this post was submitted on 03 Oct 2024

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334

I found a weird IP address on my network that had transmitted an insanely small amount of data. I put the address in my browser and got this. what the heck am I looking at? (lemmy.world)

submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]

102 comments fedilink hide all child comments

UPDATE 10/4 6:47 EDT

I have been going through all the comments. THANKS!!!!!! I did not know about the techniques listed, so they are extremely helpful. Sorry for the slow update. As I mentioned below, I got behind with this yesterday so work cut into my evening.

I ran a port scan. The first syntax, -p, brought no joy. The nmap software itself suggested changing to -Pn. That brought an interesting response:

nmap -Pn 1-9999

Starting Nmap 7.93 ( https://nmap.org ) at 2024-10-04 11:44 BST

Failed to resolve "1-9999". Nmap scan report for Host is up (0.070s latency). All 1000 scanned ports on 192.168.0.46 are in ignored states. Not shown: 990 filtered tcp ports (no-response), 10 filtered tcp ports (host-unreach) Nmap done: 1 IP address (1 host up) scanned in 6.03 seconds Just to be absolutely sure, I turned off my work computer (the only windows box on my network) and reran the same syntax with the same results.

As I read this, there is definitely something on my network running windows that is not showing up on the DHCP.

UPDATE 10/6

I am working through all these suggestions. I am sorry for the slow responses, but I have my hands full with family weekend. I will post more next tomorrow. But I did do one thing that has me scratching my head and wondering if this may be a wild goose chase.

I ran the nmap again per below with a completely fictional IP address within my normal range. It gave the exact same results:

nmap -A -T4 -p- -Pn

Starting Nmap 7.93 ( https://nmap.org ) at 2024-10-05 13:36 BST Nmap scan report for

Host is up (0.054s latency).

All 65535 scanned ports on are in ignored states.

Not shown: 65525 filtered tcp ports (no-response), 10 filtered tcp ports (host-unreach)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .

Nmap done: 1 IP address (1 host up) scanned in 182.18 seconds

(page 2) 50 comments

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[–] [email protected] 26 points 2 months ago (1 children)

Windows IIS probably from around the time of windows 8 so maybe 2012. Probably running on either windows server 2012 (like exchange, an active directory domain controller, or if you are unlucky sharepoint) or some weirdly configured appliance running windows 8 ish enterprise.

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[–] [email protected] 15 points 2 months ago (5 children)

Get the MAC address from the ARP table, and look up the OIN, should help you determine if it's virtual or physical, and if physical the type of NIC it's using.

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[–] [email protected] 41 points 2 months ago (1 children)

Bro, you gotta keep us updated, I'm surprisingly invested in this now.

[–] [email protected] 22 points 2 months ago

I lost my entire morning to this yesterday. I had to work late to catch up. There are some good ideas in here I’m starting on now.

[–] [email protected] 21 points 2 months ago (4 children)

Others haven't suggested this yet, but a single device, like your laptop, even with one connection, can have two IPs.

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[–] [email protected] 14 points 2 months ago (4 children)

nmap -A -T4 -p- <IP>

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[–] [email protected] 16 points 2 months ago (1 children)

There was an appliance where the wifi chip was at the end of the power cable, embedded inside the plug. From the outside, you couldn't really tell. It was there so radiation inside the box couldn't affect the wireless signal as much.

I can imagine some genius thinking it's a good idea to run a server from inside a cable or a connected home appliance.

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[–] [email protected] 8 points 2 months ago (1 children)

Windows 8 is starting to break out

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[–] [email protected] 63 points 2 months ago (1 children)

Following, I want to know what god awful iot device this is. Refrigerator? Toaster oven? Vibrating dildo? The suspense is killing me

[–] [email protected] 35 points 2 months ago (2 children)

Nobody wants windows on a vibrating dildo

[–] [email protected] 16 points 2 months ago (3 children)

Maybe I want my vibrating dildo to take an hour to load and come with spyware

[–] [email protected] 7 points 2 months ago (1 children)

Hey, I'm not normally one to judge but it seems like a bad idea to call yourself spyware. Either you're going to blow your cover or it's just negative self talk.

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[–] [email protected] 27 points 2 months ago

I mean, Windows already fucks us metaphorically

[–] [email protected] 20 points 2 months ago

This is where you find that shit is so bloated and pointlessly connected that it's running on a washing machine.

[–] [email protected] 74 points 2 months ago* (last edited 2 months ago) (3 children)

So, as others have saId this is just an unconfigured IIS server, which implies it's either a windows machine, or a windows based VM, well or someone put the default IIS files on another server, but that's unlikely.

When you say "weird" IP I'd wonder what you mean by that.

I think since it's probably a windows machine, from another windows machine typing nbtstat -A <ip> should give you the computer name and workgroup or domain they belong to. See if it matches anything you expect on your network.

If not, maybe it's time to change your WPA wifi key.

[–] [email protected] 4 points 2 months ago* (last edited 2 months ago) (1 children)

Thanks. I ran nbtstat and it came up empty.

Edit: Also, I am big on wired networks. I mostly save WI-FI for smart and mobile devices. There is a lot of stuff on Ethernet that does not need a password.

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[–] [email protected] 6 points 2 months ago (1 children)

At least get WPA2

[–] [email protected] 4 points 2 months ago

I don't even think my current wifi kit has WPA (1) as an option. It's WPA2 or 3 only I'm pretty sure.

