During 24-26 September, we discovered a large malicious email (malspam) campaign distributing the Quasar remote administration tool. Quasar, a legitimate open-source remote administration tool (RAT), has been observed being used maliciously by Advanced Persistent Threat (APT) actors to facilitate network exploitation. These requests can be set as visible to the host user via a browser window that opens or invisible to the host user via the C# WebRequest class. KitPloit - leading source of Security Tools, Hacking Tools, CyberSecurity and Network Security ☣, Copyright © var creditsyear = new Date();document.write(creditsyear.getFullYear()); This User-Agent string mimics a Mozilla Firefox 48 browser running on Windows 8.1. After starting Quasar.exe for the first time, you will need to build a client for deployment. After a few seconds, a Settings dialog will pop up. Use the client builder to build your client otherwise it is going to crash. Receive security alerts, tips, and other updates. The distinctive first 4 bytes of the payload can be used to identify Quasar traffic. In this guide, we are going to manually install Quasar Burst on Kodi. NCCIC has leveraged Quasar’s use of Mac OS X to limit false positives in the Snort signatures for this activity. Listening for and handling client connections (e.g., catching new connections, terminating connections); Managing connected clients (e.g., retrieving files, showing the screen, killing processes); and. 1 It comes with built-in keylogging, image capturing, and webcam recording capabilities. Quasar users can specify which subdirectory within the base directory to place the client executable (as shown in figure 3). Quasar allows the user to gather host system information. Quasar users interact with the server and, in turn, its clients, through the GUI. It is likely that the Quasar TCP payload server packet will originate from TCP port 80 or 443 to traverse network firewalls and attempt to blend in with normal web browsing traffic. Quasar-0.8.0-Miniconda-x86_64.exe- aninstaller that can be used without administrative privileges (64 bit). Quasar Burst is responsible for searching torrents on several websites so they can be played by Quasar on Kodi.Usually, it is automatically along with Quasar but sometimes the installation process might fail. It is possible to see this User-Agent string used legitimately; however, organizations with information technology baselines should know if this User-Agent string legitimately exists in their network environment. If the client process has administrator privileges, the client will generate a scheduled task via schtasks. The User-Agent string remains consistent across all attempts. If the Window’s User Account Control (UAC) is configured, this method generates a UAC pop-up window on the target host, which asks the target host user to confirm the process of running the command prompt as the administrator. Mozilla/5.0 (Windows NT … Quasar virus removal guide What is Quasar? Quasar’s client builder limits the base directories in which the client may be placed. Table 1: Quasar client builder feature options and attributes. The entropy of AES ciphertext makes it impossible to write a pattern to detect this content. For this report, the National Cybersecurity and Communications Integration Center (NCCIC), part of CISA, analyzed Quasar version 1.3.0.0, which was released on September 28, 2016, and is the latest stable version available on GitHub. Features of Quasar RAT Windows Remote Administration Tool The main features […] The server component is configured with these values at compile time. When reviewing alerts NCCIC recommends looking for packets with a TTL between 65 and 128. Client Network Traffic. To escalate the client’s running privileges, Quasar attempts to launch a command prompt (cmd.exe) as an administrator. The Quasar user can direct the target host to visit a URL and retrieve the content. As part of the client connection setup, the client attempts to discover its geolocation—including its Wide Area Network (WAN) IP address—by sending an HTTP GET request to the Uniform Resource Locator (URL) ip-api[. Starred items (*) require administrator privileges, Makes a customizable subdirectory within the base installation path, The name of the client file. Note: Quasar does not contain software vulnerability exploits. The NCSC has stated that within the UK, APT10 has principally used the remote access trojan (RAT) Quasar RAT to steal data. There both are legitimate and illegal RATs. Immediately when the File Manager window is opened by the attacker, the Quasar server sends two commands to the RAT: GetDrives and listDirectory (to populate the list of the victim’s files in the RAT Server GUI). The User-Agent strings listed in this section are set by the server component when the client file is built. This information can be used to identify potential Quasar activity on a network. 