Presentation on theme: "2012. Provides the backstory behind the crime Provides pertinent information related to the motive behind the crime Requires the use of 2 software packages:"— Presentation transcript:
Provides the backstory behind the crime Provides pertinent information related to the motive behind the crime Requires the use of 2 software packages: Forensics Tool Kit (FTK) Version or S-Tools Software must be downloaded on your laptop prior to the competition
1. Creating & Opening a Computer Forensics Case 2. Finding Hidden Data in Slack Space or Unallocated Space 3. Finding a Recently Deleted File 4. Finding a File with an Improper File Extension 5. Finding a Stegod Image or Data Hidden in a JPG File
How you do it? A.Start FTK and Create a New Case B.Add evidence C.Save the case on exiting Once created you only need to start FTK and open an existing file to continue working on the case
A case represents an incident You will need to supply: Name or number of Case Investigators name Evidence to be added to the case New cases can be Created You can Open existing cases previously created
Should run in administrator mode Right-click FTK icon and select run as administrator Or… click properties, and select appropriate option for icon (then you wont need to repeat each FTK startup) You may receive a prompt looking for security device Its OK to run without the dongle or security device USB dongle is required to run FTK in Full Mode Also might ask for Code Meter Were running in Demo Mode Limits us to 5,000 files in the case, but otherwise fully functional!
Known File Filter Used to ignore Known Files OK to load FTK without KFF
Select the appropriate option Generally youll either be creating new case or opening an existing case
Enter Captions for Case Number I chose LIPD Long Island Police Dept., Case 1 of 2012 Case Name Something meaningful Case Path The folder where case saved on hard drive The default is the case name
Enter information about investigator Next screen Case Log Options Select all options Next screen Processes to perform Keep default values Next screen Refine case Accept defaults Next screen Refine index Accept defaults Next screen
Click Add Evidence
Information to be added to the Case Acquired forensic image of Drive This is a single file, but contains contents of an entire drive!!! Similar to a zip file Also referred to as image file Bitstream file Bit-for-bit image file This image file is captured and produced by some forensic software or utility program Viewed with forensic software which understands the file structure It is NOT the same as a GIF or JPEG, which is a PICTURE type of image file and IS a single file Local Drive (not on CSI 2012) Attached to the system and addressable as a disk drive For example, the C: or E: disk Could include a CD, DVD, USB, etc.. Contents of a Folder Individual File
Created earlier by someone using Utility program or Forensic software Hard Drive Image files captured earlier *.img ending added by creator Other endings dependent on software used to create them
Fill in captions Evidence Name/Number For example, an item number of the evidence list Serial number, if unique Comments (optional) How acquired or unusual circumstances, etc.. Local Evidence Time Zone -05:00 for NY timezone Dont forget about Daylight Savings, if it applies! Used for time comparisons All Evidence Added. Click Next
After clicking Finish FTK will Process Files Add them to the case
As part of adding evidence FTK will Keep track of certain items and summarize them Build an index of words or terms encountered Can be used to short-cut a search Can be used to identify words in the entire case Might provide insight into something not normally considered For example, seeing gun, secret or password as one of the words in the index
FTK presents 3 panes or panels by default Users can configure the placement if desired FTK provides a list of summary buttons with counts Clicking on these can bring up those items in a detail pane so that you focus on them Bad extensions Image files Deleted files Documents Unknown types Folders Bookmarked items etc
Tabs on the main window Overview Explore Graphics Search Bookmark
Shows general information about the case Selection in one pane shows details in another pane or sub-window
The bad extensions shows 7 files in the bottom pane Selecting one of the files in the bottom pane shows the contents in the 3 rd pane (upper right)
File list contains information about files X icon indicates deleted file File extension might indicate one type of file In reality, another type of file
Shows a Windows Explorer style of presentation 3 evidence items seen Each has sub-items Collapsible or expandable levels Click on Plus or Minus signs to expand/collapse views Selected item is shown in 3 rd pane List of items in the selected item are shown in bottom (2 nd ) pane Clicking on one of these will present that item in the 3 rd (top-right) pane
Icons at top of 3 rd pane Alter the presentation of data View as native application Text view Hexadecimal view Its the same data, just a different way of viewing it!
