Incoming connections on port 445 (tcp)

[tommy456 12]

I the EIS network protection troubleshooting menu Eset has been blocking incoming connection requests from unknown IP's  on port 445 (TCP) Is this background chatter from bots, probes ect, or could it be a sign of something more sinister?

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[itman 1,659]

First up is the Microsoft Publication Service Device Host that is connecting to a Russian IP address per Robtex lookup: Quote 5.145.203.195 whois Smoltelecom PPPoE (dynamik IPs pool2) route 5.145.192.0/18 bgp AS44265 asname SMOLTELECOM-NET descr Dummy description for 5.145.192.0/18AS44265 location Smolensk, Russia   Per Microsoft: Quote Publication Services enables a WSD device to advertise (publish) its functionality and then offer its functions as Web services over IP-based networks. It also enables devices to find (discover) and access Web services of other devices and computers on the same network. From a user's perspective, NCD technologies will largely eliminate the experiential difference between using devices directly connected to a computer and those virtually connected over a network (including the Internet). As explained above, typically a developer will uniformly access NCDs using higher-level publication services and function discovery. https://msdn.microsoft.com/en-us/library/bb756908.aspx/ Why that process is running let alone installed on an end user PC is beyond me.

[itman 1,659]

As far as the inbound port 445 traffic, your router should be blocking any unsolicited inbound traffic on that port. That means something on your PC is most likely sending outbound TCP traffic on port 445. This is a no-no in my security book but the Eset firewall by default rule will allow it. The culprit my best guess is the above noted process.

Edited December 20, 2018 by itman

[tommy456 12]

Well since my last, there has been at least 1 attempt to connect via Port 1900  this has only been happening in the past few days

[itman 1,659]

17 minutes ago, tommy456 said:

Well since my last, there has been at least 1 attempt to connect via Port 1900 

SSDP Eset firewall blocks are the norm. I just disabled the service in Windows since I was tired of my associated Win Event log filling up with blocked entries. 

[novice 20]

1 hour ago, itman said:

This is a no-no in my security book but the Eset firewall by default rule will allow it.

So, what the point in running ESET firewall in default mode if something which is no-no in your security book is allowed out????

[itman 1,659]

40 minutes ago, novice said:

So, what the point in running ESET firewall in default mode if something which is no-no in your security book is allowed out????

If a worm is able to install itself, the first thing it will try to do is connect outbound TCP port 445.

Eset by default doesn't block outbound TCP port 445 since if your on a internal network and share files or printers, it is valid communication. I am not on a network and as such, don't share files or printers.

[novice 20]

9 hours ago, itman said:

If a worm is able to install itself, the first thing it will try to do is connect outbound TCP port 445.

Eset by default doesn't block outbound TCP port 445 since if your on a internal network and share files or printers, it is valid communication. I am not on a network and as such, don't share files or printers.

The worm should be something like "worm".exe, so the firewall should let me know when an ".exe" is trying to access the internet, not to wide open tcp445.

For example TCP80 and TCP443 are used for IE ; this doesn't mean a firewall should be open BY DEFAULT   on ports 80 and 443 .

Otherwise, in default configuration there is no difference between Win Firewall (built in ) and ESET firewall.

Edited December 21, 2018 by novice

[tommy456 12]

SSDP Disabled  which also disabled UPnP, (win 7) but that has stopped these inbound attacks or whatever they were, All those IP addresses  did appear in  Wireshark, but i didn't save the Pcap, i have since installed a Microsoft tool that works like Wireshark, but shows the process that is sending /receiving , Eset scans find nothing within the O/S  or 3rd party S/W installed on the PC , So if it's a worm Eset isn't detecting it

[itman 1,659]

2 hours ago, tommy456 said:

SSDP Disabled  which also disabled UPnP, (win 7) but that has stopped these inbound attacks or whatever they were

Are you stating that this stopped the inbound port 445 blocked connections you originally posted?

[tommy456 12]

I ain't 100% sure it was solely down to disabling  that service, or them both,  the only problem that is apparent is that streaming to my smart tv is no longer working as a result,

I did prior to this close port via CMD, I will re-enable both services at some point and try and find which process or processes are generating the traffic  to those IP's  i recently found out that the s/ware i use to control the cooling fans and RGB on my GPU 

https://www.bleepingcomputer.com/news/security/asus-gigabyte-drivers-contain-code-execution-vulnerabilities-pocs-galore/

So could be this S/w or it may be something else,