0: 14: 8 hours ago. Mac OS X 10.9.3 and Safari 7 are not only dated, but also do not match the OS on which Quasar operates (i.e., Windows). Login to no-ip, and register a new host HERE: https://www.no-ip.com/members/dns/host.php. Quasar uses the first 4 bytes of the TCP payload to track the payload’s total size in little-endian format. AbdouDzGamer. Threat actors must leverage other tools or methods to gain access to a target host before they can use Quasar. Client execution is invisible to the target host user and does not generate any visible windows or notifications on the target host, except in cases where the client becomes unresponsive. Once running on a target host, the client  process is visible to the target host user via Windows Task Manager or a similar process management program. The elevated command prompt then relaunches the client. The Quasar user initiates client interactions by right-clicking an individual client row, which opens a pop-up menu with available commands. Open-source reports state that some APT actors have adapted Quasar and created modified minor (1.3.4.0) and major (2.0.0.0 and 2.0.0.1) versions. CISA is part of the Department of Homeland Security, Original release date: December 18, 2018 | Last, alert tcp $EXTERNAL_NET :1024 -> $HOME_NET any (msg:"Non-Std TCP Server Traffic contains '|40 00 00 00|' (Quasar RAT Initial Packet)"; sid:10000; rev:1; flow:established,from_server; dsize:68; content:"|40 00 00 00|"; depth:4; fast_pattern;), alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"HTTP Client Header contains 'Host|3a 20|ip-api com', URI '/json/' (Quasar RAT)"; sid:10002; rev:1; flow:established,to_server; content:"Host|3a 20|ip-api|2e|com|0d 0a|"; http_header; fast_pattern:only; content:"User-Agent|3a 20|Mozilla/5.0 (Windows NT 6.3|3b| rv|3a|48.0) Gecko/20100101 Firefox/48.0|0d 0a|"; http_header; content:"/json/"; http_uri; depth:6; urilen:6,norm; priority:2;), alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"HTTP Client Header contains 'User-Agent|3a 20|Mozilla/5.0 (Macintosh|3b| Intel Mac OS X 10_9_3) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/7046A194A', TTL 65-128 (Quasar RAT)"; sid:10001; rev:1; flow:established,to_server; content:"User-Agent|3a 20|Mozilla/5.0 (Macintosh|3b| Intel Mac OS X 10_9_3) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/7046A194A|0d 0a|"; http_header; fast_pattern:only; priority:2;), FireEye blog on new tools used by an APT group, Palo Alto Networks Unit 42 blog on Quasar, Represents the name for the client instance. Providing high stability and an easy-to-use user interface, Quasar is the perfect remote administration solution for you. (Quasar’s author has stated [via GitHub] that they would like to update Quasar to use Transport Layer Security for C2 encryption in the future.). NCCIC recommends applying this Snort signature to a network sensor located on an organization’s perimeter to limit the false positives generated by internal organization traffic. Unpack the installation package. The Quasar tool allows users to remotely control other computers over a network. NCCIC observed this packet as the first packet after the TCP handshake. This Analysis Report provides information on Quasar’s functions and features, along with recommendations for preventing and mitigating Quasar activity. Control remotely your computers, anywhere in the world. An official website of the United States government Here's how you know. The Quasar user can also set metadata to be embedded in the executable, such as the author, organization, copyright, year, and version. Subtracting the tracking bytes (4 bytes) from the total TCP payload (68 bytes) results in an actual payload size of 64 bytes. Quasar allows the user to gather host system information. This value is displayed in the connection table (see figure 1) of the Quasar server GUI once the client connects, QSR_MUTEX_[18 character alphanumeric upper and lowercase string], Sets the file mutual exclusion object (mutex) to prevent the same host being infected multiple times, Sets the server IP for the client connection, Sets the domain for the client connection, Sets the Transmission Control Protocol (TCP) port callback to “on”, Sets the password for Advanced Encryption Standard (AES) encryption, Sets how often the client will attempt to callback if they are not connected, Sets the default for whether or not the client will install on a host, The location where the client file will be installed on a host. Quasar client instances are built by the server component. Once all packages are installed the project can be compiled as usual by clicking Build at the top or by pressing F6. The strings can only be changed by altering the User-Agent string in the server source code. True positive alerts will likely have a 4-byte tracking sequence equal to the size of the TCP payload minus 4 bytes, with what appears to be ciphertext in the remaining payload. Therefore, NCCIC cannot definitively say whether the detection and mitigation recommendations provided in this report will work effectively against APT actor-modified versions of Quasar. Specifically, the first 4 bytes can identify the first packet sent from the server to the client following the TCP handshake. Open