mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Michael Haag
88 lines
4.1 KiB
YAML
88 lines
4.1 KiB
YAML
name: Windows PowerShell ScheduleTask
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id: ddf82fcb-e9ee-40e3-8712-a50b5bf323fc
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version: 9
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date: '2025-07-29'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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data_source:
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- Powershell Script Block Logging 4104
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description:
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The following analytic detects potential malicious activities involving
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PowerShell's task scheduling cmdlets. It leverages PowerShell Script Block Logging
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(EventCode 4104) to identify unusual or suspicious use of cmdlets like 'New-ScheduledTask'
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and 'Set-ScheduledTask'. This activity is significant as attackers often use these
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cmdlets for persistence and remote execution of malicious code. If confirmed malicious,
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this could allow attackers to maintain access, deliver additional payloads, or execute
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ransomware, leading to data theft or other severe impacts. Immediate investigation
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and mitigation are crucial to prevent further compromise.
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search:
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'`powershell` EventCode=4104 ScriptBlockText IN ("*New-ScheduledTask*", "*New-ScheduledTaskAction*",
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"*New-ScheduledTaskSettingsSet*", "*New-ScheduledTaskTrigger*", "*Register-ClusteredScheduledTask*",
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"*Register-ScheduledTask*", "*Set-ClusteredScheduledTask*", "*Set-ScheduledTask*",
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"*Start-ScheduledTask*", "*Enable-ScheduledTask*") | fillnull | stats count min(_time)
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as firstTime max(_time) as lastTime by dest signature signature_id user_id vendor_product
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EventID Guid Opcode Name Path ProcessID ScriptBlockId ScriptBlockText | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `windows_powershell_scheduletask_filter`'
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how_to_implement:
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To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://help.splunk.com/en/security-offerings/splunk-user-behavior-analytics/get-data-in/5.4.1/add-other-data-to-splunk-uba/configure-powershell-logging-to-see-powershell-anomalies-in-splunk-uba.
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known_false_positives:
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Benign administrative tasks can also trigger alerts, necessitating
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a firm understanding of the typical system behavior and precise tuning of the analytic
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to reduce false positives.
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references:
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- https://learn.microsoft.com/en-us/powershell/module/scheduledtasks/?view=windowsserver2022-ps
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- https://thedfirreport.com/2023/06/12/a-truly-graceful-wipe-out/
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drilldown_searches:
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- name: View the detection results for - "$Computer$" and "$user_id$"
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search:
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'%original_detection_search% | search Computer = "$Computer$" user_id =
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"$user_id$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$Computer$" and "$user_id$"
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search:
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'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$Computer$",
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"$user_id$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message:
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The PowerShell cmdlets related to task creation, modification and start
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occurred on $dest$ by $user_id$.
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risk_objects:
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- field: dest
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type: system
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score: 25
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- field: user_id
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type: user
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score: 25
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threat_objects: []
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tags:
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analytic_story:
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- Scheduled Tasks
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- Scattered Spider
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asset_type: Endpoint
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atomic_guid:
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- af9fd58f-c4ac-4bf2-a9ba-224b71ff25fd
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mitre_attack_id:
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- T1053.005
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- T1059.001
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.005/atomic_red_team/pwsh_scheduledtask.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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