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Automating DFIR - How to series on programming libtsk with python Part 7

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Automating DFIR - How to series on programming libtsk with python Part 7

Par Hacking Exposed Computer Forensics Blog
Le [2015-02-25] à 05:58:36



Présentation : Hello Reader, We've reached the seventh part of our series and we are starting to ramp up on our dfir wizardry If you are just starting here, don't. Please start at Part 1 unless you already have a lot of experience both with Python AND with pytsk pyewf. 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 When last I left you we extract files from an E01 image. This is great but our script is still hard coding in the name of the image to access, so it's time to to start adding command line arguments and parsing to start making our DFIR Wizard program more flexible. Python makes this easy with a standard library named 'argparse' which not only will allow us to handle advanced command line arguments but it will also make usage instructions for us. If you want to read the documentation on argparse go here https docs.python.org 2.7 library argparse.html We start by importing the argparse library, importing libraries is something you should be very familiar with by now. import argparse Next we need to create an argparse object by calling the ArgumentParser function, providing a description of what our program does and then storing the result in a variable named argparser. The description of our program we place into the description parameter we pass in will be used in the auto generation of help and usage instructions. The more you put, the more the user knows. In the end the argparse object creation will look like this argparser argparse.ArgumentParser description 'Extract the MFT from all of the NTFS partitions of an E01' For every argument we want to pass in from the command line and handle we need to use the add_argument function that we invoke from our argparser object. There are a lot of options you can choose from when you use add_argument and we are going to take advance of a couple of them. See below for how this will look and then we will go into what the parameters mean argparser.add_argument '-i', '--image', dest 'imagefile', action store , type str, default None, required True, help 'E01 to extract from' The first thing you specify if what, if any, option you want to identify this argument as. For our script we are defining this argument to be set if the user passes in -i or the long form --image. Next we need to tell add_argument what variable to store the parsed argument into, we are going to put it into a variable named imagefile. Next we need to tell the parser what to do with data passed to this argument, in this case we want to store it. Next we need tell the parser what type of variable we want to store this as, in this case we want to store it as a string. Next we can set a default value of we would like, but we don't have a default named forensic image. The next argument is important as we specify if an argument is required for the program to continue executing. If you don't provide a required argument then the program will print the usage instructions for the program, generated by argparse, and then quit. The last option we are specifying here is the help option which will print whatever description we put here in the usage information. Now that we have defined our argument we have to tell argparse to parse the arguments that have been passed in by calling the parse_args function from our argparser object and then assign the object it returns of parsed arguments to a variable. In our program we have called that variable args and we will use it to access any arguments parsed. args argparser.parse_args One more change and we are done, we need to change our code to remove the harcoded image name and replace it with args.imagefile which contains the name of the image the user specified with -i or --image. filenames pyewf.glob args.imagefile That's it We can specify at execution what E01 image file we want to extract the MFT from. The final 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 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 outfile.write filedata outfile.close The final program can be downloaded from out series Github here   https github.com dlcowen dfirwizard blob master dfirwizard-v6.py In future posts we'll change our program so that the user can specify a live disk, raw image or other image types but one step at a time. In part 8 we will start hashing files, which is something all of us have to do at one time or another. 

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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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