When an attacker successfully compromise a system they need to maintain the connection, that's why the attacker usually installing backdoor on victim computer for future use to make attacker easily connect to victim computer to use victim resource, and collecting data on victim computer.
Are you sure netcat can be used as a backdoor? yes sure of course ? In this tutorial I will write down the technique to set up the famous listener application NetCat as a backdoor for Windows system when attacker successfully compromised victim computer and gaining meterpreter access.
How To Install Netcat On Windows 7
4. The next step we need to configure the registry to make NetCat execute on Windows start up and listening on port 443. We do this by editing the key 'HKLMsoftwaremicrosoftwindowscurrentversionrun'. Enumerate the supplied registry key :
7. Until this step everything looks okay, for the next step we need to alter the system to allow remote connections through the firewall to our netcatbackdoor using netsh command and open port 443 . run shell command from meterpreter to access command prompt, and then run :
10. Let's try our backdoor by restarting the victim computer by using reboot command from meterpreter or shutdown -r -t 00 from windows console and try again to connect using NetCat in step 9.
I used to use netcat for Windows to help track down network connectivity issues. However these days my anti-virus software (Symantec - but I understand others display similar behaviour) quarantines netcat.exe as malware.
This person ran into the exact same problem; read till the end for the version compiled without remote execution. I downloaded and extracted these on two systems running 'Symantec Endpoint Protection'. While the netcat on this page was removed and quarantined when run, the 'rodneybeede' version linked to near the end of the page tried to connect to the desired port, and wasn't quarantined.
I discovered that MobaXterm for Windows has the nc (netcat) command, as well as many other Unix commands, like ls, ps, and kill.
I wholeheartedly recommend MobaXterm, especially if you are familiar with both Unix and DOS. For me, there was nothing to install; it's just one executable that opens a terminal window in Windows that accepts many Unix commands. Since I frequently use both Unix and DOS and often use one to connect to the other, MobaXterm for Windows is an extremely useful tool for me.
You can also use Netcat to create a simple command-line messaging server instantly. As in the previous usage example, nc must be installed on both systems used for the chat room.
You can as well run Netcat as a backdoor. However, this calls for more work. If Netcat is installed on a target server, you can use it to create a backdoor, to get a remote command prompt.
You can pair netcat with tcpdump to stream a packet capture to another host. This is useful for capturing in real time traffic on busybox or other small Linux distributions.
In this article, I will take you through the steps to install netcat(nc) command on Linux(Ubuntu 18.04 /20.04) in 7 Easy Steps. nc is a free and open source utility to read and write data across networks using UDP or TCP connections. It is a very handy tool often used by Linux and System Administrators to perform various network related tasks. It provides excellent port scanning and listening capabilities, be it a TCP or UDP traffic.
Along with this you can also use this utility to transfer a file based on the specific port number. We will see some more important features in upcoming articles but for now we will the steps to install netcat(nc) utility on Ubuntu 18.04/20.04 based systems in great detail. More on netcat(nc) Man Page.
Before installing any new package in the System, it is always advisable to check for any latest available updates using apt-get update command as shown below. If any of the package needs upgradation, then upgrade it by using apt-get upgrade command.
Now that netcat(nc) is installed in the System, it is time to test this utility. This can be done by checking Let's say google.com remote https port by using nc -vz google.com 443 command as shown below.
In this article, i will take you through the steps to install netcat command in Linux. nc command in Linux can be used for variety of purposes like checking the status of remote ports, initiating chat services between server and client, start listening on some ports for incoming connections etc. Now a days there are lot of open source networking tools available in Linux Based Systems to perform network troubleshooting activity. netcat is one such tool.
In this session we will only look into the steps to install netcat on RedHat Based Systems. I will cover other networking tools in future articles. Since netcat package does not comes by default in RedHat Based systems, so we need to install it manually using below steps.
You need update all the packages to use latest updates before proceeding with the netcat package installation. Packages can be updated by running yum install -y command as shown below. In this case, since system has all the latest updates installed hence there are no further updates available to install.
Once system is updated you can install netcat package using yum install -y nc command as shown below. This command will also install any dependent packages which needs to be installed with netcat package.
Now that we have netcat package installed successfully in the System, you can quickly verify the functionality of nc command by checking google.com port 443 as shown below. As you can check in the below output, system is currently able to reach to google.com on port 443.
Netcat also supports listening on ports for incoming connections, as well as basic port scanning and some other niceties. These features and the fact that lots of operating systems install Netcat but not telnet by default are why some sysadmins are starting to use Netcat instead of telnet for their troubleshooting needs.
Netcat is a communication tool through TCP and UDP ports. Using this tool, you can establish a connection between two operating systems. Netcat tool is considered an important tool among pentesters and has many uses. It is interesting to know that the Netcat tool is extremely useful and every hacker (Pentester) should know how to work with this wonderful tool. This tool is known as the versatile Swiss Army knife and is known by the command nc. This tool can be installed on Windows and Linux. In this article, we are going to teach you 3 steps to install Netcat on MacOS. If you want to buy VPS server, you can visit the packages offered on the Eldernode website.
After you open the terminal, at this stage you must type the following command and then run it. By doing this you will be able to install Homebrew on MacOS. Note that installing Homebrew requires installing netcat:
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