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Quasar Changelog

Quasar v1.4.1 [12.03.2023]

  • Added missing WOW64 subsystem autostart locations
  • Fixed file transfers of files larger than 2 GB
  • Fixed file transfers of empty files
  • Fixed browser credentials recovery
  • Fixed race condition on shutdown
  • Fixed IP Geolocation
  • Fixed opening remote shell sessions on non-system drives
  • Fixed incorrectly set file attributes on client installations
  • Fixed sorting of listview columns with numbers
  • Updated dependencies

Quasar v1.4.0 [05.06.2020]

  • Changed target framework to .NET Framework 4.5.2
  • Changed license to MIT
  • Changed message serializer to Protobuf
  • Changed versioning scheme to Semantic Versioning (
  • Added attended/unattended client modes
  • Added TLS 1.2 as transport encryption
  • Added UTC timestamps to log files
  • Added dependencies as NuGet packages
  • Updated dependencies
  • Updated message processing in client and server
  • Updated mouse and keyboard input to SendInput API
  • Fixed file transfer vulnerbilities (#623)
  • Lots of under the hood changes for an upcoming plugin system

Quasar v1.3.0.0 [28.09.2016]

  • Added Registry Editor
  • Added Remote Webcam
  • Added Windows DPI scaling support
  • Added IPv6 support
  • Added ability to elevate Client
  • Added full Unicode support
  • Added Remote TCP Connections Viewer
  • Added option to hide sub directory of installation path
  • Improved cryptography
  • Fixed XSS vulnerability in Keylogger Logs
  • Fixed Remote Messagebox having wrong icon
  • Fixed FileZilla Recovery base64 decoding
  • Fixed UPnP discovery freezing in some cases
  • Fixed IP Geolocation
  • Fixed Client loses Administrator privileges on restart
  • Some minor improvements

Quasar v1.2.0.0 [12.10.2015]

  • Added Client restart on unhandled exceptions
  • Added additional settings to Keylogger (set/hide log-directory)
  • Added encrypted Keylogger logs
  • Improved Client Builder
  • Improved System Information
  • Improved File Manager behaviour when loading directories with many files
  • Improved Remote Shell (scrolls now correctly to the bottom when new text received)
  • Improved compatibility with many connected clients (1k+)
  • Improved AES encryption/decryption speed (if available, makes use of hardware accelerated AES)
  • Fixed Client not setting file attribute correctly on startup
  • Fixed Remote Desktop lagging with mouse input and maximized window
  • Some minor improvements

Quasar v1.1.0.0 [30.08.2015]

  • Changed Target Framework to .NET Framework 4.0 Client Profile
  • Added deletion of ZoneIdentifier file when installing
  • Improved Client installation error handling
  • Improved Client HardwareID generation
  • Improved Client-Server handshake
  • Support detection of multiple AVs, Firewalls, GPUs, CPUs
  • Fixed Builder Profile not saving correctly Installation Subfolder
  • Fixed Builder not validating input correctly
  • Fixed Builder creating Client with empty list of hosts
  • Fixed Settings Password not hashed when pressing 'Start listening'
  • Fixed Reverse Proxy using always wrong port
  • Fixed Server throwing NullReferenceException when closing and no Clients connected
  • Fixed Client reporting wrong uptime on systems with uptime longer than 49.7 days
  • Fixed Client installation path empty on Windows XP 32-bit in some scenarios
  • Fixed Client installation to system directory failing on 64-bit OS
  • Fixed Client uninstallation not working when file is marked as read-only
  • Fixed Client crashing after update on first start in some scenarios
  • Fixed Client crashing when list of hosts is empty (Client exits now)
  • Fixed Client not reconnecting when Server uses different password
  • Fixed Client registry access
  • Removed Statistics window, will be remade in a later version

Quasar v1.0.0.0 [22.08.2015]

  • xRAT is now Quasar
  • Added Password Recovery (Common Browsers and FTP Clients)
  • Added Server compatiblity with Mono (Server now runs on Linux with Mono installed)
    • Client Builder works also on Linux/Mono
  • Added ability to upload batch files
  • Added Client support for multiple hosts
  • Added maximum simultaneous file downloads/uploads (current max: 2)
  • Fixed Remote Shell redirecting of standard output not working after redirecting error output
  • Fixed Remote Shell not displaying unicode characters correctly
  • Fixed Remote Desktop crash when changing screen resolution
  • Fixed File Manager would refresh directory when double-clicking files
  • Improved support for Windows 8 and above
  • Improved Remote Desktop (Speed, Full Mouse and Keyboard support)
  • Improved File Manager (Show name of drive, current path, upload files)
  • Improved UPnP support
  • Improved Geo IP support
  • Improved Builder UI
  • Switched from Protobuff to NetSerializer
  • Lots of under the hood changes for stability and performance