Done poorly, the $FN creation timestamp and $SI creation timestamp won’t match. The simplest example of a timestamp attack is to change the file-creation date to a time prior to incursion. Finally, directory entries in the MFT have an index attribute that stores a copy of the $FN attribute (including timestamps) for all files in that directory. The timestamps in the $FN attribute roughly correlate to interactions with the location and name of the file. The timestamps in the $SI attribute roughly correlate to interactions with the contents of the file. Standard files also have a $FILE_NAME ($FN) attribute that contains its own set of timestamps. One attribute – $STANDARD_INFORMATION ($SI) – stores a collection of timestamps. Every entry in the MFT contains a number of attributes that store metadata describing the file. The core element of NTFS is the Master File Table (MFT), which stores an entry for every single file on the system. To explain, we’ll have to explore some of NTFS’s structure. When it comes to covering up evidence in timestamps, NTFS is a little more complicated than other filesystems.
“ Timestomping” is the common name for the anti-forensics tactic of destroying filesystem timestamp evidence of the attacker’s file modifications. They’re a common focus for both the attacker and the forensic analyst. File timestamps, if left unmodified, provide a great deal of information about the attacker’s timeline and behavior. Attackers who want to remain undetected for as long as possible need to clean up these traces. Identifying “Timestomping” AttacksĮvery interaction with a filesystem leaves a trace. Today, we’ll demonstrate some familiar real-world use-cases for forensic analysts interested in leveraging osquery in their incident response efforts. Previously, we announced and briefly introduced the features of the new NTFS forensics extension that we added to our osquery-extensions repository. We continued our collaboration with Crypsis, a security consulting company, to show some immediate scenarios where osquery comes in handy for forensic analysts. While osquery core is great for querying various system-level data remotely, forensics extensions will give it the ability to inspect to deeper-level data structures and metadata not even available to a user at a local system. Now another audience is discovering osquery: forensic analysts. Security threat hunters use it to find indicators of compromise on their systems. System administrators use osquery for endpoint telemetry and daily monitoring.
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