Suspicious Scheduled Task Write to System32 Tasks — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2021-11-16 / 2022-01-12.

{
  "product": "windows",
  "category": "file_event"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 82313978dcef20037a0f1e73de4567ef1033de014c6557dbb22f60e64407f1a9

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Suspicious Scheduled Task Write to System32 Tasks
id: 80e1f67a-4596-4351-98f5-a9c3efabac95
status: test
description: Detects the creation of tasks from processes executed from suspicious locations
references:
    - Internal Research
author: Florian Roth (Nextron Systems)
date: 2021-11-16
modified: 2022-01-12
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.t1053
logsource:
    product: windows
    category: file_event
detection:
    selection:
        TargetFilename|contains: '\Windows\System32\Tasks'
        Image|contains:
            - '\AppData\'
            - 'C:\PerfLogs'
            - '\Windows\System32\config\systemprofile'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• Internal Research (source note; no public URL supplied)