Graphical User Interface
Where this stands
No Sigma rule can address this — the telemetry MITRE names has no Sigma logsource behind it.
Sigma has no logsource taxonomy for ICS. MITRE's telemetry here is operational historians and controller state, which no Sigma rule can address.
What the technique is
Adversaries may attempt to gain access to a machine via a Graphical User Interface (GUI) to enhance execution capabilities. Access to a GUI allows a user to interact with a computer in a more visual manner than a CLI. A GUI allows users to move a cursor and click on interface objects, with a mouse and keyboard as the main input devices, as opposed to just using the keyboard. If physical access is not an option, then access might be possible via protocols such as VNC on Linux-based and Unix-based operating systems, and RDP on Windows operating systems. An adversary can use this access to execute programs and applications on the target machine.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1904
Monitor for newly executed processes related to services specifically designed to accept remote graphical connections, such as RDP and VNC. Remote Services and Valid Accounts may be used to access a host’s GUI. Monitor executed commands and arguments related to services specifically designed to accept remote graphical connections, such as RDP and VNC. Remote Services and Valid Accounts may be used to access a host’s GUI. Monitor DLL file events, specifically creation of these binary files as well as the loading of DLLs into processes associated with remote graphical connections, such as RDP and VNC. Remote Services may be used to access a host’s GUI. […]
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.