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#!/usr/bin/env python
# This file is part of python-evtx.
#
# Copyright 2012, 2013 Willi Ballenthin <william.ballenthin@mandiant.com>
# while at Mandiant <http://www.mandiant.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Version v0.1
import sys
import binascii
import mmap
import contextlib
from Evtx.Evtx import FileHeader
def main():
with open(sys.argv[1], 'r') as f:
with contextlib.closing(mmap.mmap(f.fileno(), 0,
access=mmap.ACCESS_READ)) as buf:
fh = FileHeader(buf, 0x0)
print("Information from file header:")
print(("Format version : %d.%d" % (fh.major_version(),
fh.minor_version())))
print(("Flags : 0x%08x" % (fh.flags())))
dirty_string = "clean"
if fh.is_dirty():
dirty_string = "dirty"
print(("File is : %s" % (dirty_string)))
full_string = "no"
if fh.is_full():
full_string = "yes"
print(("Log is full : %s" % (full_string)))
print(("Current chunk : %d of %d" % (fh.current_chunk_number(),
fh.chunk_count())))
print(("Oldest chunk : %d" % (fh.oldest_chunk() + 1)))
print(("Next record# : %d" % (fh.next_record_number())))
checksum_string = "fail"
if fh.calculate_checksum() == fh.checksum():
checksum_string = "pass"
print(("Check sum : %s" % (checksum_string)))
print("")
if fh.is_dirty():
chunk_count = sum([1 for c in fh.chunks() if c.verify()])
last_chunk = None
for chunk in fh.chunks():
if not chunk.verify():
continue
last_chunk = chunk
next_record_num = last_chunk.log_last_record_number() + 1
print("Suspected updated header values (header is dirty):")
print(("Current chunk : %d of %d" % (chunk_count,
chunk_count)))
print(("Next record# : %d" % (next_record_num)))
print("")
print("Information from chunks:")
print(" Chunk file (first/last) log (first/last) Header Data")
print("- ----- --------------------- --------------------- ------ ------")
for (i, chunk) in enumerate(fh.chunks(), 1):
note_string = " "
if i == fh.current_chunk_number() + 1:
note_string = "*"
elif i == fh.oldest_chunk() + 1:
note_string = ">"
if not chunk.check_magic():
if chunk.magic() == "\x00\x00\x00\x00\x00\x00\x00\x00":
print("%s %4d [EMPTY]" % (note_string, i))
else:
print("%s %4d [INVALID]" % (note_string, i))
continue
header_checksum_string = "fail"
if chunk.calculate_header_checksum() == chunk.header_checksum():
header_checksum_string = "pass"
data_checksum_string = "fail"
if chunk.calculate_data_checksum() == chunk.data_checksum():
data_checksum_string = "pass"
print("%s %4d %8d %8d %8d %8d %s %s" % \
(note_string,
i,
chunk.file_first_record_number(),
chunk.file_last_record_number(),
chunk.log_first_record_number(),
chunk.log_last_record_number(),
header_checksum_string,
data_checksum_string))
if __name__ == "__main__":
main()
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