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[–] [email protected] 15 points 2 months ago (1 children)

Depending on your router, it could have a docker setup with Windows on it. I've seen some strange shit on cheap routers with far too much processing power and storage.

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[–] [email protected] 35 points 2 months ago* (last edited 2 months ago) (4 children)

If you can, power stuff off and check if that web page is still available. Start with any Windows machines. It could be a virtual machine running inside of something else though.

Edit: here's how to disable that web server https://superuser.com/a/1377078 . I'd do that on any Windows machines as well.

[–] [email protected] 7 points 2 months ago

The mac address can also tell you the hardware vendor.

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[–] [email protected] 7 points 2 months ago

Is your IP adres same as localhost and you are using Windows Pro, then probably IIS is installed on your device.

[–] [email protected] 30 points 2 months ago (2 children)

does your router give you the MAC address of the device? You can look it up to see who manufactured it and then narrow down. This could be a device that has a web service running is all you are seeing right now.

[–] [email protected] 3 points 2 months ago (4 children)

It does not show up on the DHCP table, nor does it reflect pings.

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[–] [email protected] 19 points 2 months ago

Don't need the router. If you're on windows or linux, you just ping the ip then enter 'arp -a <ip>' it will show the MAC address for the IP from your machine's arp cache.

[–] [email protected] 17 points 2 months ago (1 children)

How insanely small was the transfer? Like 1 bit?

[–] [email protected] 7 points 2 months ago

9 packets

[–] [email protected] 84 points 2 months ago (3 children)

As everyone else has said this is the out of the box default page that comes with Microsoft IIS web server on windows server.

Though I feel like you'd know if you had a copy of windows server running on your network somewhere—is the IP in your usual network subnet?

[–] [email protected] 19 points 2 months ago (1 children)

You can enable IIS on almost any windows flavor.

https://helpdeskgeek.com/windows-10/install-and-setup-a-website-in-iis-on-windows-10/

[–] [email protected] 3 points 2 months ago

Fair point.

As a note, I don't recall all of them saying 'Windows Server' in the top left of that page.

[–] [email protected] 29 points 2 months ago (6 children)

The only windows box on my network is my company laptop. It is on a different IP address than that one.

It IS in my normal range, but it is NOT listed on my Router’s DHCP client list.

[–] [email protected] 49 points 2 months ago (1 children)

Have you recently installed visual studio or are doing any .NET development? It could possibly be a containerised version of IIS

If you completely turn off your windows device and try to access the IP from another device does it still resolve?

[–] [email protected] 32 points 2 months ago (1 children)

Great Idea! My windows box is off and I can still see it from my phone.

[–] [email protected] 36 points 2 months ago* (last edited 2 months ago) (2 children)

Hmm

I'd maybe try systematically turning any other devices off you think could potentially have the grunt to run windows server in a container or VM.

Do you have a Mac/Linux machine handy? If you run arp -a in one terminal and ping the unusual IP in another, that should give you a corresponding MAC address for the device. You can then look up the MAC address and see if it gives you any more info about the device running it—it might not but you never know. You can use something like https://dnschecker.org/mac-lookup.php

I guess next you could look at taking that MAC and blocking it in your router control panel and see if anything starts complaining

[–] [email protected] 22 points 2 months ago* (last edited 2 months ago)

I guess next you could look at taking that MAC and blocking it in your router control panel and see if anything starts complaining

I love the "see who screams" method, my coworkers do not. it's usually instant.

[–] [email protected] 19 points 2 months ago (1 children)

In addition, you might like to do a portscan on that IP address to see if any other ports reaveal something more interesting.

You can run this in cmd prompt, I think, if nmap is available on your windows machine:

nmap -p 1-9999 192.168.1.1

IIS can only run on a windows OS, so it must be a windows physical machine or VM connected to your network.

[–] [email protected] 5 points 2 months ago (1 children)

Thanks as you can tell, I’m not an expert in any of this.

I will run this as you described.

I did the nmap based on input from ChatGPT, it had me do a Ping base scan with nmap. It turned up nothing because that IP address did not return a Ping.

This has me really curious.

I’m concerned that the website I opened in Safari on my phone is bringing up a cache on my browser and is not actually live.

I tried to open it from an iPad and it did not load. Iit still loads off my phone even though I have rebooted everything.

[–] [email protected] 4 points 2 months ago (1 children)

In case it helps your troubleshooting, ICMP (ping) is typically disabled by default on Windows.

[–] [email protected] 2 points 2 months ago (1 children)

Thanks. It is not responding to ping.

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[–] [email protected] 3 points 2 months ago (2 children)

Yeah, that's a company server, specifically for the local network group

It IS in my normal range, but it is NOT listed on my Router’s DHCP client list.

Why would an internal server change IP all the time? DHCP is for silly things like laptops that turn on and off eleventy times a day

[–] [email protected] 8 points 2 months ago* (last edited 2 months ago)

Even if it isn't changing IP, you still want it in your DHCP table so that IP doesn't accidentally get assigned to something else. It's unlikely on a small network but it can happen.

[–] [email protected] 5 points 2 months ago (2 children)

Thanks! I did not know DHCP allocation was optional on a home network.

[–] [email protected] 3 points 2 months ago (2 children)

"home" isn't descriptive enough. you can run some VERY powerful, in depth stuff if you were so inclined on a "home" network.