The following demonstrates what a user sees if selecting a single file in Explorer Tab
Selecting Giants Tickets.doc in Explorer Tab Word document Really made up of different components Selecting the file shows an item list of components in the file File slack is one of them
Shows a pane with thumbnails of images in the currently selected item in your case
On the main menu Select File Close Closes the case, remains in FTK Save Allows you to continue working on the case Exit Allows you to save (and backup.. Optional) the case Shuts down FTK
What is Slack Space? Its disk space which belongs to a file, but is not considered part of the files data Happens because of the way the system allocates disk space to files How does the system give disk space to a file? By clusters… a collection of 1 or more disk sectors A sector is 512 bytes (depends on the system) A cluster can be 1, 2, 4, or 8 sectors Files are written in these clusters, and dont normally fill up an entire sector or cluster Two types of Slack Space Ram slack Disk space after the file data and before the end of that sector File slack Disk space in sectors not used by the file, but belonging to the file
Whats the significance of slack space? Contents of RAM slack is generally whatever was in memory when the file was saved last Might be a password, credit card number, etc.. Or garbage File slacks contents can simply be whatever was left over and not erased when no longer needed by some other file Maybe even another user created that other file Slack can be used to hide information Its not visible to users It wont be grabbed by system and overwritten
In Overview Tab Select Slack/Free Space button Details pane contains all slack/free space items Full Path describes where that slack space is located In a specific file Its part of the file, but not part of the data itself Comes after the end of file marker Do a search Word might appear in slack, which might indicate an attempt at hiding something
Start from the Explore Tab Locate the file (Giants Tickets.doc) This file is deleted Highlight the file in Explore Youll see: Pane 2 (Lower pane): list of embedded stuff in the file, INCLUDING FileSlack Pane 3 (Upper right): The document as presented by FTK believing it to be a Word doc Then… in pane 2, select File Slack and observe whats displayed in pane 3
Conduct a search Examine the returned hits of the search Search results (hits) indicate where the occurrence was Even if in slack space Each hit also shows the data immediately before and after the hit phrase
Click the SEARCH tab As you type a word or character string Indexed words in case show up Once youve found or typed your search term ADD it to the search Youll see # of hits Youll see # of files containing those hits
Select the hits for the search item Then View Item Results You can use AND or OR logic when looking for multiple search items in the same file AND requires all to be present OR requires any one of them to be present
Indexed vs. Live Indexed Looks up terms indexed by FTK as evidence was added Live Looks up a term which wasnt necessarily in the index built by FTK Options Text ASCII UNICODE CASE SENSITIVE REGULAR EXPRESSION Hexadecimal
Keep ASCII and Unicode selected Theyre both defaults Default is ignore case Wont care if upper or lower Will take time Searches the entire case Regular expressions (NOT IN CSI 2012) A pattern to match Zip code Telephone number Social security number Credit card number Hexadecimal Look for non-printable character values
How do you find a deleted file? Overview Tab Select the summary button for Deleted Files All those files appear in the lower pane In the Explorer Tab You can view the directory structure in the 1 st pane Deleted files appear with a red X on the icon of the file or folder Deleted files are often recoverable You need to EXPORT the file
Why could this be significant? Investigator might recover information the suspect was attempting to hide or destroy might demonstrate intent to evade detection It can be demonstrated that a large number of files were deleted Just prior to execution of a search warrant After being interviewed by the police After receiving a call from a victim or conspirator When taken into account, might provide circumstantial evidence of intent
How you do it? Overview Tab Find the Summary Button for Bad Extensions Pane 2 lists all those files Explorer Tab Navigate to the location Pane 2 shows files in that location, with additional information for each file
What is exporting? Exporting allows an investigator to Select a file or files Save them as discrete files to another location outside of the FTK Case file Why? Allows investigators to process the exported file natively using applications such as Word, Excel, Paint, etc Some files must be processed natively (for example a Stegod file must be exported and handled using S-Tools as explained in section 5) Can burn to a DVD and give to DA or other investigator Allows investigator to consolidate items of interest in one place and present only those items
How do you export a file? Select the file (highlight it) in Explorer Tab Right-click on the file, and Export it
How do we find the file? Overview Tab Click on the Improper Name summary button Explorer Tab In pane 2 (lower pane), improper file extensions will be noted
What it means It might be a deliberate attempt to evade detection and hide information Information might be important It could also just be a mistake on the part of the user File saved or renamed with the wrong extension
How do I process a file with an Improper File Extension? Note the type of file it really should be Export the file Use the appropriate software to view the file, according to the real type of file it is
How you do it? Certain files, such as Windows BMP files, can be containers Software such as S-Tools can hide information inside these container files a.Locate a suspected stegod file (the container file) a.Should be a BMP file b.Export it from FTKs Case i.This saves it as a separate file you can then process outside of FTK c.Use S-Tools to extract the message file from the container file i.Password or a passphrase might be required!
Open S-Tools Drag the exported file believed to be a container file into S-Tools
Right-click the container in S-Tools Select Reveal When prompted, provide the passphrase Can be a single word or a phrase Could be case sensitive A revealed archive window shows with the hidden file name and size Select the file in the Reveal Archive box Right-click the file you wish to extract from the container file Save as… Choose a location Youve now successfully extracted the hidden message!
What it means Definitely a means of evading detection. Its not accidental!! 1. Data is hidden 2. passphrase might be required Whoever can be demonstrated to know the passphrase either put the hidden data there, or knew how to retrieve it Guilty knowledge!
Best of luck to all CSI Challenge participants!