Re: Computer forensics to uncover illegal internet use

["Frankie Li" <securityf () cheesy ca>]

If I were you, I shall try to image the harddisk of the subject machine 
using dd and then try to rebuild the timeline, checking in between the 
suspect dates for any deleted images or files by using tools such as 
sleuthkit + autopsy

For the network level, I shall check if I could found something in the 
firewall logs


FL


----- Original Message ----- 
From: "Edmond Chow" <echow () gettechnologies com>
To: <security-basics () securityfocus com>
Cc: "Edmond Chow" <echow () videotron ca>
Sent: Saturday, August 27, 2005 7:23 AM
Subject: RE: Computer forensics to uncover illegal internet use


> Dear List,
>
> I'm working on the following project and would appreciate your views:
>
> I have been tasked with finding out if a certain desktop computer was used
> to view pornographic sites on the internet.  This user has gone to great
> lengths to try to mask his illegal activities by erasing cookies, temp.
> files and by installing anti-spyware software on his computer.  Are there
> any tools that would allow me to still uncover proof that he had accessed
> these sites?  So far, the tech department is telling me that he did access
> illegal sites on only two dates but I suspect that this illegal activity
> started many months or years ago and it will be up to me to find more 
> proof.
>
> Also, at a network level, we know his IP address but yet my technical
> support department is telling me that they cannot (either because they 
> don't
> want to or because they are not technically capable of) tell me what
> internet sites this IP address has accessed in the past.  Logically, there
> must be a point in the network (on some piece of hardware) where I can
> consult log files to track his activities?  Or, is there a log file that I
> can consult that will tell me what sites all my users have accessed and 
> from
> what IP address?
>
> In terms of access to the desktop in question, I will have full access as
> the computer will be in my possession in the coming days.
>
> Thank-you and any help that you can provide would be most appreciated.
>
> Regards,
>
>
> Edmond