{"id":9640,"date":"2020-03-11T18:47:00","date_gmt":"2020-03-11T13:17:00","guid":{"rendered":"http:\/\/kalilinuxtutorials.com\/?p=9640"},"modified":"2020-03-11T18:47:00","modified_gmt":"2020-03-11T13:17:00","slug":"http-asynchronous-reverse-shell","status":"publish","type":"post","link":"https:\/\/kalilinuxtutorials.com\/http-asynchronous-reverse-shell\/","title":{"rendered":"HTTP Asynchronous Reverse Shell"},"content":{"rendered":"\n<p><strong>Http asynchronous reverse shell <\/strong>is a tool used for asynchronous reverse shell using the HTTP protocol. <\/p>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>Why ?<\/strong><\/p>\n\n\n\n<p>Today there are many ways to create a reverse shell in order to be \nable to remotely control a machine through a firewall. Indeed, outgoing \nconnections are not always filtered.<\/p>\n\n\n\n<p>However security software and hardware (IPS, IDS, Proxy, AV, EDR&#8230;) are more and more powerful and can detect these attacks.\nMost of the time the connection to a reverse shell is established through a TCP or UDP tunnel.<\/p>\n\n\n\n<p>I figured that the best way to stay undetected would be to make it  look like legitimate traffic. The HTTP protocol is the most used by a standard user. Moreover it is  almost never filtered so as not to block access to websites.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-uFhmDJx7Rfk\/XmjVusRAoSI\/AAAAAAAAFZk\/xXxe-CvQuhoVL7W3foW-IR1R-DH3o8RGACLcBGAsYHQ\/s1600\/HTTP-1.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>How it works ?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The client app is executed on the target machine.<\/li><li>The client initiates the connection with the server.<\/li><li>The server accepts the connection.<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>Then:<ul><li>The client queries the server until it gets instructions.<\/li><li>The attacker provides instructions to the server.<\/li><li>When a command is defined, the client executes it and returns the result.<\/li><\/ul><\/li><\/ul>\n\n\n\n<p>And so on, until the attacker decides to end the session. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-HlYEb1xB3Ag\/XmjVu3YD5yI\/AAAAAAAAFZg\/WDPMXg0OmXAxWB47NfF3ctX28Ag_2LkIgCLcBGAsYHQ\/s1600\/HTTP-2.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><strong>Also Read &#8211; <a href=\"https:\/\/kalilinuxtutorials.com\/raspberry-pi-imager\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Raspberry Pi Imager Utility 2020 (opens in a new tab)\">Raspberry Pi Imager Utility 2020<\/a><\/strong><\/p>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>Features<\/strong><\/p>\n\n\n\n<p>Today, as a poc, the following functionalities are implemented:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Fake HTTP traffic to appear as searches on bing.com.<\/li><li>Commands are base64 encoded in the HTML response.<\/li><li>The result of the commands is encoded in base64 as a cookie by the client.<\/li><li>[Optional] SSL support; by default it is a fake bing.com certificate.<\/li><li>Random delay between each client call to avoid triggering IDSs.<\/li><li>Random template is used for each response from the server.<\/li><li>Re-use of the same powershell process to avoid triggering EDRs.<\/li><li>Support for all Cmd and Powershell commands.<\/li><li>[Optional] The client can display a fake error message at startup.<\/li><li>The client is hidden from tasks manager.<\/li><li>[Optional] The client can be run as an administrator.<\/li><\/ol>\n\n\n\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/github.com\/onSec-fr\/Http-Asynchronous-Reverse-Shell#av-detection\"><\/a><\/h5>\n\n\n\n<h5 class=\"wp-block-heading\">AV Detection<\/h5>\n\n\n\n<p>Only 3 out of 69 products were able to detect the client as malicious, without applying any evasive or obfuscation techniques.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-x-jvX9zZ-40\/XmjVuhhVGOI\/AAAAAAAAFZc\/h2ezilxoaBcLvfqc7qc3LC5zTGM5i_CPgCLcBGAsYHQ\/s1600\/HTTP-3.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>Demonstration<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-h1nQxftwJVo\/XmjVvTzYoDI\/AAAAAAAAFZs\/taAPoZbTQq0rK9Kr2QbDdAnYBQfTYOBOgCLcBGAsYHQ\/s1600\/HTTP-4.gif\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Server side<\/strong> <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-DNAbD9N_RMw\/XmjVvupNrmI\/AAAAAAAAFZw\/nY9vCepuR0MSRB9noSVpfo9zPd2RGHBrgCLcBGAsYHQ\/s1600\/HTTP-5.gif\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>Configuration<\/strong><\/p>\n\n\n\n<p><strong>Client : C Sharp<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Open <em>HARS.sln<\/em> in Visual Studio<\/li><\/ol>\n\n\n\n<p><strong>Config.cs<\/strong><\/p>\n\n\n\n<p>This file contains parameters ; Assign the values you want :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Config\n    {\n        \/* Behavior *\/\n        \/\/ Display a fake error msg at startup\n        public static bool DisplayErrorMsg = true;\n        \/\/ Title of fake error msg\n        public static string ErrorMsgTitle = \"This application could not be started.\";\n        \/\/ Description of fake error msg\n        public static string ErrorMsgDesc = \"Unhandled exception has occured in your application. \\r\\r Object {0} is not valid.