def csv_user_assist_value_decode_before_win7(str_value_datatmp, count_offset):
"""
The Count registry key contains values representing the programs
Each value is separated as :
first 4 bytes are session
following 4 bytes are number of times the program has been run
next 8 bytes are the timestamp of last execution
each of those values are in big endian which have to be converted in little endian
:return: An array containing these information
"""
# 16 bytes data
str_value_data_session = str_value_datatmp[0:4]
str_value_data_session = unicode(get_int_from_reversed_string(str_value_data_session))
str_value_data_count = str_value_datatmp[4:8]
str_value_data_count = unicode(get_int_from_reversed_string(str_value_data_count) + count_offset + 1)
str_value_data_timestamp = str_value_datatmp[8:16]
try:
timestamp = get_int_from_reversed_string(str_value_data_timestamp)
date_last_exec = convert_windate(timestamp)
except ValueError:
date_last_exec = None
arr_data = [str_value_data_session, str_value_data_count]
if date_last_exec:
arr_data.append(date_last_exec)
else:
arr_data.append("")
return arr_data
def __decode_section_a(self, format_version, content, section_a):
hash_table = dict()
if format_version == 17:
hash_table['start_time'] = get_int_from_reversed_string(content[section_a:section_a + 4])
hash_table['duration'] = get_int_from_reversed_string(content[section_a + 4:section_a + 4 + 4])
hash_table['average_duration'] = ''
hash_table['filename_offset'] = get_int_from_reversed_string(content[section_a + 8:section_a + 8 + 4])
hash_table['filename_nb_char'] = get_int_from_reversed_string(content[section_a + 12:section_a + 12 + 4])
else:
hash_table['start_time'] = get_int_from_reversed_string(content[section_a:section_a + 4])
hash_table['duration'] = get_int_from_reversed_string(content[section_a + 4:section_a + 4 + 4])
hash_table['average_duration'] = get_int_from_reversed_string(content[section_a + 8:section_a + 8 + 4])
hash_table['filename_offset'] = get_int_from_reversed_string(content[section_a + 12:section_a + 12 + 4])
hash_table['filename_nb_char'] = get_int_from_reversed_string(content[section_a + 16:section_a + 16 + 4])
return hash_table
def csv_user_assist_value_decode_win7_and_after(str_value_datatmp, count_offset):
"""The value in user assist has changed since Win7. It is taken into account here."""
# 16 bytes data
str_value_data_session = str_value_datatmp[0:4]
str_value_data_session = unicode(get_int_from_reversed_string(str_value_data_session))
str_value_data_count = str_value_datatmp[4:8]
str_value_data_count = unicode(get_int_from_reversed_string(str_value_data_count) + count_offset + 1)
str_value_data_focus = str_value_datatmp[12:16]
str_value_data_focus = unicode(get_int_from_reversed_string(str_value_data_focus))
str_value_data_timestamp = str_value_datatmp[60:68]
try:
timestamp = get_int_from_reversed_string(str_value_data_timestamp)
date_last_exec = convert_windate(timestamp)
except ValueError:
date_last_exec = None
arr_data = [str_value_data_session, str_value_data_count, str_value_data_focus]
if date_last_exec:
arr_data.append(date_last_exec)
else:
arr_data.append("")
return arr_data
def __decode_section_a(self, format_version, content, section_a):
hash_table = dict()
if format_version == 17:
hash_table['start_time'] = get_int_from_reversed_string(
