mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
Andrew C
228 lines
7.8 KiB
Python
228 lines
7.8 KiB
Python
# Volatility
|
|
# Copyright (C) 2007-2013 Volatility Foundation
|
|
#
|
|
# 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 as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# 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/>.
|
|
#
|
|
|
|
"""
|
|
@author: Andrew Case
|
|
@license: GNU General Public License 2.0
|
|
@contact: atcuno@gmail.com
|
|
@organization:
|
|
"""
|
|
|
|
import volatility.obj as obj
|
|
import volatility.plugins.mac.pstasks as pstasks
|
|
import volatility.plugins.mac.common as common
|
|
|
|
import distorm3
|
|
|
|
class mac_apihooks(pstasks.mac_tasks):
|
|
""" Checks for API hooks in processes """
|
|
|
|
def __init__(self, config, *args, **kwargs):
|
|
self.mapping_cache = {}
|
|
|
|
pstasks.mac_tasks.__init__(self, config, *args, **kwargs)
|
|
|
|
def _is_api_hooked(self, sym_addr, proc_as):
|
|
hook_type = None
|
|
addr = None
|
|
counter = 1
|
|
prev_op = None
|
|
|
|
if self.profile.metadata.get('memory_model', '32bit') == '32bit':
|
|
mode = distorm3.Decode32Bits
|
|
else:
|
|
mode = distorm3.Decode64Bits
|
|
|
|
data = proc_as.read(sym_addr, 24)
|
|
|
|
for op in distorm3.Decompose(sym_addr, data, mode):
|
|
if not op or not op.valid:
|
|
continue
|
|
|
|
if op.mnemonic == "JMP":
|
|
hook_type = "JMP"
|
|
addr = 0 # default in case we cannot extract
|
|
|
|
# check for a mov reg, addr; jmp reg;
|
|
if prev_op and prev_op.mnemonic == "MOV" and prev_op.operands[0].type == 'Register' and op.operands[0].type == 'Register':
|
|
prev_name = prev_op.operands[0].name
|
|
|
|
# same register
|
|
if prev_name == op.operands[0].name:
|
|
addr = prev_op.operands[1].value
|
|
|
|
else:
|
|
addr = op.operands[0].value
|
|
|
|
elif op.mnemonic == "CALL":
|
|
hook_type = "CALL"
|
|
addr = op.operands[0].value
|
|
|
|
# push xxxx; ret;
|
|
elif counter == 2 and op.mnemonic == "RET":
|
|
if prev_op.mnemonic == "MOV" and prev_op.operands[0].type == 'Register' and prev_op.operands[0].name in ["RAX", "EAX"]:
|
|
break
|
|
|
|
elif prev_op.mnemonic == "XOR" and prev_op.operands[0].type == 'Register' and prev_op.operands[1].type == 'Register':
|
|
break
|
|
|
|
elif prev_op.mnemonic == "MOV" and prev_op.operands[0].type == 'Register' and prev_op.operands[1].type == 'Register':
|
|
break
|
|
|
|
hook_type = "RET"
|
|
addr = sym_addr
|
|
|
|
if hook_type:
|
|
break
|
|
|
|
counter = counter + 1
|
|
if counter == 4:
|
|
break
|
|
|
|
prev_op = op
|
|
|
|
if hook_type:
|
|
ret = hook_type, addr
|
|
else:
|
|
ret = None
|
|
|
|
return ret
|
|
|
|
def _fill_mapping_cache(self, proc):
|
|
proc_as = proc.get_process_address_space()
|
|
|
|
self.mapping_cache[proc.v()] = {}
|
|
|
|
ranges = []
|
|
|
|
for mapping in proc.get_dyld_maps():
|
|
m = obj.Object("macho_header", offset = mapping.imageLoadAddress, vm = proc_as)
|
|
|
|
for seg in m.segments():
|
|
ranges.append((mapping.imageFilePath, seg.vmaddr, seg.vmaddr + seg.vmsize))
