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Port 30005 is open, but why?

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#1 slimx7


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Posted 21 October 2016 - 06:43 AM

I did a scan for open ports using the services on speedguide.net and it showed the tcp port 30005 as open. Subsequent probing on canyouseeme.org and Shields Up also showed the port as being open.
My questions are: What is this port used for, why is it open and how can I close it or at least set it to stealth? Should I be worried? Any research I've done on the port has given me vague information. It has been linked to a trojan called Backdoor JZ and other sources say that it has to do with TR-069 on routers.
I'm not running any services so I don't have a clue why the port is open. I only know that open ports are generally a bad thing so any information I could possibly get on the matter is greatly appreciated.

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#2 Didier Stevens

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Posted 22 October 2016 - 07:22 AM

What is your network setup? It's likely that the port is open on your modem/router, and maybe not on your computer.

Didier Stevens

SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019


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