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Special Forums Cybersecurity UNIX files timestamping - Need experts opinion as testimonial Post 302896132 by docflied on Friday 4th of April 2014 01:51:47 PM
Old 04-04-2014
UNIX files timestamping - Need experts opinion as testimonial

Hi
I am requesting your help to obtain opinions and testimonials in order to be be able to make my own opinion since I am definetly not a unix expert.

Say we have a UNIX server.
On this server there is a specific directory let us call it "DIR"
A security incident have been reported related to this server.
Expert in forensics analyzed it and wrote this (modified a bit for confidentiality reasons)

Files : File1 to File14
"The above files were known to have been present in the directory. File system timestamps indicate that they were last accessed arround HH:MM on D Month Year and deleted around HH:MM on D Month Year. Investigators have attempted carving these files from free space on the system to determine their contents, however the files were unrecoverable. Some of there files may have been present for legitimate purposes."

Files : File15 to File20
"Due to the files' metadata having been overwritten, the initial date of their presence and their deletion date are unknown."

Since all files (File1 to File20) are supposed to have been present in the same directory (DIR) is it possible to succeed in identifying access and deletion timestamp of only a subset? Also File1 to File14 are assumed to be created and deleted earliest than File15 to File20 (fwe month to several years for some files)

Please give me your opinion only if you master unix file system and how files timestamps are managed.
The many the best.

Any way thank you very much for your time and help.
 

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talkd(8c)																 talkd(8c)

Name
       talkd - inter-terminal communications server

Syntax
       /etc/talkd

Description
       The  program  is  the  server  for the program.	The server provides a rendezvous method for the requesting (possibly remote) and the local
       responding

       The server is invoked by when it receives a packet on the port indicated in the talk service specification.

Restrictions
       The server does not strictly follow network byte order in its packet format and may have difficulty in talking with implementations  of	on
       other architectures that do not take this into account.

       The  version  of  released  with ULTRIX V3.0 uses a protocol that is incompatible with the protocol used in earlier versions. Starting with
       ULTRIX V3.0, the program communicates with other machines running ULTRIX, V3.0 (and later), and machines running 4.3  BSD  or  versions	of
       UNIX based on 4.3 BSD.

       The command is not 8-bit clean. Typing in DEC Multinational Characters (DECMCS) causes the characters to echo as a sequence of a carets (^)
       followed by the character represented with its high bit cleared. This limitation makes unusable if you want to communicate using a language
       which has DECMCS characters in its alphabet.

See Also
       talk(1), services(5), inetd(8c), ntalkd(8c)

																	 talkd(8c)
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