Sigma rule: Hide Schedule Task Via Index Value Tamper

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-adabdf6d9525, updated 2023-08-17T00:00:00.000Z.

Rule

Title
Hide Schedule Task Via Index Value Tamper
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-08-26
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_hide_scheduled_task_via_index_tamper.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when the "index" value of a scheduled task is modified from the registry
Which effectively hides it from any tooling such as "schtasks /query" (Read the referenced link for more information about the effects of this technique)

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains|all:
        - '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\'
        - 'Index'
    Details: DWORD (0x00000000)
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.defense-impairment
  • attack.t1685

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_hide_scheduled_task_via_index_tamper.yml

Sources and licences

  • SigmaHQ

    "Hide Schedule Task Via Index Value Tamper" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_hide_scheduled_task_via_index_tamper.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Hide Schedule Task Via Index Value Tamper",
entity page, dataset version ref-adabdf6d9525, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5b16df71-8615-4f7f-ac9b-6c43c0509e61 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5b16df71-8615-4f7f-ac9b-6c43c0509e61, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.