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submitted 2 days ago* (last edited 1 day ago) by RestrictedAccount@lemmy.world to c/nostupidquestions@lemmy.world

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.

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[-] OfficerBribe@lemm.ee 1 points 1 hour ago* (last edited 1 hour ago)

Besides the MAC lookup suggestion, have you tried to simply find hostname in local DNS by reverse IP lookup, maybe that would shed some light.

Not sure if there is anything useful, but in browser just check site source, maybe there is something useful there that could help with identification. Does site have certificate? It might include info that would help with identification. Do the standard browser network trace via dev tools F12, maybe something useful appears there.

In nmap you can attempt to guess OS, try that. Additionally it might be possible to get hostname as well.

And have you checked your router to see if this connection is connected to your Wi-Fi AP or Ethernet to narrow things down? If it is not possible to determine this from router, simply connect your main PC to Ethernet, disable AP in router settings and check if IIS site is still up. If it is not, enable AP again, does it come back early or it takes some time?

Lastly, if it still is a mystery, start powering off devices one by one to find the source. Based on comments it seems you have multiple devices, but I assume it would not take that long?

[-] Crashumbc@lemmy.world 8 points 13 hours ago* (last edited 13 hours ago)

You don't have Ethernet over power do you?

Fun story, I live in a townhome, I had so bizarre network issues going on. Not able to stream to TV etc. finally started unplugging shit. Unplugged the router and saw the computer still happily downloading something WTF! Turns out a neighbor also had Ethernet over power and devices were randomly connecting to their network. Crazy ass shit.

[-] iguanajuice@lemmy.world 4 points 12 hours ago

I'm confused. Are you talking about power over ethernet or power-line ethernet?

[-] JordanZ@lemmy.world 9 points 12 hours ago

There are Ethernet extenders that can utilize the power lines. They basically plug into an outlet and you stick an Ethernet into them and do the same somewhere else in the house.

[-] Crashumbc@lemmy.world 3 points 11 hours ago

Exactly, except mine was talking to the neighbors :p

[-] mvirts@lemmy.world 2 points 12 hours ago* (last edited 12 hours ago)

Maybe set up Kismet https://www.kismetwireless.net/

That'll show devices attempting to break in wirelessly

[-] mvirts@lemmy.world 2 points 12 hours ago

... So when you port scanned it, IIS was gone?

[-] mvirts@lemmy.world 1 points 12 hours ago

Maybe try traceroutre or lft (layer 4 traceroutre) to see if something wacky is happening with routing in your lan?

[-] mvirts@lemmy.world 1 points 12 hours ago

You're looking at my worst nightmare 😅

I would download metasploit and dig up some interesting exploits to try against it.

[-] Flax_vert@feddit.uk 13 points 22 hours ago

It's me. I'm your nextdoor neighbour. Sorry!

[-] Agent641@lemmy.world 39 points 1 day ago

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

[-] RestrictedAccount@lemmy.world 20 points 1 day 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.

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.

[-] RestrictedAccount@lemmy.world 13 points 1 day ago

Thanks. This helps. My work computer is way newer than that. It makes me think it could be networking hardware. I have some kit that’s about that old.

[-] fmstrat@lemmy.nowsci.com 20 points 1 day ago

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

[-] RestrictedAccount@lemmy.world 7 points 1 day ago

Thanks. It is neither the Ethernet nor the Wi-Fi on my windows laptop.,

[-] caseyweederman@lemmy.ca 9 points 22 hours ago

Don't just turn your devices off when testing - - unplug them. An off computer can still respond to network requests.

[-] RestrictedAccount@lemmy.world 6 points 22 hours ago

I did not think of this. I will have to go into the bios to turn off the battery of my work laptop.

[-] caseyweederman@lemmy.ca 7 points 20 hours ago

There's Power Over Ethernet too.

[-] Seasm0ke@lemmy.world 61 points 1 day ago

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

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[-] SlothMama@lemmy.world 14 points 1 day ago

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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[-] ptz@dubvee.org 182 points 2 days ago

It's the default page for a Windows Server running IIS web server.

[-] fubarx@lemmy.ml 15 points 1 day ago

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.

[-] RestrictedAccount@lemmy.world 9 points 1 day ago

Sounds like purchasing got a deal on surplus spook gear.

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this post was submitted on 03 Oct 2024
325 points (98.5% liked)

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