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Automating DFIR - How to series on programming libtsk with python Part 3

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Automating DFIR - How to series on programming libtsk with python Part 3

Par Hacking Exposed Computer Forensics Blog
Le [2015-02-22] à 06:55:14



Présentation : Hello Reader, Before you read any farther make sure you have read part 1 and 2 as we are not going back over what we've already done. Part 1 Part 2 In the last post in this series we extracted a file from a forensic image, which is something you can start using to extract all sorts of data without having to load another tool. We are going to take a sideways step away from forensic images for one post and show how versatile this library is. So here is a question to make you think, what is the difference between a raw forensic image some call this a dd image of a hard drive and a live hard drive itself The answer, the live hard drive is changing but otherwise all of the structures are the same. This means the same library pytsk we are using to access a forensic image can be used to access the hard drive of a live running system If you are investigating a system, for whatever reason, and you want to A. Get access to locked files B. Access files the operating system won't show you C. Extract data without changing the metadata D. Carve a live system E. Write your own imaging program F. Anything else you can dream up Then this is the way to do it Many commercial vendors have offered solutions for doing this as 'triage' products and for the most part we can replicate all of their collection efforts using free and open source libraries. Do I have your interest Then let's go Let's start with our first program from part 1 and change one thing which is marked in bold below. usr bin python Sample program or step 1 in becoming a DFIR Wizard No license as this code is simple and free import sys import pytsk3 imagefile . PhysicalDrive0 imagehandle pytsk3.Img_Info imagefile partitionTable pytsk3.Volume_Info imagehandle for partition in partitionTable print partition.addr, partition.desc, pourcentsss pourcentss pourcents partition.start, partition.start 512 , partition.len Note For this to run you must execute it as administrator root on your system as you are accessing a raw physical disk. To do this in windows right click cmd.exe and say run as administrator. To do this in Linux or OSX make sure to run your script with sudo. If you were to run this on your own system right now it would print the partition table of the first drive in sequence. This code is interesting as the path I've given to a physical disk in the windows style, for Linux or OSX make sure to do a fdisk -l to find the path to the physical disks on your system. Now let's look at that code again and let this sink in. We didn't change any code to make the same program work on a live system then we did on a forensic image. The only thing we changed was the name of the file it was going to open and access like a forensic image and all the rest of our code worked That means that we can write one program that can operate on both live systems and forensic images which is pretty awesome if you stop and think about it. Now let's move forward from our sidestep and extend out our previous file extraction example to iterate through all the partitions on a live system and extract the MFT from it. For this example we are looking for MFT files so we only want to extract data from NTFS partitions on our live systems. To do this we need to add a line code right after we print our partition table to check to see if the partition description displayed to us contains the word NTFS. We can do this with an 'if' statement and the operating 'in'. if 'NTFS' in partition.desc So we are testing if our variable 'partition.desc' contains the word 'NTFS'. If it does than the next part of the code will execute, if it does not then it will execute any other conditionals relating to the if else if and else and then move on. Since for this example we are only testing for NTFS our code will just loop to the next partition if it is not NTFS. The next thing we need to do is to take out the hardcoded offset to the beginning of our partition that is in the FS_Info method we called in the previous example. We need to replace the hardcoded offset with the offset of whatever partition we just checked for containing NTFS. So instead of filesystemObject pytsk3.FS_Info imagehandle, offset 65536 we are going to replace it with variable we are printing out in the partition table, partition.start, which gives us the number of sectors into the disk we are looking at. Then we need to take that from sectors to absolute offset by multiplying the number of sectors by the sector size. I am going to assume here that you have a sector size of 512, if you don't change this number in your code, so I am going to multiply the number contained in partition.start by 512 to get the absolute offset where this partition begins. Lastly I need to make sure that the order of operations happens correctly so I will wrap this in a to note that the commands within it should be evaluated before proceeding. The end result looks like this filesystemObject pytsk3.FS_Info imagehandle, offset partition.start 512 Great Now we are iterating through and accessing all the NTFS partitions on our live system But wait, if we are doing this for multiple partitions we will be overwriting the contents of each prior partition with the next when we write out the data. The next change we have to make is changing the name of our output file to identify the partition number the file came from and the name of file we are extracting. To do this I am first making a new variable called outFileName which will contain the filename of the file we are writing out to. In order to combine the partition number and the filename together I am going to use the ' ' operator which will combine two strings together and return the combination. There is only one small thing left to fix, partition.addr which stores our partition number is not a string it is an integer. So in order to append it to a string using ' ' I need to tell python to treat it or 'cast it' as a string using the str function. The end result looks like this outFileName str partition.addr fileobject.info.name.name I now change our open command that opens our output file for writing to use this variable instead of the hardcoded file name we had before outfile open outFileName, 'w' and lastly since we are going to be reusing this file handle it would be wise to close it outfile.close and that's it We now have a program that will iterate though all the partitions on the 1st disk in your live system and extract the MFTs from every NTFS partition to uniquely named files The finished code looks like this usr bin python Sample program or step 3 in becoming a DFIR Wizard No license as this code is simple and free import sysimport pytsk3import datetimeimagefile . PhysicalDrive0 imagehandle pytsk3.Img_Info imagefile 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 You can download this post's code at the series Github here https github.com dlcowen dfirwizard blob master dfirwizard-v3.py If you wanted to do this against a forensic image just change the variable imagefile back to the forensic image you want it to extract from and all the rest of the code remains the same. In the next part in this series we will make it so you can specify where to extract from and how to turn your python script into a standalone executable so you don't have to have python on the system you want to run your program on.

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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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