresses are above this value.
kernel = 0x80000000
def __init__(self, **kwargs):
super(PoolScanProcess, self).__init__(**kwargs)
self.kernel = self.profile.get_constant_object(
"MmSystemRangeStart", "Pointer").v() or 0x80000000
self.checks = [
# Must have the right pool tag.
('PoolTagCheck', dict(
tag=self.profile.get_constant("EPROCESS_POOLTAG"))),
# Must be large enough for an _EPROCESS.
('CheckPoolSize', dict(min_size=self.profile.get_obj_size(
"_EPROCESS"))),
# It seems that on old XP versions _EPROCESS was allocated from
# paged pool but it's rare to see that.
('CheckPoolType', dict(
paged=True, non_paged=True, free=True)),
('CheckPoolIndex', dict(value=0)),
]
# The DTB is page aligned on AMD64 and I386 but aligned to 0x20
# on PAE kernels.
if self.session.kernel_address_space.metadata("pae"):
self.dtb_alignment = 0x20
else:
self.dtb_alignment = 0x1000
def scan(self, **kwargs):
for pool_obj in super(PoolScanProcess, self).scan(**kwargs):
# Also fetch freed objects.
for object_header in pool_obj.IterObject("Process", freed=True):
eprocess = object_header.Body.cast("_EPROCESS")
if eprocess.Pcb.DirectoryTableBase == 0:
continue
if eprocess.Pcb.DirectoryTableBase % self.dtb_alignment != 0:
continue
# Pointers must point to the kernel part of the address space.
list_head = eprocess.ActiveProcessLinks
if (list_head.Flink < self.kernel or
list_head.Blink < self.kernel):
continue
yield pool_obj, eprocess
class PSScan(common.WinScanner):
"""Scan Physical memory for _EPROCESS pool allocations.
Status flags:
E: A known _EPROCESS address from pslist.
P: A known pid from pslist.
"""
name = "psscan"
table_header = [
dict(name='a', width=1),
dict(name="offset_p", type="_EPROCESS"),
dict(name="offset_v", style="address"),
dict(name="ppid", width=6, align="r"),
dict(name="pdb", style="address"),
dict(name='stat', width=4),
dict(name="create_time", width=24),
dict(name="exit_time", width=24),
]
# Only bother to scan non paged pool by default.
scanner_defaults = dict(
scan_kernel_nonpaged_pool=True
)
def collect(self):
"""Render results in a table."""
# Try to do a regular process listing so we can compare if the process
# is known.
pslist = self.session.plugins.pslist()
# These are virtual addresses.
known_eprocess = set()
known_pids = set()
for task in pslist.list_eprocess():
known_eprocess.add(task)
known_pids.add(task.UniqueProcessId)
# Scan each requested run in turn.
for run in self.generate_memory_ranges():
# Just grab the AS and scan it using our scanner
scanner = PoolScanProcess(session=self.session,
profile=self.profile,
address_space=run.address_space)
for pool_obj, eprocess in scanner.scan(
offset=run.start, maxlen=run.length):
if run.data["type"] == "PhysicalAS":
# Switch address space from physical to virtual.
virtual_eprocess = (
pslist.virtual_process_from_physical_offset(eprocess))
else:
virtual_eprocess = eprocess
known = ""
if virtual_eprocess in known_eprocess:
known += "E"
if eprocess.UniqueProcessId in known_pids:
known += "P"
yield dict(a='F' if pool_obj.FreePool else "",
offset_p=eprocess,
offset_v=virtual_eprocess.obj_offset,
ppid=eprocess.InheritedFromUniqueProcessId,
pdb=eprocess.Pcb.DirectoryTableBase,
stat=known,
create_time=eprocess.CreateTime or '',
exit_time=eprocess.ExitTime or '')
|