Questions tagged [network-scanners]

Programs that map out a network to figure out which computers and services are available to be exploited.

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1answer
70 views

Intensive 586 (ms-shuttle) port scan/exploit/hacking attempts

Recently i wanted to play a bit with TCP/UDP networking (and touch some custom HTTP server impl) on C# and found out that i'm getting requests from totally unknown dudes, such as this one: FROM: [::...
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1answer
75 views

Service changing port when scanned with nmap [closed]

While scanning a host with nmap I have discovered an unusual service. The service moves to another port everytime I perform an nmap-scan or try to curl it. I have not yet found any info about similar ...
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0answers
32 views

Secure Implementation of Network Discovery Tool in Corporate Network [closed]

I would like to implement a network discovery tool, which automatically detects all devices in a network including OS information. I would like to do a very secure implementation. The biggest threat ...
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0answers
33 views

nmap -oG X.X.X.0-255 doesn't work and all my ports closed ( expected list of open ports ) [closed]

I'm running kali Linux on VirtualBox. I ran sudo ifconfig to get my IP and subnet mask (X.X.X.15 and 255.255.255.0 for eth0) I tried the command nmap -oG X.X.X.0-255 -vv but I got Read data files ...
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1answer
61 views

Blocking network scanning attempts at the switchport [closed]

Have noticed that I can scan the network though I have set an arp limit rate on the Cisco switch switchport and need some recommendations. The previous engineer set an arp rate limit of 200 and ...
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1answer
43 views

In hping3, What is “win=x”

In the verbose output of hping3, what is win=x. For example, len=46 ip=4.2.2.1 ttl=56 DF id=32841 sport=52 flags=RA seq=2 win=0 rtt=285.4 ms len=46 ip=4.2.2.1 ttl=56 DF id=32842 sport=52 flags=RA seq=...
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2answers
80 views

What are the advantages of port scanning?

It seems like all the google results to this question answer what port scanning is, but go into little detail about how a pentester or hacker could use the information about what ports a network has ...
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1answer
55 views

What happens when attacker scan a IP that is used by multiple devices? [duplicate]

Assuming ISP gives only 1 external IP and you have few devices that use this IP. So you will have a router and few PC's with same external IP and different local IP. When all PC's are online and one ...
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1answer
74 views

How long does a secret URL need to be?

I'm currently creating a small service where users can upload images (just a free time project). The images are either private, public (unlisted) or public (listed). Now I'm wondering for public ...
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2answers
109 views

Nmap scanning with and without proxychains has different behaviour

I'm doing a nmap scan to my own machine to my own machine. First of all I set the port 333 to listen with this command sudo nc -lvnp 333 On the other terminal I run sudo nmap -O -sV -p 0-65535 IP ...
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4answers
3k views

Web sites executing local port scans: Is this coming from a library? Can it be blocked?

I recently read a piece by an infosec analyst who observed ebay.com doing a local port scan. I could not believe my eyes, but it was quickly reproduced by me (see below for my observation). I surfed ...
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0answers
76 views

Very odd traffic - is it legit?

While troubleshooting an unrelated network problem, I noticed an interesting pattern on one of our networks for the last few days (at least). Before crying wolf, I wanted to see if somebody here may ...
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0answers
137 views

Host not connected to my router shows up in a nmap scan

After scanning my local network with nmap, this host shows up listed as a nmap result but it is the only host that shows on nmap that is not listed as a client on my router list of connected devices. ...
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0answers
107 views

Secure MPLS configuration: Does TCP port 646 (LDP) need to be generally exposed?

I am looking for expertise on MPLS configurations and security. A recent scan of my organization's public IPv4 perimeter networks using Rapid7 InsightVM has discovered a system which appears to be ...
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0answers
91 views

Concerns about Fing scanner [closed]

For years I have been using the Fing iOS app to scan my home network to check for unknown devices. The iOS apps is nice and self contained, so I never worried much about its own security. I recently ...
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1answer
109 views

Got requests to unpublished services. Am I being spied on?