content[section_a:section_a + 4])
hash_table['duration'] = get_int_from_reversed_string(
content[section_a + 4:section_a + 4 + 4])
hash_table['average_duration'] = ''
hash_table['filename_offset'] = get_int_from_reversed_string(
content[section_a + 8:section_a + 8 + 4])
hash_table['filename_nb_char'] = get_int_from_reversed_string(
content[section_a + 12:section_a + 12 + 4])
else:
hash_table['start_time'] = get_int_from_reversed_string(
content[section_a:section_a + 4])
hash_table['duration'] = get_int_from_reversed_string(
content[section_a + 4:section_a + 4 + 4])
hash_table['average_duration'] = get_int_from_reversed_string(
content[section_a + 8:section_a + 8 + 4])
hash_table['filename_offset'] = get_int_from_reversed_string(
content[section_a + 12:section_a + 12 + 4])
hash_table['filename_nb_char'] = get_int_from_reversed_string(
content[section_a + 16:section_a + 16 + 4])
return hash_table
def _list_windows_prefetch(self):
"""Outputs windows prefetch files in a csv"""
"""See http://www.forensicswiki.org/wiki/Windows_Prefetch_File_Format"""
prefetch_path = self.systemroot + '\Prefetch\*.pf'
list_prefetch_files = look_for_files(prefetch_path)
for prefetch_file in list_prefetch_files:
content = ''
with open(prefetch_file, 'rb') as file_input:
content = file_input.read()
try:
format_version = content[:4]
format_version = get_int_from_reversed_string(format_version)
# scca_sig = content[0x4:][:4]
unknown_values = content[0x0008:0x0008 + 4]
unknown_values = ' '.join(c.encode('hex') for c in unknown_values)
file_size = content[0x000c:0x000c + 4]
file_size = get_int_from_reversed_string(file_size)
exec_name = content[0x0010:0x0010 + 60]
for i in range(30): # 60 / 2
if 2 * i + 1 < len(exec_name):
if exec_name[2 * i] == '\x00' and exec_name[2 * i + 1] == '\x00':
exec_name = exec_name[:2 * (i + 1)].decode('utf-16-le')
prefetch_hash = content[0x004c:0x004c + 4]
tc = os.path.getctime(prefetch_file)
tm = os.path.getmtime(prefetch_file)
section_a = get_int_from_reversed_string(content[0x0054:0x0054 + 4])
num_entries_a = get_int_from_reversed_string(content[0x0058:0x0058 + 4])
section_b = get_int_from_reversed_string(content[0x005c:0x005c + 4])
num_entries_b = get_int_from_reversed_string(content[0x0060:0x0060 + 4])
section_c = get_int_from_reversed_string(content[0x0064:0x0064 + 4])
length_c = get_int_from_reversed_string(content[0x0068:0x0068 + 4])
section_d = get_int_from_reversed_string(content[0x006c:0x006c + 4])
num_entries_d = get_int_from_reversed_string(content[0x0070:0x0070 + 4])
length_d = get_int_from_reversed_string(content[0x0074:0x0074 + 4])
if format_version == 17:
latest_exec_date = content[0x0078:0x0078 + 8]
exec_count = get_int_from_reversed_string(content[0x0090:0x0090 + 4])
# section a
elif format_version == 23:
latest_exec_date = content[0x0080:0x0080 + 8]
exec_count = get_int_from_reversed_string(content[0x0098:0x0098 + 4])
else:
# format version 26
latest_exec_date = []
for i in range(8):
latest_exec_date.append(content[0x0088 + i * 8:0x0088 + (i + 1) * 8])
exec_count = get_int_from_reversed_string(content[0x00D0:0x00D0 + 4])
hash_table_a = self.__decode_section_a(format_version, content, section_a)
list_str_c = self.__decode_section_c(content, section_c, length_c)
yield prefetch_file, format_version, file_size, exec_name, datetime.datetime.fromtimestamp(
