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Automating DFIR - How to series on programming libtsk with python Part 8

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Automating DFIR - How to series on programming libtsk with python Part 8

Par Hacking Exposed Computer Forensics Blog
Le [2015-02-26] à 06:45:08



Présentation : Hello Reader, Welcome to part 8 of the Automating DFIR series, if this is the post your starting with... Stop You need to read all the prior parts or you will be really, really lost. There is a lot going on here and the better you understand it the easier it will all make sense to you, allowing you to done your wizard robe and hat of DFIR Wizardry Catch up on the part you left on below Part 1 - Accessing an image and printing the partition table Part 2 - Extracting a file from an image Part 3 - Extracting a file from a live system Part 4 - Turning a python script into a windows executable Part 5 - Auto escalating your python script to administrator Part 6 - Accessing an E01 image and extracting files Part 7 - Taking in command line options with argparse to specify an image Now that we have that out of the way for the new people, let's get back into the good stuff. One of the most common things we need to do, other than pulling a file out of an image, is to hash a file or files contained within an image. Let's start simply by just adding the hashing library that Python provides and generating some hashes for our MFTs. Then we'll work on making our script a bit more useful with some more command line options and much better intelligence. So to start with, as you may be expecting by now, we need to import a library. In Python 2.7 the library to import for hashing, that comes with Python, is called hashlib. So the first thing we need to do is import is as follows import hashlib You can read the documentation on hashlib here https docs.python.org 2 library hashlib.html module-hashlib Next we need to create a hashlib object to generate, store and print our hashes. Hashlib supports many different types of hashing and as of this post it supports md5, sha1, sha224, sha256, sha384, and sha512. When we create our hashlib option we do so while also choosing which of the hashing algorithms our object will use. For each hash algorithm you want to use you'll need a separate object. Let's start with MD5 by making the object and storing it in a variable called md5hash md5hash hashlib.md5 If we wanted to make a sha1 hashlib object we would just change the function at the end we are calling to sha1 and store it in a new variable, as follows sha1hash hashlib.sha1 If want to then generate a hash we would call the update function built into our hashlib object. When you call the update function you need to give it something to hash. You can give it a string or a variable that contains data to be hashed. In our program I am giving the object the contents of the MFT we read from the image whose data is being stored in the variable filedata. So the whole call looks like this md5hash.update filedata Similarly the call to generate the sha1 hash looks like this sha1hash.update filedata We've now generated md5 and sha1 hashes for the MFT we've extracted from the image, now we need to get the hashes printed so our user can see them.To do this we use the hexdigist method built into our hashlib object. The hexdigest function takes no arguments, it just prints in hex whatever hash value we last set with update. In this version of DFIR Wizard we are just going to print out the hash value to our command prompt window. It looks like this print MD5 Hash ,md5hash.hexdigest print SHA1 Hash ,sha1hash.hexdigest Taken all together the program looks like this usr bin python Sample program or step 6 in becoming a DFIR Wizard No license as this code is simple and free import sys import pytsk3 import datetime import pyewf import argparse import hashlib class ewf_Img_Info pytsk3.Img_Info def __init__ self, ewf_handle self._ewf_handle ewf_handle super ewf_Img_Info, self .__init__ url , type pytsk3.TSK_IMG_TYPE_EXTERNAL def close self self._ewf_handle.close def read self, offset, size self._ewf_handle.seek offset return self._ewf_handle.read size def get_size self return self._ewf_handle.get_media_size argparser argparse.ArgumentParser description 'Extract the MFT from all of the NTFS partitions of an E01' argparser.add_argument '-i', '--image', dest 'imagefile', action store , type str, default None, required True, help 'E01 to extract from' args argparser.parse_args filenames pyewf.glob args.imagefile ewf_handle pyewf.handle ewf_handle.open filenames imagehandle ewf_Img_Info ewf_handle partitionTable pytsk3.Volume_Info imagehandle for partition in partitionTable print partition.addr, partition.desc, pourcentsss pourcentss pourcents partition.start, partition.start 512 , partition.len if 'NTFS' in partition.desc filesystemObject pytsk3.FS_Info imagehandle, offset partition.start 512 fileobject filesystemObject.open MFT print File Inode ,fileobject.info.meta.addr print File Name ,fileobject.info.name.name print File Creation Time ,datetime.datetime.fromtimestamp fileobject.info.meta.crtime .strftime 'pourcentsY-pourcentsm-pourcentsd pourcentsH pourcentsM pourcentsS' outFileName str partition.addr fileobject.info.name.name print outFileName outfile open outFileName, 'w' filedata fileobject.read_random 0,fileobject.info.meta.size md5hash hashlib.md5 md5hash.update filedata print MD5 Hash ,md5hash.hexdigest sha1hash hashlib.sha1 sha1hash.update filedata print SHA1 Hash ,sha1hash.hexdigest outfile.write filedata outfile.close Pretty easy right When I run it I get the following C Users dave Desktoppython dfirwizard-v7.py -i SSFCC-Level5.E010 Primary Table 0 0s 0 11 Unallocated 0s 0 80642 NTFS 0x07 8064s 4128768 61759616File Inode 0File Name MFTFile Creation Time 2014-09-12 12 20 522 MFTMD5 Hash d91df0fb48c36f77a7a9c65870761bebSHA1 Hash 26213c341902111a68464020965e5fb50108730c Now the neat thing about the update method build into hashlib is that it will just keep adding to the hash the data you pass in. So if you wanted to buffer your reads, which we will do in a future part in the series, to prevent too much memory usage you can just pass the chunks to update as you read them and still get a hash for the complete file. You can get the source of this version of DFIR Wizard on the series github here https github.com dlcowen dfirwizard blob master dfirwizard-v7.py In the next part we are going to go into how to recurse through an entire image and hash all the files within it. Building up and bigger as our DFIR Wizard program continues to grow.

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Les derniers articles du site "Hacking Exposed Computer Forensics Blog" :

- Automating DFIR - How to series on programming libtsk with python Part 10
- Automating DFIR - How to series on programming libtsk with python Part 9
- Forensic Lunch 2 27 15 - Ben LeMere, Lee Whitfield and Robin Keir
- Automating DFIR - How to series on programming libtsk with python Part 8
- Automating DFIR - How to series on programming libtsk with python Part 7
- Automating DFIR - How to series on programming libtsk with python Part 6
- Automating DFIR - How to series on programming libtsk with python Part 5
- Automating DFIR - How to series on programming libtsk with python Part 4
- Automating DFIR - How to series on programming libtsk with python Part 3
- Automating DFIR - How to series on programming libtsk with python Part 2




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