{"id":84548,"date":"2026-03-02T11:04:50","date_gmt":"2026-03-02T11:04:50","guid":{"rendered":"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/?p=84548"},"modified":"2026-04-10T14:03:48","modified_gmt":"2026-04-10T14:03:48","slug":"netcat-penetration-testing-tutorial","status":"publish","type":"post","link":"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/penetration-testing\/netcat-penetration-testing-tutorial\/","title":{"rendered":"Mastering Netcat in Penetration Testing: A Step-by-Step Tutorial"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"84548\" class=\"elementor elementor-84548\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a47fe89 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a47fe89\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f602312\" data-id=\"f602312\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0c1deb0 elementor-widget elementor-widget-heading\" data-id=\"0c1deb0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Mastering Netcat in Penetration Testing: A Step-by-Step Tutorial<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c0ed64 elementor-widget elementor-widget-post-info\" data-id=\"2c0ed64\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-5dadb57 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>March 2, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-cba0dde elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-custom\">\n\t\t\t\t\t\t\t\t\t\tMarcelo Diniz\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-45d48a4 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-custom\">\n\t\t\t\t\t\t\t\t\t\tPenetration Testing\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6f467be elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6f467be\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-842e33a\" data-id=\"842e33a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-199d8a0 elementor-widget elementor-widget-text-editor\" data-id=\"199d8a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Abstract:<\/strong> This article explains the use of the Netcat tool for penetration testing. It describes the Penetration Testing Execution Standard (PTES) phases and provides definitions of basic concepts in penetration testing environments. It also demonstrates the use of Netcat in real-world penetration testing situations. Additionally, it explains the three popular scenarios in penetration testing: port scanning, data exfiltration, and persistence.<\/p><p>The Penetration Testing Execution Standard (PTES) outlines seven main components of penetration testing. These components encompass every aspect of a penetration test, from the initial communication and rationale for conducting a <a href=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/penetration-testing\/what-is-penetration-testing\/\">penetration test<\/a> to the intelligence-gathering and threat-modeling phases, where testers try to understand the organization being tested. The process then moves into the vulnerability research, exploitation, and post-exploitation phases, where the testers&#8217; technical expertise is combined with a business understanding of the engagement. The process concludes with reporting, which communicates the entire testing process along with the results to the customer in a structured manner.<\/p><p>The seven components of PTES are:<\/p><ol><li>Pre-Engagement Interactions<\/li><li>Intelligence Gathering<\/li><li>Threat Modeling<\/li><li><a href=\"https:\/\/www.eccouncil.org\/train-certify\/certified-penetration-testing-professional-cpent\/\">Vulnerability Analysis<\/a><\/li><li>Exploitation<\/li><li>Post-Exploitation<\/li><li>Reporting<\/li><\/ol><p>Before demonstrating the use of Netcat in real-world penetration testing situations, let&#8217;s review some basic concepts. An exploit is a method used to take advantage of a flaw in the target; a payload is a code that will be executed once the attacker accesses the target; a shellcode is a set of instructions typically written in assembly code or hexadecimal format that can be used as payload; and finally, a vulnerability is a flaw that could be used by an attacker to compromise the target.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2f76044 elementor-widget elementor-widget-heading\" data-id=\"2f76044\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Netcat in Penetration Testing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c236496 elementor-widget elementor-widget-text-editor\" data-id=\"c236496\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Netcat is a simple and powerful tool to help achieve some tasks during penetration testing. It is a robust Transmission Control Protocol\/Internet Protocol (TCP\/IP) and User Datagram Protocol (UDP) utility tool and can handle a variety of system and network-related functions. Netcat is not the best tool for port scanning available, but it can handle this task. By default, it uses the TCP protocol for all options, including port scanning. Originally released in 1996, Netcat is a networking program designed to write and read data across a network using TCP and UDP. It is also considered a network version of the popular Linux-based program cat. Cat reads and writes information to files; Netcat reads and writes information across network connections. Netcat has been rewritten into several versions and implementations and ported to numerous operating systems.