What's up with port 8881? - SANS Internet Storm Center

What's up with port 8881?
As I've noted in the past, one of the tools that I really like here and that is available to the public is our port detail. So, as the result of a conversation at the day job the other day, I decided to take a look at the last 11 months of traffic on port 8881. Below is the graph. Does anyone know what happened in September that led to huge increase in traffic? If you look at the ASCII table, you can see the number of destinations stayed in the range of roughly 5-15, but the number of sources has gone up tremendously. Also, the mix of TCP to UDP dropped to roughly 75-85% (which may actually point to an answer, but I'll save my conjecture for an update). So, if anyone has a packet capture they'd like to share, please upload through the contact page. --------------- Jim Clausing, GIAC GSE #26 jclausing --at-- isc [dot] sans (dot) org I will be teaching next: Reverse-Engineering Malware: Malware Analysis Tools and Techniques - SANS DFIR Summit & Training 2022	Jim 423 Posts ISC Handler Jan 15th 2011
Thread locked Subscribe	Jan 15th 2011 1 decade ago
I don't have a capture... but I recall hearing something about this port and it's connection with Bitdefender 2011 months back... something about p2p update or something. BD 2011 was released around September...	Anonymous
Quote	Jan 15th 2011 1 decade ago
See the conversation at: http://forum.bitdefender.com/index.php?showtopic=21924	Anonymous
Quote	Jan 17th 2011 1 decade ago
SpeedGuide has other information on port 8881 - hxxp://www.speedguide.net/port.php?port=8881	HackDefendr 65 Posts
Quote	Jan 18th 2011 1 decade ago