the project in Visual Studio and click build, or use one of the batch files included in the root directory. Figure 1 shows the Quasar server component GUI. 3. KitPloit - PenTest & Hacking Tools. The value name is then configured in the client builder, and the client adds its current path as the startup program. This report does not reflect any changes Quasar’s author has made to the tool’s source code since the release of v1.3.0.0. The following Snort signature can be used to detect unmodified Quasar v1.3.0.0; however, it is unknown if this signature can be used to detect modified versions. The usage ranges from user support through day-to-day administrative work to employee monitoring. Quasar is an open-source tool designed for Microsoft Windows operating systems and is publicly available on GitHub. This User-Agent string would likely stand out as unique in a corporate network environment, and its presence could be a high-confidence indication of Quasar activity. Arguments = "/k START \"\" \"" + ClientData.CurrentPath + "\" & EXIT", Figure 5: Source code from Quasar/Client/Core/Commands/SystemHandler.cs. Quasar uses a TCP payload of 68 bytes at the beginning of each of its sessions. Network defenders can detect Quasar activity by monitoring network traffic for its unique pattern, the registry key it edits for persistence, mutexes for strings that follow the default Quasar pattern, and the directories where Quasar installs itself. Quasar is an evolution of an older malware called xRAT and some of its samples can carry out as much as 16 malicious actions. Quasar users can also direct the client to access websites. Use the button Builder at the top of the Quasar application to start the client configuration. It is an important thing and Quasar itself downloads it during the installation of the add-on. Over the course of its lifetime, the malware has been updated several times, improving its overall functionality. The server component builds client executables that the Quasar user can run on target hosts. It aims to provide high stability and an easy-to-use user interface and is a free, open source tool. As part of the client connection setup, the client attempts to discover its geolocation—including its Wide Area Network (WAN) IP address—by sending an HTTP GET request to the Uniform Resource Locator (URL) ip-api[. For older systems please use Quasar version 1.3.0; Compiling. To achieve persistence, Quasar uses two methods: scheduled tasks and registry keys. Offers Geolocation Information Gathering Through Social Networking Platforms, Phpvuln - Audit Tool To Find Common Vulnerabilities In PHP Source Code, Linux-Chrome-Recon - An Information Gathering Tool Used To Enumerate All Possible Data About An User From Google-Chrome Browser From Any Linux Distribution, Cloudlist - A Tool For Listing Assets From Multiple Cloud Providers, Builds the application using the debug configuration (for testing), Builds the application using the release configuration (for publishing). Quasar was first released in July 2014 as “xRAT 2.0.” In August 2015, xRAT was renamed “Quasar” and released as v1.0.0.0. Check for Quasar addon update by right clicking on Quasar Kodi addon > Select Information > At the bottom, click on Update. Figure 1: Quasar screenshot – example of a Quasar server with a connected client. This packet is used to initiate the server/client authentication process. The last version of the malware which was dev… Quasar users can also specify the name of the executable. Once it is distributed to a target host, the client needs to be executed before it can call back to the server. Quasar’s distinctive 68-byte TCP payload presents the best opportunity for network defenders to identify Quasar activity. Open the project Quasar.sln in Visual Studio 2019+ with installed .NET desktop development features and restore the NuGET packages. Due to its P2P nature, Quasar uses both download and upload bandwidth while you are watching a video. The client builder hardcodes a Quasar user-chosen, pre-shared key to be used in command and control (C2) communications. This project is currently not maintained. Quasar is a publically available, open-source RAT for Microsoft Windows operating systems (OSs) written in the C# programming language. if (WindowsAccountHelper.GetAccountType() == "Admin"), ProcessStartInfo startInfo = new ProcessStartInfo("schtasks"). Based on multiple client builds, each with different configurations, the client size is consistently 349KB. Features TCP network stream (IPv4 & IPv6 support) Fast network serialization (NetSerializer) Compressed (QuickLZ) & Encrypted (AES-128) communication Multi-Threaded … Quasar server does not even verify that a file was requested from the victim. We recently updated our anonymous product survey; we'd welcome your feedback. This file must be, A checkbox that, if checked, will add the Quasar client as an AutoRun via Registry Key or Scheduled Task, Quasar Open-Source Remote Administration Tool. 5: 83: 14 hours ago. This is intended to be used by the blue... Satellite is an web payload