How to find a backdoor shell listening on a port

Hidden Backdoors, Trojan Horses and Rootkit Tools in a Windows Environment

how to find a backdoor shell listening on a port

Jan 23, Once connected, it will have spawned a remote shell on the server (using Its additional advantage is that it does not listen in on any port but .. to install a backdoor, the firewall will block him from getting to the listening port.

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Some days ago it became public knowledge that some routers, that's devices used for establishing Internet connections among other things, are listening on the undocumented port First, it was only discovered in one device, the Linksys WAGG, but it was soon discovered that many routers were also listening on that port. The list on the Github website is large, and it is likely that here are other routers affected not listed there yet. It seems to be predominantly Cisco, Linksys and Netgear which listen on the port, even though not all routers by the mentioned companies are affected by it. It is currently not known why the routers are listening on that port. Many have suggested that this is yet another way for the NSA to spy on people around the world, and while that is a possibility, it is not the only one. If your router is not on the positive or negative list, you may want to find out if it is listening on port , and if it is, stop the process to protect your systems.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Information Security Stack Exchange is a question and answer site for information security professionals. It only takes a minute to sign up. Suppose I am doing a penetration test on a network that has a firewall that blocks all ports except 80, , and I want to use a metasploit reverse-TCP backdoor executable written in msfpayload to initiate a connection with a remote server that has a listener running.

Abstract: Backdoors are often installed by attackers who have compromised a system to ease their subsequent return to the system. We consider the problem of identifying a large class of backdoors, namely those providing interactive access on non-standard ports, by passively monitoring a site's Internet access link. We develop a general algorithm for detecting interactive traffic based on packet size and timing characteristics, and a set of protocol-specific algorithms that look for signatures distinctive to particular protocols. We evaluate the algorithms on large Internet access traces and find that they perform quite well. In addition, some of the algorithms are amenable to prefiltering using a stateless packet filter, which yields a major performance increase at little or no loss of accuracy. However, the success of the algorithms is tempered by the discovery that large sites have many users who routinely access what are in fact benign backdoors, such as servers running on non-standard ports not to hide, but for mundane administrative reasons. Hence, backdoor detection also requires a significant policy component for separating allowable backdoor access from surreptitious access.

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Not every case of a successful intrusion is "crowned" with a replaced Web site on the server, data theft or damage. Often electronic intruders do not wish to create a spectacle but prefer to avoid fame by hiding their presence on compromised systems, sometimes leaving certain unexpected things. They use sophisticated techniques to install specific "malware" backdoors to let them in again later with full control and in secret. Obviously, hackers have a variety of motives for installing malevolent software malware. These types of software tend to yield instant access to the system to continuously steal various types of information from it - for example, strategic company's designs or numbers of credit cards.



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System administrators are constantly being advised to check their systems for open ports and services that might be running that are either unintended or unnecessary. In some cases, the services might be Trojans just waiting to be exploited. The most common host-based tool for checking for open ports on Windows or Unix systems is the netstat command.

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4 COMMENTS

  1. Cessmorethha says:

    Popular Posts

  2. Bowspeleko says:

    tcp - Possible to backdoor a Netcat Listener? - Information Security Stack Exchange

  3. David L. says:

    So if you need to use an in-use port, how do you tell what application is holding it?

  4. Wayne D. says:

    Jan 6, router-backdoor. If your router is not on the positive or negative list, you may want to find out if it is listening on port , and if it is, stop the.

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