<\/p><p>This tool is very versatile and capable of executing different types of functions in penetration test operations, such as the ones listed below:<\/p><ul><li>Port scanning<\/li><li>Tunneling<\/li><li>Proxying<\/li><li>Port forwarding<\/li><li>Transferring files<\/li><li>Grabbing banners<\/li><\/ul><p>Netcat has two modes of operation: client mode and server mode, which depend on the switch options used in the command line prompt. The basic Netcat modes of operation are:<\/p><ul><li>connect to somewhere: nc [-options] [hostname] [ports]<\/li><li>listen for inbound: nc -lp [port] [options] [hostname]<\/li><\/ul><p>The most common options used in Netcat are:<\/p><ul><li><strong>-h<\/strong> displays help commands\/options.<\/li><li><strong>-l<\/strong>, for listen, is the server mode.<\/li><li><strong>-e<\/strong> allows Netcat to execute a specified program when a client connects to it. This is a powerful switch. It allows an incoming client to connect to Netcat for direct shell access, without user identification or an authentication process.<\/li><li><strong>-v<\/strong> controls verbosity.<\/li><li><strong>-w<\/strong> sec sets the network inactivity timeout.<\/li><li><strong>-z<\/strong> instructs Netcat to scan ports without establishing a connection.<\/li><li><strong>-n<\/strong> stops Netcat to perform domain name resolution.<\/li><\/ul><p>The following are common scenarios in a penetration test:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7499b6c elementor-widget elementor-widget-heading\" data-id=\"7499b6c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. Port Scanning<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-79b7e65 elementor-widget elementor-widget-text-editor\" data-id=\"79b7e65\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/penetration-testing\/preventing-malicious-hacks-with-port-scanning-techniques\/\">Port scanning<\/a> and service identification play a large role during a penetration test. Identifying the service or server version running on a system is very important for determining any potential vulnerabilities.<\/p><p>Netcat port scanning options are:<\/p><ul><li><strong>-v<\/strong> enables verbose output, resulting in Netcat showing what is going on for each step that the tool takes when executing an inner command or when receiving an external command.<\/li><li><strong>-vv<\/strong> produces more verbose output.<\/li><li><strong>-z<\/strong> enables port scanning without establishing a connection.<\/li><li><strong>-n<\/strong> disables domain name resolution in Netcat. Examples:<ul><li>nc -vlkp 8080<\/li><li>nc -vnz 127.0.0.1 8078-8082<\/li><\/ul><\/li><\/ul><p>Figure 1 shows the procedure of port scanning with Netcat. The image on the left shows Netcat opening port 57222 and waiting for a connection from anyone. In the image on the right, the port scanning procedure starts with the -z option, which scans without establishing a connection on a specific port, in this case, port 57222. When Netcat arrives at this port, it avoids establishing a connection and gets only the port&#8217;s status; in this example, port 57222 is open.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf88c86 elementor-widget elementor-widget-image\" data-id=\"cf88c86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1950\" height=\"532\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2.png\" class=\"attachment-full size-full wp-image-84550\" alt=\"Port scanning\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2-300x82.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2-1024x279.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2-768x210.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-2-1536x419.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1: Port scanning<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c0e797e elementor-widget elementor-widget-text-editor\" data-id=\"c0e797e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In the operating systems, it is possible to see which services are running on the machine and have a map between the service and the ports that are being used. It is possible to have this information using any Linux distribution system or Microsoft Windows, using the path below:<\/p><ul><li><strong>\/WINDOWS\/system32\/drivers\/etc\/services<\/strong><\/li><li><strong>\/etc\/services<\/strong><\/li><\/ul><p>Figures 2 and 3 show the paths and the contents of the file services for Windows and Linux, respectively. The content of the file services shows the network services of the current machine, the services with the port, and which protocols are associated with the service.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c805f26 elementor-widget elementor-widget-image\" data-id=\"c805f26\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1950\" height=\"1388\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3.png\" class=\"attachment-full size-full wp-image-84551\" alt=\"Microsoft Windows network services\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3-300x214.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3-1024x729.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3-768x547.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-3-1536x1093.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2: Microsoft Windows network services<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-26530ec elementor-widget elementor-widget-image\" data-id=\"26530ec\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1950\" height=\"1880\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4.png\" class=\"attachment-full size-full wp-image-84552\" alt=\"Linux-based network services\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4-300x289.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4-1024x987.