Difference between pages "Vincent Liu" and "Timestomp"

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[[Category:People]]
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[[Image:timestomp_mace.jpg|thumb|100px|right|Timestomp MACE Values]] Timestomp is a utility co-authored by developers [[James C. Foster]] and [[Vincent Liu]].  The software's goal is to allow for the deletion or modification of time stamp-related information on files.  Take for example the following screenshot of a command prompt window displaying the MACE values for a document file titled "text.txt".  There are (4) four date time and date stamps displayed that are useful to Forensic Examiners in reconstructing when data was last modified, accessed, created, or entered into the NTFS Master File Table by the Operating system or manually by the user.
  
Vincent Liu is the co-author of the [[anti-forensic]] utility known as [[Timestomp]].
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[[Image:timestomp_mace_change.jpg|thumb|100px|right|Timestomp MACE Change]] Using the Timestomp application, I have completely changed the modified date and time stamp (i.e., evidenced by the second screenshot).  If I were to change it, along with the other entries to more believable dates and times, then the validity of the document falls into question as does its ability to completely slip by an examiner's watchful eye if looking for modified files in an entirely different year or date span.
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[[Image:timestomp_mace_change_proof.jpg|thumb|100px|right|Timestomp MACE Change Proof]] Here is a final screenshot of the Operating System's interpretation of the Modified time stamp.  It reflects the change exactly.
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Note: Although this program is designed to frustrate forensic analysis, it should be noted that its use can be easily detected. Because the program can delete all time stamp information, the lack of time stamp values would lead an examiner to the conclusion that something is amiss on the system.  Microsoft-based Windows operating system record at least some timestamp information. The total absence of such is a dead giveaway that a user has tried to hide something. On the flipside, if the values are simply changed to believable values, then there is little chance of the change(s) being noticed at a casual glace.
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== External Links ==
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* [http://www.metasploit.com/projects/antiforensics/timestomp.exe Download Timestomp.exe]
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* [http://www.blackhat.com/presentations/bh-usa-05/bh-us-05-foster-liu-update.pdf Presentation at Blackhat 2005]
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[[Category:Anti-forensics tools]]

Revision as of 11:35, 25 October 2007

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Timestomp MACE Values
Timestomp is a utility co-authored by developers James C. Foster and Vincent Liu. The software's goal is to allow for the deletion or modification of time stamp-related information on files. Take for example the following screenshot of a command prompt window displaying the MACE values for a document file titled "text.txt". There are (4) four date time and date stamps displayed that are useful to Forensic Examiners in reconstructing when data was last modified, accessed, created, or entered into the NTFS Master File Table by the Operating system or manually by the user.


Timestomp MACE Change
Using the Timestomp application, I have completely changed the modified date and time stamp (i.e., evidenced by the second screenshot). If I were to change it, along with the other entries to more believable dates and times, then the validity of the document falls into question as does its ability to completely slip by an examiner's watchful eye if looking for modified files in an entirely different year or date span.


Timestomp MACE Change Proof
Here is a final screenshot of the Operating System's interpretation of the Modified time stamp. It reflects the change exactly.


Note: Although this program is designed to frustrate forensic analysis, it should be noted that its use can be easily detected. Because the program can delete all time stamp information, the lack of time stamp values would lead an examiner to the conclusion that something is amiss on the system. Microsoft-based Windows operating system record at least some timestamp information. The total absence of such is a dead giveaway that a user has tried to hide something. On the flipside, if the values are simply changed to believable values, then there is little chance of the change(s) being noticed at a casual glace.

External Links