Just today I'm migrating some of my webpages to a new server. After a couple hours the services was ready, I set up a hosts file with my domain example.com pointing to the server address, went to my ...
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1answer
105 views

Using an active or passive scan, can I detect all devices connected to or transmitting via a Wifi network?

I know that it's possible to do a passive scan on all channels to see if an access point sends a beacon. However, is it also possible to listen to general Wifi traffic on that channel and assemble a ...
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476 views

Packet Capturing with 2 or more SSL Certificate

To capturing the packet from android application, I configurated proxy likes below. Physical :::: [Mobile Device] -------------------- [PC] ------------------- [Server] Installed :::: [Packet ...
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1answer
76 views

pycharm opening ports [closed]

By running a simple port scan, I have noticed that pycharm is opening three ports on the machines it is installed on. Pycharm is a great tool for developer, but it seems fairly awful to me on the ...
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0answers
130 views

Is there an updated (non-Nmap) top 100 or top 1000 common ports list?

I know Nmap has nmap-services file which gives us the list of top 1000 ports/services found on the Internet. But this list seems to be outdated, as the Nmap top 1000 list doesn't include several ...
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1answer
68 views

Local Scans initiated from a VLAN Broadcast IP address

Just reviewing some logs and I am seeing local scans to several local IP addresses on port 137 within my network. The source IP however is the broadcast IP of the VLAN (.255). I have checked the ...
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1answer
563 views

Unkown ip adress in my lan [duplicate]

While scanning my LAN with Angry IP Scanner, I found an ip @ that I didn't recognise 192.168.1.59: IP Ping Hostname MAC Address MAC Vendor ...
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1answer
102 views

Scapy: Sending forged Probe Requests and capturing them in a different device

Objective: Sending a forged Probe Request frame from one machine and capturing it on a second machine. I have two codes running: sender.py interface = sys.argv[1] dot11 = Dot11(addr1='ff:ff:ff:ff:...
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1answer
107 views

Is there any method or tool other than nmap for the detection of an OS?

I wanted to know if there was any other way to detect the OS of a network (other than nmap) since nmap doesn't detect most versions of Windows 10 at all and identifies them as a different OS ...
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1answer
363 views

Nmap giving different result between Mac OS scan and Linux (Kali) scan [closed]

I try to do a simple TCP scan on an Kubunt VM (is on VirtualBox), from two different OS. From the Host (Mac OS system) and from a Kali Linux VM (tried VirtualBox and Parallels also). Kali Linux (...
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2answers
281 views

How to Defend Against Port Scan Attacks

I was told that Hackers scan for open ports in random IPs and if they are open they hack the computer. What open ports can be hacked? How do I close the ports?
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0answers
148 views

Where to run long automated scans? [closed]

I'm trying to run some automated scans without stopping for long periods of time (each scan can take anywhere from 8 hours to 3 days). I currently don't have a PC I can leave running for many days ...
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0answers
43 views

Router reboots when doing port scan [closed]

This question is very much related to Router reboots when using Nmap, the difference is that I'm actually interested in a practical solution to this problem. I have a piece of C code that is doing ...
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1answer
430 views

Pentesting: Active vs Passive Scan [closed]

I couldn't find answers to this question on this forum so I'm just gonna ask: What are Active Scans and Passive Scans? What are their differences? Please include in your answer(s): differences in ...
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2answers
213 views

Did I just find a bug in CloudFlare or is this a feature?

While doing penetration testing for a client I stumbled upon a security incident. CloudFlare promises to hide the origin IP address when using its DNS. I went to dnsdumpster.com, inputted my client's ...
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1answer
177 views

Nmap scan slow on some IP ranges [closed]

I'm a security newbie trying to scan a VPN in the range 10.0.0.0 - 10.0.15.254 using nmap on Kali Linux. The routing table: route -n Kernel IP routing table Destination Gateway Genmask ...
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0answers
101 views

Port scanning - Idle scan 2.0?

