Threat Level: green Handler on Duty: Rob VandenBrink

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Tools for extracting files from pcaps

Published: 2009-08-13
Last Updated: 2009-08-16 00:42:14 UTC
by Jim Clausing (Version: 2)
8 comment(s)

Often in the course of investigating a compromised machine or when analyzing malware in a sandnet or honeynet, I will have a complete capture of all the network activity in a pcap file and I want to pull out any files that were downloaded by the infected machine.  Unfortunately, I have not found any really good tools that allow me to full files from lots of different types of traffic.  A couple of years ago, I put together a perl script that used tcptrace and the HTTP::Response perl module to pull downloaded files out of HTTP traffic, but what about other forms of traffic?  FTP?  SMTP?  unknown TCP or UDP?  whatever?  My ideal tool would be able to reassemble the packets, discard headers, etc.  Well, the other day I noticed a post on Darknet about Xplico that might be (at least the basis of) the magic tool I'm looking for.  I'm just starting to play with it, but I figured this might be a good time to ask our readers what they use?  You can send us e-mail, use the contact form, or leave a comment.  Thanx in advance.

Update: 2009-08-16 00:15 GMT (jac)  A huge thanx to all who wrote in, here are some of the tools you suggested.

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Jim Clausing, jclausing --at-- isc dot sans dot org

8 comment(s)

New and updated cheat sheets

Published: 2009-08-13
Last Updated: 2009-08-13 03:46:13 UTC
by Jim Clausing (Version: 1)
0 comment(s)

A couple of things I noticed on twitter today and thought you might be interested.  Our friend, Jeremy Stretch, at packetlife.net is in the process of updating some of his excellent networking cheat sheets (I mentioned his 802.1x one here).   Check them out at http://packetlife.net/cheatsheets/ and look for the ones at version 2.0 or greater (if your favorite hasn't been updated yet, check back in a few days, he isn't done yet).  Also, SANS instructor, Rob Lee points us to a couple of new cheat sheets for doing forensics on USB keys under XP or Vista/Win7.

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Jim Clausing, jclausing --at-- isc dot sans dot org

0 comment(s)

CA eTrust update crashes systems

Published: 2009-08-13
Last Updated: 2009-08-13 01:35:11 UTC
by Johannes Ullrich (Version: 1)
1 comment(s)

 

   It appears that the latest update to Computer Associates "eTrust" anti-virus tool marks a number of Windows system files, including files that are part of eTrust itself, as malware rendering the system inoperable. Please use care in applying the update. It was released on Wednesday, Serial # 33.3.7051 . If you already have it installed and are experiencing problems: Doesn't look like there is a simple solution. If you have it installed but things are fine so far: Maybe consider turning off "on access scanning" until the next update is released (which probably has already happened)

References:

http://www.dynamoo.com/blog/2009/08/ca-etrust-goes-nuts-with-stdwin32-and.html

 

 

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Johannes B. Ullrich, Ph.D.
SANS Technology Institute
Twitter

Keywords: antivirus ca
1 comment(s)
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