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4-768x740.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-4-1536x1481.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 3: Linux-based network services<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1997557 elementor-widget elementor-widget-text-editor\" data-id=\"1997557\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Figure 4 shows the result of the port scanning, targeting the range of ports in these predefined services on the host. In this scenario, the -vv option was used to generate an extra level of detail (verbosity) in the command result. The target machine was the host 192.168.0.8. It is possible to verify the result of the port scanning; the scanning was able to pass in the range of ports. For each port, it was possible to identify the port, the services using this specific port, and the status of that port. Figure 4 shows the port status as &#8220;Connection refused.&#8221; Some possibilities for this status are given below:<\/p><ul><li>The port is not open on the destination machine.<\/li><li>The port is open on the destination host, but its pending connections are full.<\/li><li>There is a firewall between the client and the server.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b99a417 elementor-widget elementor-widget-image\" data-id=\"b99a417\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1782\" height=\"1956\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5.png\" class=\"attachment-full size-full wp-image-84553\" alt=\"Port scanning result\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5.png 1782w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5-273x300.png 273w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5-933x1024.png 933w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5-768x843.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-5-1399x1536.png 1399w\" sizes=\"(max-width: 1782px) 100vw, 1782px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 4: Port scanning result<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aff651d elementor-widget elementor-widget-heading\" data-id=\"aff651d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. Data Exfiltration<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1312794 elementor-widget elementor-widget-text-editor\" data-id=\"1312794\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Data exfiltration, also known as data extrusion, data exportation, or data theft, could be defined as the unauthorized transfer of often sensitive data from a computer or other device. It can also happen through an attacker gaining authorized access to the target device and then starting a remote shell. This allows an incoming client to connect to Netcat for direct shell access. There is no user identification or authentication process associated with this access.<\/p><p>An example of sensitive data that could be exfiltrated is information in password folders or log files. In Linux, the log files are located in <strong>\/var\/log<\/strong>, a special directory for storing logs. This directory contains logs from the operating system, services, and various apps running on the operating system.<\/p><p>In Microsoft Windows, those log files are present at <strong>C:\\WINDOWS\\system32\\config\\<\/strong>. In Linux, the password files are present in a composition of two files: password and shadow, in the <strong>\/etc<\/strong> folder. The password file contains the user&#8217;s public information (UID, full name, home directory), whereas the shadow file contains the hashed password and the password expiry data.<\/p><p>A good and efficient way to copy a collection of files is to use the <strong>tar<\/strong> command, which is a tape archive that can be used to easily archive a large collection of files into a single file. Below are some common command options:<\/p><ul><li><strong>-c<\/strong> &#8211; create new file<\/li><li><strong>-v<\/strong> &#8211; verbose mode<\/li><li><strong>-z<\/strong> &#8211; compact file<\/li><li><strong>-x<\/strong> &#8211; extract file<\/li><li><strong>-p<\/strong> &#8211; preserve permissions<\/li><\/ul><p>Figure 5 shows an exchange of data through a point-to-point connection using Netcat. On the left, we have a Netcat command listening on <strong>port 4444<\/strong>, followed by a &lt; symbol and a file. This command means that a file named shell.exe will be the input when a connection through <strong>port 4444<\/strong> is established. After the connection, <strong>73802 bytes<\/strong> were sent, and an MD5 hash was sent to the server to compare the file&#8217;s integrity. If even a single bit of the file is changed, the hash will be modified. On the right of Figure 5, we have a connection on <strong>port 4444<\/strong>, followed by the &gt; symbol and a file named dump.hex. This means the output of the connection will be sent to dump.hex. It is possible to verify that the same <strong>73802 bytes<\/strong> were transferred, and the MD5 hash of the file transmitted matches. This shows that the file&#8217;s integrity was preserved.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c3c7e94 elementor-widget elementor-widget-image\" data-id=\"c3c7e94\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1950\" height=\"360\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6.png\" class=\"attachment-full size-full wp-image-84554\" alt=\"A copy of a file using Netcat\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6-300x55.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6-1024x189.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6-768x142.