Suspicious Bypass UAC Via SilentCleanup Task (via registry_set)
This rule detects the setting of the environement variable "windir" to a non default value. Attackers frequently misuse this variable to trigger a UAC bypass via the "SilentCleanup" task. The SilentCleanup task located in %windir%\system32\cleanmgr.exe is an auto-elevated task that can be misused to elevate any file with administrator privileges without prompting UAC.
SigmahighWindowsv1
Full detection rule
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Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.