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https://github.com/splunk/security_content
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ljstella
76 lines
3.6 KiB
YAML
76 lines
3.6 KiB
YAML
name: PowerShell Invoke CIMMethod CIMSession
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id: 651ee958-a433-471c-b264-39725b788b83
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version: 7
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date: '2025-06-24'
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author: Michael Haag, Splunk
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type: Anomaly
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status: production
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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 the creation of a New-CIMSession cmdlet
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followed by the use of the Invoke-CIMMethod cmdlet within PowerShell. It leverages
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PowerShell Script Block Logging to identify these specific cmdlets in the ScriptBlockText
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field. This activity is significant because it mirrors the behavior of the Invoke-WMIMethod
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cmdlet, often used for remote code execution via NTLMv2 pass-the-hash authentication.
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If confirmed malicious, this could allow an attacker to execute commands remotely,
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potentially leading to unauthorized access and control over targeted systems.
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search:
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'`powershell` EventCode=4104 ScriptBlockText IN ("*invoke-CIMMethod*", "*New-CimSession*")
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signature signature_id user_id vendor_product EventID Guid Opcode Name Path ProcessID
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ScriptBlockId ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `powershell_invoke_cimmethod_cimsession_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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False positives may be present based on third-party applications
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or administrators using CIM. It is recommended to apply appropriate filters as needed
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to minimize the number of false positives.
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references:
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- https://learn.microsoft.com/en-us/powershell/module/cimcmdlets/invoke-cimmethod?view=powershell-7.3
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drilldown_searches:
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- name: View the detection results for - "$Computer$"
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search: '%original_detection_search% | search Computer = "$Computer$"'
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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 - "$Computer$"
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search:
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'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$Computer$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `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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PowerShell was identified running a Invoke-CIMMethod Invoke-CIMSession
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on $dest$.
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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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threat_objects: []
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tags:
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analytic_story:
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- Malicious PowerShell
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- Active Directory Lateral Movement
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asset_type: Endpoint
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mitre_attack_id:
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- T1047
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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/T1047/atomic_red_team/4104-cimmethod-windows-powershell.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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