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Detectionmediumtest

Removal Of SD Value to Hide Schedule Task - Registry

Remove SD (Security Descriptor) value in \Schedule\TaskCache\Tree registry hive to hide schedule task. This technique is used by Tarrask malware

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Sittikorn SCreated Fri Apr 15Updated Sat Oct 25acd74772-5f88-45c7-956b-6a7b36c294d2windows
Log Source
WindowsRegistry Delete
ProductWindows← raw: windows
CategoryRegistry Delete← raw: registry_delete
Detection Logic
Detection Logic1 selector
detection:
    selection:
        TargetObject|contains|all:
            - '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\'
            - 'SD'
    condition: selection
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
microsoft.com
Testing & Validation

Regression Tests

by SigmaHQ Team
Positive Detection Test1 matchevtx

Microsoft-Windows-Sysmon

EVTX JSON
MITRE ATT&CK
Related Rules
SimilarDetectionmedium

Removal Of Index Value to Hide Schedule Task - Registry

Detects when the "index" value of a scheduled task is removed or deleted from the registry. Which effectively hides it from any tooling such as "schtasks /query"

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
acd74772-5f88-45c7-956b-6a7b36c294d2
Status
test
Level
medium
Type
Detection
Created
Fri Apr 15
Modified
Sat Oct 25
Author
Sittikorn S
Path
rules/windows/registry/registry_delete/registry_delete_schtasks_hide_task_via_sd_value_removal.yml
Raw Tags
attack.defense-evasionattack.t1562
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