Tools for extracting files from pcaps
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.
- NetworkMiner ( thanx, Russ and Dentrasi. Just found this note on running it under wine on Linux)
- tcpxtract (suggested by John R, Chris and Doug)
- Bro (suggested by Nicholas)
- tcpflow (suggested by Ratufa and Chris)
- foremost (suggested by Chris and Doug)
- the dsniff suite (suggested by Chris and Jason)
- Chaosreader (suggested by Chris and Parveen)
- pyflag (suggested by Chris)
- tcptrace (suggested by John T)
- tcpick (suggested by Doug)
- xtract.py from npeid (suggested by anonymous)
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Jim Clausing, jclausing --at-- isc dot sans dot org
New and updated cheat sheets
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
CA eTrust update crashes systems
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
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