tc), datetime.datetime.fromtimestamp(tm), exec_count, hash_table_a, list_str_c
except:
logging.error(traceback.format_exc())
def _list_windows_prefetch(self, is_compressed=False):
"""Outputs windows prefetch files in a csv"""
"""See http://www.forensicswiki.org/wiki/Windows_Prefetch_File_Format"""
prefetch_path = self.systemroot + '\Prefetch\*.pf'
list_prefetch_files = look_for_files(prefetch_path)
for prefetch_file in list_prefetch_files:
content = ''
with open(prefetch_file, 'rb') as file_input:
content = file_input.read()
try:
if is_compressed:
header = content[:8]
content = content[8:]
signature, uncompressed_size = struct.unpack('<LL', header)
algo = (signature & 0x0F000000) >> 24
RtlDecompressBufferEx = ctypes.windll.ntdll.RtlDecompressBufferEx
RtlGetCompressionWorkSpaceSize = ctypes.windll.ntdll.RtlGetCompressionWorkSpaceSize
CompressBufferWorkSpaceSize = ctypes.c_uint32()
CompressFragmentWorkSpaceSize = ctypes.c_uint32()
RtlGetCompressionWorkSpaceSize(
algo, ctypes.byref(CompressBufferWorkSpaceSize),
ctypes.byref(CompressFragmentWorkSpaceSize))
Compressed = (ctypes.c_ubyte *
len(content)).from_buffer_copy(content)
Uncompressed = (ctypes.c_ubyte * uncompressed_size)()
FinalUncompressedSize = ctypes.c_uint32()
Workspace = (ctypes.c_ubyte *
CompressFragmentWorkSpaceSize.value)()
ntstatus = RtlDecompressBufferEx(
ctypes.c_uint16(algo), ctypes.byref(Uncompressed),
ctypes.c_uint32(uncompressed_size),
ctypes.byref(Compressed),
ctypes.c_uint32(len(content)),
ctypes.byref(FinalUncompressedSize),
ctypes.byref(Workspace))
uncompressed = list(Uncompressed)
content = b"".join([chr(c) for c in uncompressed])
format_version = content[:4]
format_version = get_int_from_reversed_string(format_version)
# scca_sig = content[0x4:][:4]
unknown_values = content[0x0008:0x0008 + 4]
unknown_values = ' '.join(
c.encode('hex') for c in unknown_values)
file_size = content[0x000c:0x000c + 4]
file_size = get_int_from_reversed_string(file_size)
exec_name = content[0x0010:0x0010 + 60]
for i in range(30): # 60 / 2
if 2 * i + 1 < len(exec_name):
if exec_name[2 *
i] == '\x00' and exec_name[2 * i +
1] == '\x00':
exec_name = exec_name[:2 *
(i + 1)].decode('utf-16-le')
prefetch_hash = content[0x004c:0x004c + 4]
tc = os.path.getctime(prefetch_file)
tm = os.path.getmtime(prefetch_file)
section_a = get_int_from_reversed_string(
content[0x0054:0x0054 + 4])
num_entries_a = get_int_from_reversed_string(
content[0x0058:0x0058 + 4])
section_b = get_int_from_reversed_string(
content[0x005c:0x005c + 4])
num_entries_b = get_int_from_reversed_string(
content[0x0060:0x0060 + 4])
section_c = get_int_from_reversed_string(
content[0x0064:0x0064 + 4])
length_c = get_int_from_reversed_string(content[0x0068:0x0068 +
4])
section_d = get_int_from_reversed_string(
content[0x006c:0x006c + 4])
num_entries_d = get_int_from_reversed_string(
content[0x0070:0x0070 + 4])
length_d = get_int_from_reversed_string(content[0x0074:0x0074 +
4])
if format_version == 17:
latest_exec_date = content[0x0078:0x0078 + 8]
exec_count = get_int_from_reversed_string(
content[0x0090:0x0090 + 4])
# section a
elif format_version == 23:
latest_exec_date = content[0x0080:0x0080 + 8]
exec_count = get_int_from_reversed_string(
content[0x0098:0x0098 + 4])
else:
# format version 26
latest_exec_date = []
for i in range(8):
latest_exec_date.append(content[0x0088 + i * 8:0x0088 +