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-6-1536x284.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 5: A copy of a file using Netcat<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92d3094 elementor-widget elementor-widget-text-editor\" data-id=\"92d3094\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Figures 6 and 7 show a data exfiltration technique targeting the tar file and the log files. On the left side of Figure 6, we have the tar command creating a new, compact file of the contents of the <strong>\/var\/log<\/strong> folder and the pipe command, which means what we have on the left will be the input for what we have on the right. Then we have a connection with Netcat pointing to <strong>port 4444<\/strong>. On the right side of Figure 6, we have a connection listening on <strong>port 4444<\/strong>, which means the Netcat instance on the left will connect to the Netcat instance on the right, and the tar command will extract the result of this connection. This technique is very interesting and effective for copying several files.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1778f78 elementor-widget elementor-widget-image\" data-id=\"1778f78\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1950\" height=\"1244\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7.png\" class=\"attachment-full size-full wp-image-84555\" alt=\"Data exfiltration using Netcat and the tar command\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7-300x191.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7-1024x653.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7-768x490.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-7-1536x980.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 6: Data exfiltration using Netcat and the tar command<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c45dbd7 elementor-widget elementor-widget-text-editor\" data-id=\"c45dbd7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The result of copying the files from the <strong>\/var\/log<\/strong> path on the host target to the remote host is shown in Figure 7.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59f00fa elementor-widget elementor-widget-image\" data-id=\"59f00fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"466\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8.png\" class=\"attachment-full size-full wp-image-84556\" alt=\"The result of data exfiltration\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8.png 1600w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8-300x87.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8-1024x298.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8-768x224.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-8-1536x447.png 1536w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 7: The result of data exfiltration<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-496658a elementor-widget elementor-widget-heading\" data-id=\"496658a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3. Persistence<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ccb98fb elementor-widget elementor-widget-text-editor\" data-id=\"ccb98fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Persistence means using a mechanism to guarantee that one component will always be available. Persistence with Netcat means to put an instance of Netcat that is always available for connections. In this scenario, there are some steps and options to follow and use. Below, you will find out how to use some configurations to put a Netcat instance in the <strong>Microsoft Windows Registry<\/strong>. Some of these steps will be out of scope; for example, to start some operations in the Windows Registry, we need to escalate our privileges. To do this, we must find a vulnerability in the target machine to run an exploit. Tools such as <a href=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/ethical-hacking\/metasploit-framework-guide\/\">Metasploit<\/a> can run a Windows User Account Control <strong>(UAC)<\/strong> exploit, gain administrator access, and execute these operations on the Microsoft Windows Registry.<\/p>\n<p>To explore a persistent <strong>Netcat backdoor<\/strong>, we can either install a Netcat backdoor on the target machine with a copy of Netcat available on our Kali Linux system or use the Netcat already installed on the target operating system. In this example, we will use a Netcat version from the Nmap project that is already installed on the Windows system of the target machine.<\/p>\n<p>We can use the <strong>Windows Registry keys<\/strong> to execute Netcat at the startup of the remote host and listen on the desired port. The path to the CurrentVersion and then Run is where the applications that will be executed at the startup of Microsoft Windows are located.<\/p>\n<p><strong>HKLM\\software\\microsoft\\windows\\currentversion\\run<\/strong><\/p>\n<p>We can optionally run this key to enumerate the values, as shown in Figure 8.