\";\n        \/\/ Min delay between the client calls\n        public static int MinDelay = 2;\n        \/\/ Max delay between the client calls\n        public static int MaxDelay = 5;\n        \/\/ Fake uri requested - Warning : it must begin with \"search\" (or need a change on server side)\n        public static string Url = \"search?q=search+something&amp;qs=n&amp;form=QBRE&amp;cvid=\";\n        \/* Listener *\/\n        \/\/ Hostname\/IP of C&amp;C server\n        public static string Server = \"https:\/\/127.0.0.1\";\n        \/\/ Listening port of C&amp;C server\n        public static string Port = \"443\";\n        \/\/ Allow self-signed or \"unsecure\" certificates - Warning : often needed in corporate environment using proxy\n        public static bool AllowInsecureCertificate = true;\n    }\n<\/code><\/pre>\n\n\n\n<p><strong>HARS.manifest<\/strong><\/p>\n\n\n\n<p>Change this line to run by default the client with certain privileges :<\/p>\n\n\n\n<p><code><strong>&lt;requestedExecutionLevel  level=\"requireAdministrator\" uiAccess=\"false\" \/&gt;<\/strong><\/code><\/p>\n\n\n\n<p>With<br><code><strong>&lt;requestedExecutionLevel  level=\"asInvoker\" uiAccess=\"false\" \/&gt;<\/strong><\/code><br> or<br><code><strong>&lt;requestedExecutionLevel  level=\"requireAdministrator\" uiAccess=\"false\" \/&gt;<\/strong><\/code><br> or<br><code><strong>&lt;requestedExecutionLevel  level=\"highestAvailable\" uiAccess=\"false\" \/&gt;<\/strong><\/code><\/p>\n\n\n\n<p><strong>Project properties<\/strong><\/p>\n\n\n\n<p>Here you can customize the assembly information and an icon for the file.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-P9rybTqkwng\/XmjVvuAivPI\/AAAAAAAAFZo\/zLHNvy8_wgMLI_keojoT2eE-vTra9F-BgCLcBGAsYHQ\/s1600\/HTTP-4.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Note :<\/strong> Target .NET framework version is set to 4.6 which is available by default in Windows 10.<\/p>\n\n\n\n<p>For Windows 7, choose .NET 3.5 if you don&#8217;t want to have to install missing features.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/github.com\/onSec-fr\/Http-Asynchronous-Reverse-Shell#build\"><\/a><\/h4>\n\n\n\n<p><strong>Build<\/strong><\/p>\n\n\n\n<p>Build the project from Visual Studio. The client should be generated in <code><strong>Http<\/strong> <strong>Asynchronous Reverse Shell\\HARS_Client\\HARS\\bin\\Release<\/strong><\/code> folder.<\/p>\n\n\n\n<p><strong>Done!<\/strong><\/p>\n\n\n\n<p><strong>Server : Python<\/strong><\/p>\n\n\n\n<p><strong>HARS_Server.py<\/strong> Location : <code><strong>Http Asynchronous Reverse Shell\\HARS_Server\\www<\/strong><\/code><\/p>\n\n\n\n<p>Simply change the port or location on the certificate if needed in the config section.<\/p>\n\n\n\n<p class=\"has-text-color has-background has-vivid-green-cyan-color has-very-dark-gray-background-color\"><strong># Config <\/strong><br>PORT = 443 <br>CERT_FILE = &#8216;..\/server.pem&#8217; <\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/github.com\/onSec-fr\/Http-Asynchronous-Reverse-Shell#run\"><\/a><\/h4>\n\n\n\n<p><strong>Run<\/strong><\/p>\n\n\n\n<p><code><strong>python HARS_Server.py<\/strong><\/code><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/github.com\/onSec-fr\/Http-Asynchronous-Reverse-Shell#notes\"><\/a><\/h4>\n\n\n\n<p><strong>Notes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>HTTP Logs are located in <strong><code>Http Asynchronous Reverse Shell\\HARS_Server\\logs<\/code>\\<\/strong><\/li><li>You can add your own templates (any html page) in <code><strong>Http Asynchronous Reverse Shell\\HARS_Server\\templates<\/strong><\/code><\/li><\/ul>\n\n\n\n<p class=\"has-background has-text-align-center has-light-green-cyan-background-color\"><strong>Disclaimer<\/strong><\/p>\n\n\n\n<p>This tool is only intended to be a proof of concept demonstration  tool for authorized security testing. Make sure you check with your  local laws before running this tool.<\/p>\n\n\n\n<div class=\"wp-block-button aligncenter is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-background has-vivid-cyan-blue-background-color\" href=\"https:\/\/github.com\/onSec-fr\/Http-Asynchronous-Reverse-Shell\"><strong>Download<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Http asynchronous reverse shell is a tool used for asynchronous reverse shell using the HTTP protocol. Why ? Today there are many ways to create a reverse shell in order to be able to remotely control a machine through a firewall. Indeed, outgoing connections are not always filtered. However security software and hardware (IPS, IDS, [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":16162,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/1.bp.blogspot.com\/-44l9zrnhGJM\/XmjW2eacEsI\/AAAAAAAAFaI\/y21Z6y6A8VQCEy-Z7YQeqvXhIfF0w-KwACLcBGAsYHQ\/s1600\/HTTP-1%25281%2529.png","fifu_image_alt":"HTTP Asynchronous Reverse Shell","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[28],"tags":[252,1552,2840],"class_list":["post-9640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kali","tag-asynchronous","tag-http","tag-reverse-shell"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>HTTP Asynchronous Reverse Shell!Kalilinuxtutorials<\/title>\n<meta name=\"description\" content=\"Http asynchronous reverse shell is a tool used for asynchronous reverse shell using the HTTP protocol. 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