Threat Level: green Handler on Duty: Jan Kopriva

SANS ISC: What is happening on 2323/TCP? - SANS Internet Storm Center SANS ISC InfoSec Forums

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What is happening on 2323/TCP?

A number of sources, including DShield, have noticed an uptick on port 2323 TCP beginning around 3 weeks ago.

This is the scanner portion of the Mirai botnet scanning for IoT devices on both 23/TCP and 2323/TCP.   There are a number of IoT devices that use port 2323/TCP as an alternate port for Telnet.  Those who have setup listeners on port 2323 are seeing brute force credential attacks utilizing a small dictionary.

The Mirai botnet iwas used to attempt to DDOS Brian Krebs website i and ifor the nearly 1 Tbps DDOS against OVH in late September


-- Rick Wanner MSISE - rwanner at isc dot sans dot edu - - Twitter:namedeplume (Protected)


324 Posts
ISC Handler
Oct 7th 2016
I was just wondering about this very thing a couple of hours ago when I was looking through my firewall logs.

1 Posts
Yes, I have been seeing a lot of this in some various logs as well. Thanks for your post.
1 Posts

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