Screensaver

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Screensaver
Technique
ID T1180
Tactic Persistence
Platform Windows
Permissions Required User
Data Sources Process Monitoring, Process command-line parameters, Windows Registry, File monitoring
Contributors Bartosz Jerzman

Screensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension.1 The Windows screensaver application scrnsave.exe is located in C:\Windows\System32\ along with screensavers included with base Windows installations. The following screensaver settings are stored in the Registry (HKCU\Control Panel\Desktop\) and could be manipulated to achieve persistence:

  • SCRNSAVE.exe - set to malicious PE path
  • ScreenSaveActive - set to '1' to enable the screensaver
  • ScreenSaverIsSecure - set to '0' to not require a password to unlock
  • ScreenSaverTimeout - sets user inactivity timeout before screensaver is executed

Adversaries can use screensaver settings to maintain persistence by setting the screensaver to run malware after a certain timeframe of user inactivity.2

Examples

  • Gazer can establish persistence through the system screensaver by configuring it to execute the malware.2

Mitigation

Block .scr files from being executed from non-standard locations. Set Group Policy to force users to have a dedicated screensaver where local changes should not override the settings to prevent changes. Use Group Policy to disable screensavers if they are unnecessary.3

Detection

Monitor process execution and command-line parameters of .scr files. Monitor changes to screensaver configuration changes in the Registry that may not correlate with typical user behavior.

Tools such as Sysinternals Autoruns can be used to detect changes to the screensaver binary path in the Registry. Suspicious paths and PE files may indicate outliers among legitimate screensavers in a network and should be investigated.