I have some server applications and from time to time I'm being victim of some attacks which might be of interest and I'm going to describe in the following. The most recent attack originated from ...
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1answer
219 views

Firebase ports scanning using nmap

Purely for research purposes used nmap to check security of my application deployed to Firebase. However, there some questions which I can't understand: Why Firebase has open so many ports? Something ...
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1answer
285 views

Malicious IP addresses [closed]

I am looking for updated lists of IP addresses that belong to malware's C&C, botnets, malicious scanners, or other sort of malicious activities. Is there any public database of malicious IP ...
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1answer
136 views

Hardening against Nmap and other network scanners

It is possible to make Server respond with irrelevant data if it is scanned with Nmap? If yes, are there any examples of such SW?
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2answers
169 views

Can wireshark capture the exact payload and end point of API used by my Mobile APP?

I was just wondering if someone having total control over his/her network, is running my mobile app. Also wireshark is capturing all requests made using the network. My app is calling API endpoint ...
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1answer
176 views

Incorrect results via Nexpose, but displaying correct one with Nmap

We are scanning our network via Nexpose. Recently an asset was found vulnerable to Wannacry CVE 2017-0146 SMB Remote code execution vulnerability. However when i have tested it same through Nmap it ...
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0answers
1k views

How secure is my apartment's building wide wifi network using Spectrum Community Solutions?

Recently my apartment moved from having individual modems (with our own router/wifi network) to this Spectrum Community Solutions building wide network. Everyone can connect to the network anywhere, ...
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1answer
69 views

Finding location of malicious internal IP in Wide Area Network [closed]

Malicious Traffic detected from an internal IP in Wide Area Network (Network of multiple cities in a country). How to find the city of that IP address in Wide Area Network? There is no IP subnet by ...
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1answer
373 views

How to find out which application runs behind port 31337?

I found an open port on a "Kartina Quattro" (https://www.kartina.tv/article/247-kartina-quattro). It's a device for watching russian TV channels. The port number is 31337 and the Service is called ...
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1answer
248 views

Advice to detect suspicious activities on network

A private network (about 150 PCs) is connected to the internet through an edge router. According to the net admin, his network is scanned from the outside, at the edge router. I don’t have any more ...
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4answers
884 views

Router Receiving Unknown Packets from the Same IP and Port Even After Address Rotations - How?

One of our client's routers is receiving packets from the same source IP address and port repeatedly, even when the router is rebooted and obtains a fresh dynamically assigned IP address, and while no ...
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2answers
1k views

Open ports on my NetGear router

I ran an nmap scan on my home router and I am seeing a ton of open ports. Is this normal? How do I go about closing them? $ nmap 192.168.1.1 Starting Nmap 7.70 ( https://nmap.org ) at 2019-03-16 20:...
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0answers
29 views

Nmap showing different open ports every few seconds [duplicate]

I'm running Nmap on an Amazon Web Services EC2 instance but between runs just a couple seconds apart, I'm getting new results. Is this normal? I'm seeing open ports then they don't show. I'm running ...
3
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1answer
3k views

NMAP results inconsistent

I'm doing a NMAP scan that runs continuously. For some reason the results are not consistent. Sometimes it detects all the connected devices of the local network and sometimes only some of them. ...
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1answer
2k views

TCP Scans vs SYN Scans in port scanning

What is the difference between TCP Scans and SYN Scans?
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2answers
949 views

nmap - Difference between “Filtered” and “Admin-Prohibited”

I am a rather new user to nmap. By using some Google-Fu, I am still not able to ascertain what is the criteria used in order to distinguish "filtered" ports from "admin-prohibited" as they both seem ...
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2answers
2k views

Is there a way to see if an nMap scan in the background is progressing?

I have launched an nMap scan from an Ubuntu machine with the following parameters: nmap -Pn -T3 -sS -sV -iL /home/tsouser/Desktop/Scope.txt --reason --top-ports 100 --max_rtt_timeout 200ms --...
44
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3answers
10k views

Does a fake SSH server have any purpose security-wise?

I stumbled upon this sshesame software which appears to imitate an SSH server accepting any username/password, only instead of executing the subsequent shell commands it logs them in a file. What I ...
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0answers
571 views

Why nmap password scanner completes in 10 seconds and doesn't give any result?

I'm completely new to nmap and I'm trying to brute force passwords on a target. A command that I'm trying is: nmap -p 80 --unprivileged --script http-form-brute <target> But instead of "...

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