|
|
|
|
self.mapping_cache[proc.v()] = ranges
|
|
|
|
def _find_mapping(self, proc, addr):
|
|
ret = None
|
|
|
|
if not proc.v() in self.mapping_cache:
|
|
self._fill_mapping_cache(proc)
|
|
|
|
mappings = self.mapping_cache[proc.v()]
|
|
|
|
for (path, start, end) in mappings:
|
|
if start <= addr <= end:
|
|
ret = (path, start, end)
|
|
break
|
|
|
|
return ret
|
|
|
|
def _find_mapping_proc_maps(self, proc, addr):
|
|
ret = None
|
|
|
|
for mapping in proc.get_proc_maps():
|
|
if mapping.start <= addr <= mapping.end:
|
|
ret = (mapping.get_path(), mapping.start, mapping.end)
|
|
|
|
return ret
|
|
|
|
def calculate(self):
|
|
common.set_plugin_members(self)
|
|
|
|
procs = pstasks.mac_tasks(self._config).calculate()
|
|
|
|
for proc in procs:
|
|
proc_as = proc.get_process_address_space()
|
|
|
|
for mapping in proc.get_dyld_maps():
|
|
path = mapping.imageFilePath
|
|
|
|
macho = obj.Object("macho_header", offset = mapping.imageLoadAddress, vm = proc_as)
|
|
|
|
needed_libraries = {}
|
|
for n in macho.needed_libraries():
|
|
needed_libraries[n] = 1
|
|
|
|
for (name, addr) in macho.imports():
|
|
is_lazy = False
|
|
is_ptr_hooked = False
|
|
is_api_hooked = False
|
|
hook_addr = 0
|
|
hook_type = ""
|
|
|
|
vma_mapping = self._find_mapping(proc, addr)
|
|
if vma_mapping == None:
|
|
vma_mapping = self._find_mapping_proc_maps(proc, addr)
|
|
|
|
(vma_path, vma_start, vma_end) = vma_mapping
|
|
|
|
addr_mapping = vma_path
|
|
|
|
# non-resolved symbols
|
|
if vma_start <= mapping.imageLoadAddress <= vma_end:
|
|
is_lazy = True
|
|
else:
|
|
is_ptr_hooked = not addr_mapping in needed_libraries
|
|
|
|
# check if pointing into the shared region
|
|
# this happens as libraries in the region are not listed as needed
|
|
if is_ptr_hooked:
|
|
if proc.task.shared_region.sr_base_address <= addr <= proc.task.shared_region.sr_base_address + proc.task.shared_region.sr_size:
|
|
is_ptr_hooked = False
|
|
|
|
if not is_ptr_hooked:
|
|
is_api_hooked = self._is_api_hooked(addr, proc_as)
|
|
if is_api_hooked:
|
|
(hook_type, hook_addr) = is_api_hooked
|
|
|
|
yield (proc, name, addr, is_lazy, is_ptr_hooked, is_api_hooked, hook_type, hook_addr, addr_mapping)
|
|
|
|
def render_text(self, outfd, data):
|
|
self.table_header(outfd, [("Name", "16"),
|
|
("PID", "6"),
|
|
("Symbol", "25"),
|
|
("Sym Address", "[addrpad]"),
|
|
("Lazy", "5"),
|
|
("Ptr Hook", "6"),
|
|
("API Hook", "6"),
|
|
("Hook Type", "6"),
|
|
("Hook Addr", "[addrpad]"),
|
|
("Hook Library", ""),
|
|
])
|
|
|
|
for (task, name, addr, is_lazy, is_ptr_hooked, is_api_hooked, hook_type, hook_addr, addr_mapping) in data:
|
|
if is_lazy:
|
|
is_lazy = "True"
|
|
else:
|
|
is_lazy = "False"
|
|
|
|
if is_ptr_hooked:
|
|
is_ptr_hooked = "True"
|
|
else:
|
|
is_ptr_hooked = "False"
|
|
|
|
if is_api_hooked:
|
|
is_api_hooked = "True"
|
|
else:
|
|
is_api_hooked = "False"
|
|
|
|
self.table_row(outfd, task.p_comm, task.p_pid, name, addr, is_lazy, is_ptr_hooked, is_api_hooked, hook_type, hook_addr, addr_mapping)
|
|
|