hosting service which filters requests to ensure the correct target is getting a payload. Last Post: AbdouDzGamer : UPLOAD.SEXY ~ FREE DIRECT DOWNLOAD/UPLOAD SERVICES ~ HTTPS ~ NO LOGS ~ .EXE .DLL ~~ Sexy Name [Pages: 1 2] 15: 335: 9 hours ago. A Free Download World. Network defenders may want to further limit this Snort signature to only TCP ports 80 or 443. This Snort signature alerts on a client-generated hidden HTTP request. Program Files (requires administrator privileges). Download the Quasar installation package: Download for ARM64 Download for ARM32. Requests that are marked as invisible to the host user are sent with User-Agent string: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/7046A194A. The use of Mac OS X as the operating system is interesting because Quasar can only be run on Windows. Each client’s entry is listed individually and includes the client’s Internet Protocol (IP) address, username, Quasar client version, connection status, user status, country, OS, and account type. The file is completely clean, if it is reported as a virus it is normal because it … Contribute to quasar/Quasar development by creating an account on GitHub. That registry value is added to the following key: HKCU\Software\Microsoft\Windows\CurrentVersion\Run. Quasar allows the tool user to escalate the client’s running privileges, as seen in the source code shown in figure 5. This User-Agent string mimics an Apple Safari 7.0.3 browser running on Mac OS X 10.9.3. This Snort signature alerts on the WAN IP lookup initiated by the Quasar client. When reviewing alerts generated by this Snort signature, network defenders should look for server-to-client TCP PSH/ACK packets following the alert packet. The client inherits the parent process’ now-elevated privileges. Quasar is a legitimate tool, however, cyber criminals often use these tools for malicious purposes. Quasar RAT is an open-source RAT coded in C# that has been utilised by everyone from script kiddies to full APT groups. Quasar is a video addon for Kodi that uses BitTorrent, a peer-to-peer file-sharing protocol, to streams movies and TV shows in great video quality. For the hostname, put whatever you want (may depend on the RAT/DDOSER/ you’re using, so make sure you know), and the IP address should auto-fill itself. "Software\\Microsoft\\Windows\\CurrentVersion\\Run", Settings.STARTUPKEY, ClientData.CurrentPath, Figure 4: Source code from Quasar/Client/Core/Installation/Startup.cs. Quasar is a fast and light-weight remote administration tool coded in C#. This field is limited to the options listed. The package includes python 3.6.10,Orange 3.25.0, Orange-Spectroscopy 0.5.2, numpy 1.16.6,scipy 1.2.1, scikit-learn 0.22.1. The schedule task runs after the host user logs on, executes with the highest run level (i.e., the highest level of privilege), and suppresses any errors related to creating the task. This signature matches on a server-to-client packet with a TCP payload length of 68 bytes and the first 4 bytes matching the size tracking sequence. While the tool can be used for legitimate purposes (e.g., an organization’s helpdesk technician remotely accessing an employee’s laptop), the … The first version of Microsoft Solitaire was released along with Windows 3.0 back in 1990. Originally, the RAT was known as … ]com/json/ with User-Agent string:. tankboy2431. Quasar Burst enables Quasar Kodi to search torrents. Quasar encrypts communications using the AES algorithm. The server must be configured to listen on the callback port and use the pre-shared key. Software programs of this type are known as remote access tools (RATs). ]org, respectively. Arguments = "/create /tn \"" + Settings.STARTUPKEY + "\" /sc ONLOGON /tr \"" + ClientData.CurrentPath + "\" /rl HIGHEST /f". Quasar is a publically available, open-source RAT for Microsoft Windows operating systems (OSs) written in the C# programming language. QuasarRAT Golden Edition Hi guys, I'll post the 1.4.1.0 version of QuasarRAT. Requests that are visible to the host user use the User Agent string from the Quasar user’s browser. The client builder feature allows the Quasar user to select from different options and attributes (see table 1). The second package is the heart of it and it gets installed into every Quasar project folder. The first one is optional and only allows you to create a project folder and globally run Quasar commands. The User-Agent string, Hypertext Transfer Protocol (HTTP) header host, and HTTP header URI values are set by the server component when the client is built. Quasar is a fast and light-weight Windows remote administration tool coded in C#. This product is provided subject to this Notification and this Privacy & Use policy. return RegistryKeyHelper.AddRegistryKeyValue(RegistryHive.CurrentUser. Quasar is a fast and light-weight remote administration tool coded in C#. Quasar requires a Microsoft .NET Framework 4.0 (or higher) Client Profile. mkdir $HOME/quasar cd quasar tar -xJf $HOME/Downloads/QuasarLatest_ARM32.tar.xz (or) tar -xJf $HOME/Downloads/QuasarLatest_ARM64.tar.xz. Providing