(i + 1) * 8])
exec_count = get_int_from_reversed_string(
content[0x00D0:0x00D0 + 4])
hash_table_a = self.__decode_section_a(format_version, content,
section_a)
list_str_c = self.__decode_section_c(content, section_c,
length_c)
yield prefetch_file, format_version, file_size, exec_name, datetime.datetime.fromtimestamp(
tc), datetime.datetime.fromtimestamp(
tm), exec_count, hash_table_a, list_str_c
except:
logging.error(traceback.format_exc())
def _list_windows_prefetch(self):
"""Outputs windows prefetch files in a csv"""
"""See http://www.forensicswiki.org/wiki/Windows_Prefetch_File_Format"""
prefetch_path = self.systemroot + '\Prefetch\*.pf'
list_prefetch_files = look_for_files(prefetch_path)
for prefetch_file in list_prefetch_files:
content = ''
with open(prefetch_file, 'rb') as file_input:
content = file_input.read()
try:
format_version = content[:4]
format_version = get_int_from_reversed_string(format_version)
# scca_sig = content[0x4:][:4]
unknown_values = content[0x0008:0x0008 + 4]
unknown_values = ' '.join(
c.encode('hex') for c in unknown_values)
file_size = content[0x000c:0x000c + 4]
file_size = get_int_from_reversed_string(file_size)
exec_name = content[0x0010:0x0010 + 60]
for i in range(30): # 60 / 2
if 2 * i + 1 < len(exec_name):
if exec_name[2 *
i] == '\x00' and exec_name[2 * i +
1] == '\x00':
exec_name = exec_name[:2 *
(i + 1)].decode('utf-16-le')
prefetch_hash = content[0x004c:0x004c + 4]
tc = os.path.getctime(prefetch_file)
tm = os.path.getmtime(prefetch_file)
section_a = get_int_from_reversed_string(
content[0x0054:0x0054 + 4])
num_entries_a = get_int_from_reversed_string(
content[0x0058:0x0058 + 4])
section_b = get_int_from_reversed_string(
content[0x005c:0x005c + 4])
num_entries_b = get_int_from_reversed_string(
content[0x0060:0x0060 + 4])
section_c = get_int_from_reversed_string(
content[0x0064:0x0064 + 4])
length_c = get_int_from_reversed_string(content[0x0068:0x0068 +
4])
section_d = get_int_from_reversed_string(
content[0x006c:0x006c + 4])
num_entries_d = get_int_from_reversed_string(
content[0x0070:0x0070 + 4])
length_d = get_int_from_reversed_string(content[0x0074:0x0074 +
4])
if format_version == 17:
latest_exec_date = content[0x0078:0x0078 + 8]
exec_count = get_int_from_reversed_string(
content[0x0090:0x0090 + 4])
# section a
elif format_version == 23:
latest_exec_date = content[0x0080:0x0080 + 8]
exec_count = get_int_from_reversed_string(
content[0x0098:0x0098 + 4])
else:
# format version 26
latest_exec_date = []
for i in range(8):
latest_exec_date.append(content[0x0088 + i * 8:0x0088 +
(i + 1) * 8])
exec_count = get_int_from_reversed_string(
content[0x00D0:0x00D0 + 4])
hash_table_a = self.__decode_section_a(format_version, content,
section_a)
list_str_c = self.__decode_section_c(content, section_c,
length_c)
yield prefetch_file, format_version, file_size, exec_name, datetime.datetime.fromtimestamp(
tc), datetime.datetime.fromtimestamp(
tm), exec_count, hash_table_a, list_str_c
except:
logging.error(traceback.format_exc())
def _list_windows_prefetch(self, is_compressed=False):
"""Outputs windows prefetch files in a csv"""
"""See http://www.forensicswiki.org/wiki/Windows_Prefetch_File_Format"""
prefetch_path = self.systemroot + '\Prefetch\*.pf'
list_prefetch_files = look_for_files(prefetch_path)
for prefetch_file in list_prefetch_files:
content = ''
