|Data Sources||API monitoring, Process monitoring, File monitoring|
Adversaries may attempt to perform screen capture of devices in the control system environment. Screenshots may be taken of workstations, HMIs, or other devices that display environment-relevant process, device, reporting, alarm, or related data. These device displays may reveal information regarding the ICS process, layout, control, and related schematics. In particular, an HMI can provide a lot of important industrial process information.1 Analysis of screen captures may provide the adversary with an understanding of intended operations and interactions between critical devices.
- ALLANITE has been identified to collect and distribute screenshots of ICS systems such as HMIs.21
- APT33 utilize backdoors capable of capturing screenshots once installed on a system.34
- Dragonfly has been reported to take screenshots of the GUI for ICS equipment, such as HMIs.1
- Mitigation Limited or Not Effective - Preventing screen capture on a device may require disabling various system calls supported by the operating systems (e.g., Microsoft WindowsGraphicsCaputer APIs), however, these may be needed for other critical applications.