For example, on macOS systems the screensharingd process may be related to VNC connection activity. Monitor for newly executed processes that may use Valid Accounts to remotely control machines using Virtual Network Computing (VNC). Other factors, such as access patterns and activity that occurs after a remote login, may indicate suspicious or malicious behavior using VNC. Use of VNC may be legitimate depending on the environment and how it’s used. Monitor for newly constructed network connections that may use Valid Accounts to remotely control machines using Virtual Network Computing (VNC). For example, on macOS systems log show -predicate 'process = "screensharingd" and eventMessage contains "Authentication:"' can be used to review incoming VNC connection attempts for suspicious activity. Note: Please remember to use your own hostname, not the example we have provided here. Monitor for user accounts logged into systems that may use Valid Accounts to remotely control machines using Virtual Network Computing (VNC). Open the Viewer software which should be in Start > All Programs > Real VNC > VNC Viewer A connection box will pop up asking you the name of the server you wish to connect to input the name of a host you have created in your No-IP account, then click OK. A VNC server must be manually installed by the user or adversary. Restrict software installation to user groups that require it. Filtering or blocking these ports will inhibit VNC traffic utilizing default ports. VNC defaults to TCP ports 5900 for the server, 5800 for browser access, and 5500 for a viewer in listening mode. Uninstall any VNC server software where not required. Inventory workstations for unauthorized VNC server software. ZxShell supports functionality for VNC sessions. WarzoneRAT has the ability of performing remote desktop access via a VNC console. TrickBot has used a VNC module to monitor the victim and collect information to pivot to valuable systems on the network Gamaredon Group has used VNC tools, including UltraVNC, to remotely interact with compromised hosts. įox Kitten has installed TightVNC server and client on compromised servers and endpoints for lateral movement. įIN7 has used TightVNC to control compromised hosts. Ĭarberp can start a remote VNC session by downloading a new plugin. Specific VNC libraries/implementations have also been susceptible to brute force attacks and memory usage exploitation. An adversary could use VNC to remotely control and monitor a system to collect data and information to pivot to other systems within the network. Īdversaries may abuse VNC to perform malicious actions as the logged-on user such as opening documents, downloading files, and running arbitrary commands. By default, VNC uses the system's authentication, but it can be configured to use credentials specific to VNC. VNC differs from Remote Desktop Protocol as VNC is screen-sharing software rather than resource-sharing software. VNC is a platform-independent desktop sharing system that uses the RFB ("remote framebuffer") protocol to enable users to remotely control another computer’s display by relaying the screen, mouse, and keyboard inputs over the network. Adversaries may use Valid Accounts to remotely control machines using Virtual Network Computing (VNC).
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