Disable Important Scheduled Task

calendar Aug 26, 2024 · attack.impact attack.t1489  ·
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Detects when adversaries stop services or processes by disabling their respective scheduled tasks in order to conduct data destructive activities

Sigma rule (View on GitHub)

 1title: Disable Important Scheduled Task
 2id: 9ac94dc8-9042-493c-ba45-3b5e7c86b980
 3related:
 4    - id: 7595ba94-cf3b-4471-aa03-4f6baa9e5fad # Security-Audting Eventlog
 5      type: similar
 6status: test
 7description: Detects when adversaries stop services or processes by disabling their respective scheduled tasks in order to conduct data destructive activities
 8references:
 9    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1490/T1490.md#atomic-test-8---windows---disable-the-sr-scheduled-task
10    - https://twitter.com/MichalKoczwara/status/1553634816016498688
11    - https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
12author: frack113, Nasreddine Bencherchali (Nextron Systems), X__Junior
13date: 2021-12-26
14modified: 2024-08-25
15tags:
16    - attack.impact
17    - attack.t1489
18logsource:
19    category: process_creation
20    product: windows
21detection:
22    selection:
23        Image|endswith: '\schtasks.exe'
24        CommandLine|contains|all:
25            - '/Change'
26            - '/TN'
27            - '/disable'
28        CommandLine|contains:
29            # Add more important tasks
30            - '\Windows\BitLocker'
31            - '\Windows\ExploitGuard'
32            - '\Windows\ExploitGuard\ExploitGuard MDM policy Refresh'
33            - '\Windows\SystemRestore\SR'
34            - '\Windows\UpdateOrchestrator\'
35            - '\Windows\Windows Defender\'
36            - '\Windows\WindowsBackup\'
37            - '\Windows\WindowsUpdate\'
38    condition: selection
39falsepositives:
40    - Unknown
41level: high

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