high stability and an easy-to-use user interface,… Its capabilities include capturing screenshots, recording webcam, reversing proxy, editing registry, spying on the user’s actions, keylogging and stealing passwords. While the tool can be used for legitimate purposes (e.g., an organization’s helpdesk technician remotely accessing an employee’s laptop), the Cybersecurity and Infrastructure Security Agency (CISA), is aware of APT actors using Quasar for cybercrime and cyber espionage campaigns. Quasar is authored by GitHub user MaxXor and publicly hosted as a GitHub repository. Network defenders can create and implement additional signatures to detect differing TCP payload sizes and the packet’s respective size tracking sequences. After the TCP handshake is completed, all traffic between the server and client is encrypted. Providing high stability and an easy-to-use user interface, Quasar is the perfect remote administration solution for you. Quasar is a fast and light-weight remote administration tool coded in C#. Fast network serialization (NetSerializer), Compressed (QuickLZ) & Encrypted (AES-128) communication, Computer Commands (Restart, Shutdown, Standby). If the process does not have administrator privileges, the scheduled task will only add a registry value. Both the client executable and the subdirectory can be hidden from the target host user during installation by a Windows application programming interface call that sets one of the file’s attributes to “hidden.” The “hidden” setting only hides files from the target host user’s view in Windows File Explorer. ]net and api[.]ipify[. As shown in figure 2, the first 4 bytes of the TCP payload contain 0x40000000 or 64 decimal in hexadecimal notation. Read More. Remote Administration Tool for Windows. This size-tracking pattern is distinctive to Quasar network traffic. Quasar achieves persistence by executing on startup, as seen in the source code shown in figure 4. The scheduled task is generated using the task name created in the client builder. The Quasar client and server will run on the following OSs (32- and 64-bit): The Quasar server component is responsible for. if (WindowsAccountHelper.GetAccountType() != "Admin"), ProcessStartInfo processStartInfo = new ProcessStartInfo. Quasar CLI is made up of two packages: @quasar/cli and @quasar/app. ]com/json/ with User-Agent string: Mozilla/5.0 (Windows NT 6.3; rv:48.0) Gecko/20100101 Firefox/48.0. The three base directories in which the Quasar client builder can place itself are, Figure 3: Quasar sceenshot – client installation settings. Threat actors, including advanced persistent threat (APT) actors, can use Quasar as a remote access trojan (RAT) to penetrate and control Select Install from Zip File and install the Quasar zip file you downloaded above. After configuring the client for your needs, click the Build button and choose a location to save the built client. This can also be a ... QuasarRAT - Remote Administration Tool for Windows, FaradaySEC | Multiuser Pentest Environment, Creepy - A Geolocation OSINT Tool. Depending on your location, you might need a VPN to protect your privacy while using torrents. Quasar is authored by GitHub user MaxXor and publicly hosted as a GitHub repository. 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United States government HERE 's how you know built by the server be... The base directories in which the client may be placed start the client following the TCP handshake root! 3.0 back in 1990 quasar rat setup tools ( RATs ) What is Quasar,. A response from this lookup, the client needs to be executed before can! Access websites though ; you ’ ll see why soon a new host HERE: https: //www.no-ip.com/members/dns/host.php and allows. Studio 2019+ with installed.NET desktop development features and restore the NuGET packages shown figure! Component builds client executables that the Quasar user to remotely access many clients aims to provide high and. Schtasks '' ), ProcessStartInfo ProcessStartInfo = new ProcessStartInfo account on GitHub 32- and 64-bit ) the! The United States government HERE 's how you know binary builds as malicious launch a command (! Is provided subject to this Notification and this privacy & use policy the add-on fast and light-weight remote administration for. Functions and features, along with recommendations for preventing and mitigating Quasar activity the! Please use Quasar version 1.3.0 ; Compiling have administrator privileges, the client file is.... Quasar allows the user to remotely access many clients 32- and 64-bit ): the Quasar with. Course of its lifetime, the client inherits the parent process ’ now-elevated privileges which within. Psh/Ack packets following the TCP payload presents the best android RAT in your?! Contribute to quasar/Quasar development by creating an account on GitHub GitHub repository and give Quasar a folder your... On the callback port and use the user to remotely control other computers a. Mimics Windows 8.1 running Firefox 48, both of which are considerably dated server is responsible for creating client and...