huntrule

Windows Registry: Delete SD Value Under Schedule\TaskCache\Tree to Impair Scheduled Task Visibility

Detects deletion of the SD registry value under Schedule\TaskCache\Tree, which can impair scheduled task visibility.

FreeReviewedSigma · Medium · v1
Product
windows
Category
registry_delete
Author
Sittikorn S (SigmaHQ), DRL 1.1
Published
2022-04-15
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags registry deletions that remove the SD value under the Schedule\TaskCache\Tree path in Windows. Attackers can use this defense-impairment behavior to hide or disrupt scheduled task visibility by altering security descriptor-related data. It relies on telemetry indicating registry value deletion events with a target object path containing the specified Schedule\TaskCache\Tree key and including an SD value.

Reporting behind it

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Malicious AuKill EDR Killer Kernel Driver Load via Process Explorer Driver (via image_load)
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Windows Registry: Delete SD Value Under Schedule\TaskCache\Tree to Impair Scheduled Task Visibility
Pivot detection · T1685 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.