<\/p>\n<p><strong>reg query HKLM\\software\\microsoft\\windows\\currentversion\\run<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2caa0b elementor-widget elementor-widget-image\" data-id=\"e2caa0b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1950\" height=\"162\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9.png\" class=\"attachment-full size-full wp-image-84557\" alt=\"Query Microsoft Windows Registry\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9.png 1950w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9-300x25.png 300w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9-1024x85.png 1024w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9-768x64.png 768w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/image-Picsart-AiImageEnhancer-9-1536x128.png 1536w\" sizes=\"(max-width: 1950px) 100vw, 1950px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 8: Query Microsoft Windows Registry<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c60bf8a elementor-widget elementor-widget-text-editor\" data-id=\"c60bf8a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To add our instance of Netcat, we must use the <strong>reg add<\/strong> command and options such as those listed below:<\/p><ul><li><strong>\/v<\/strong> specifies the name of the value.<\/li><li><strong>\/d<\/strong> specifies its data.<\/li><li><strong>\/t<\/strong> specifies the value&#8217;s data type.<\/li><li><strong>\/ve<\/strong> is used to write a key&#8217;s default value.<\/li><\/ul><p>The final command will be:<\/p><p><strong>reg add HKLM\\software\\microsoft\\windows\\currentversion\\run \/v ncat \/t REG_SZ <\/strong><br \/><strong>\/d &#8220;C:\\Program Files (x86)\\Nmap\\ncat.exe -lp 4444 -e cmd.exe&#8221;<\/strong><\/p><p>A remote firewall can interrupt the Netcat connection, so the firewall settings need to be modified. <strong>Netsh<\/strong> is a console utility that allows changing many network-related parameters. The following command can be executed to view all the available profiles:<\/p><p><strong>netsh firewall show opmode<\/strong><\/p><p>It is now possible to add a TCP port exception to allow Netcat to listen and communicate back to the host user when prompted; however, this operation requires elevation and must be run as <strong>administrator<\/strong>.<\/p><p><strong>netsh advfirewall firewall add rule name=&#8221;TCP Port 4444&#8243; dir=in action=allow protocol=TCP localport=4444<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-061212c elementor-widget elementor-widget-heading\" data-id=\"061212c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bcfd10f elementor-widget elementor-widget-text-editor\" data-id=\"bcfd10f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This article highlights the important points of PTES, outlining its components. It also provides definitions of commonly used terms in cybersecurity. Netcat was demonstrated across most scenarios in a penetration test, highlighting its versatility in penetration testing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f5bbc5 elementor-widget elementor-widget-heading\" data-id=\"0f5bbc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cybersecurity Tips<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e9c1ad1 elementor-widget elementor-widget-text-editor\" data-id=\"e9c1ad1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Get a deep understanding of PTES and its components.<\/li><li>Understand how to use Netcat for port scanning, file transfer, and persistence.<\/li><li>Try to understand how the Microsoft Windows Registry works and why it is so important to query and add new keys to manipulate the system operation.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5a1e332 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5a1e332\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0ea06ec\" data-id=\"0ea06ec\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-39986f3 tags-cloud elementor-widget elementor-widget-heading\" data-id=\"39986f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">About the Author <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-8dc9cb4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8dc9cb4\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-b0dc673\" data-id=\"b0dc673\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bedaa33 elementor-widget elementor-widget-image\" data-id=\"bedaa33\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"476\" height=\"417\" src=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/marcelo-diniz-image.png\" class=\"attachment-full size-full wp-image-84558\" alt=\"Marcelo Diniz - Security researcher &amp; senior software engineer\" srcset=\"https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/marcelo-diniz-image.png 476w, https:\/\/www.eccouncil.org\/cybersecurity-exchange\/wp-content\/uploads\/2026\/03\/marcelo-diniz-image-300x263.png 300w\" sizes=\"(max-width: 476px) 100vw, 476px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b1802bb elementor-widget elementor-widget-heading\" data-id=\"b1802bb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Marcelo Diniz<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fdc2d02 elementor-widget elementor-widget-text-editor\" data-id=\"fdc2d02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4>Security researcher &amp; senior software engineer<\/h4>    \t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-9f69356\" data-id=\"9f69356\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-118b732 elementor-widget elementor-widget-text-editor\" data-id=\"118b732\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.linkedin.com\/in\/marcelo-diniz-7822767\/\" target=\"_blank\" rel=\"noopener\">Marcelo Diniz<\/a> is a security researcher and senior software engineer with expertise spanning several areas, including security research, vulnerability assessment, reverse engineering, malware research and analysis, digital forensics, threat detection engineering, threat hunting, cyber intelligence, and penetration testing. He is currently employed at Netskope within the malware detection efficacy team, which is part of the Netskope Threat Research division. 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