with open(prefetch_file, 'rb') as file_input:
content = file_input.read()
try:
if is_compressed:
header = content[:8]
content = content[8:]
signature, uncompressed_size = struct.unpack('<LL', header)
algo = (signature & 0x0F000000) >> 24
RtlDecompressBufferEx = ctypes.windll.ntdll.RtlDecompressBufferEx
RtlGetCompressionWorkSpaceSize = ctypes.windll.ntdll.RtlGetCompressionWorkSpaceSize
CompressBufferWorkSpaceSize = ctypes.c_uint32()
CompressFragmentWorkSpaceSize = ctypes.c_uint32()
RtlGetCompressionWorkSpaceSize(algo, ctypes.byref(CompressBufferWorkSpaceSize),
ctypes.byref(CompressFragmentWorkSpaceSize))
Compressed = (ctypes.c_ubyte * len(content)).from_buffer_copy(content)
Uncompressed = (ctypes.c_ubyte * uncompressed_size)()
FinalUncompressedSize = ctypes.c_uint32()
Workspace = (ctypes.c_ubyte * CompressFragmentWorkSpaceSize.value)()
ntstatus = RtlDecompressBufferEx(
ctypes.c_uint16(algo),
ctypes.byref(Uncompressed),
ctypes.c_uint32(uncompressed_size),
ctypes.byref(Compressed),
ctypes.c_uint32(len(content)),
ctypes.byref(FinalUncompressedSize),
ctypes.byref(Workspace))
uncompressed = list(Uncompressed)
content = b"".join([chr(c) for c in uncompressed])
format_version = content[:4]
format_version = get_int_from_reversed_string(format_version)
# scca_sig = content[0x4:][:4]
unknown_values = content[0x0008:0x0008 + 4]
unknown_values = ' '.join(c.encode('hex') for c in unknown_values)
file_size = content[0x000c:0x000c + 4]
file_size = get_int_from_reversed_string(file_size)
exec_name = content[0x0010:0x0010 + 60]
for i in range(30): # 60 / 2
if 2 * i + 1 < len(exec_name):
if exec_name[2 * i] == '\x00' and exec_name[2 * i + 1] == '\x00':
exec_name = exec_name[:2 * (i + 1)].decode('utf-16-le')
prefetch_hash = content[0x004c:0x004c + 4]
tc = os.path.getctime(prefetch_file)
tm = os.path.getmtime(prefetch_file)
section_a = get_int_from_reversed_string(content[0x0054:0x0054 + 4])
num_entries_a = get_int_from_reversed_string(content[0x0058:0x0058 + 4])
section_b = get_int_from_reversed_string(content[0x005c:0x005c + 4])
num_entries_b = get_int_from_reversed_string(content[0x0060:0x0060 + 4])
section_c = get_int_from_reversed_string(content[0x0064:0x0064 + 4])
length_c = get_int_from_reversed_string(content[0x0068:0x0068 + 4])
section_d = get_int_from_reversed_string(content[0x006c:0x006c + 4])
num_entries_d = get_int_from_reversed_string(content[0x0070:0x0070 + 4])
length_d = get_int_from_reversed_string(content[0x0074:0x0074 + 4])
if format_version == 17:
latest_exec_date = content[0x0078:0x0078 + 8]
exec_count = get_int_from_reversed_string(content[0x0090:0x0090 + 4])
# section a
elif format_version == 23:
latest_exec_date = content[0x0080:0x0080 + 8]
exec_count = get_int_from_reversed_string(content[0x0098:0x0098 + 4])
else:
# format version 26
latest_exec_date = []
for i in range(8):
latest_exec_date.append(content[0x0088 + i * 8:0x0088 + (i + 1) * 8])
exec_count = get_int_from_reversed_string(content[0x00D0:0x00D0 + 4])
hash_table_a = self.__decode_section_a(format_version, content, section_a)
list_str_c = self.__decode_section_c(content, section_c, length_c)
yield prefetch_file, format_version, file_size, exec_name, datetime.datetime.fromtimestamp(
tc), datetime.datetime.fromtimestamp(tm), exec_count, hash_table_a, list_str_c
except:
logging.error(traceback.format_exc())
