Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: Teredo request for packets - SANS Internet Storm Center SANS ISC InfoSec Forums

Watch ISC TV. Great for NOCs, SOCs and Living Rooms:

Sign Up for Free!   Forgot Password?
Log In or Sign Up for Free!
Teredo request for packets

We got an e-mail today from Rick about some really odd UDP traffic he was seeing.  We took a look and it looked like Teredo keep-alive traffic (IPv6 tunnels), but Rick wasn't running Teredo.  It got some of the handlers wondering, so we're going to ask for packets from those of you who are NOT running Teredo (we don't really want to see your traffic, we're looking for anymore of these weird, apparently misdirected, packets).  So, for those that are willing, could you run the following tcpdump command and upload the results to the contact page?  We'll post our analysis in a week or two, if we can figure anything out.  Thanx in advance.

tcpdump -c100 -s0 -i any -w /tmp/teredo udp port 3544

Jim Clausing, jclausing --at-- isc [dot] sans (dot) org
SEC 503 coming to central OH beginning 22 Feb, see here

I will be teaching next: Reverse-Engineering Malware: Malware Analysis Tools and Techniques - SANS DFIR Summit & Training 2022


423 Posts
ISC Handler
Feb 16th 2010
Looks like most of my UDP/3544 traffic is destined for Microsoft owned Ip addresses

Sign Up for Free or Log In to start participating in the conversation!