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https://github.com/splunk/security_content
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pyth0n1c
69 lines
3.3 KiB
YAML
69 lines
3.3 KiB
YAML
name: Windows PowerShell Get CIMInstance Remote Computer
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id: d8c972eb-ed84-431a-8869-ca4bd83257d1
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version: 4
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date: '2024-11-13'
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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: The following analytic detects the use of the Get-CimInstance cmdlet
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with the -ComputerName parameter, indicating an attempt to retrieve information
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from a remote computer. It leverages PowerShell Script Block Logging to identify
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this specific command execution. This activity is significant as it may indicate
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unauthorized remote access or information gathering by an attacker. If confirmed
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malicious, this could allow the attacker to collect sensitive data from remote systems,
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potentially leading to further exploitation or lateral movement within the network.
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search: '`powershell` EventCode=4104 ScriptBlockText="*get-ciminstance*" AND ScriptBlockText="*computername*" |
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stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer user_id | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `windows_powershell_get_ciminstance_remote_computer_filter`'
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how_to_implement: 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://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: This is meant to be a low risk RBA anomaly analytic or to be
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used for hunting. Enable this with a low risk score and let it generate risk in
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the risk index.
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references:
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- https://learn.microsoft.com/en-us/powershell/module/cimcmdlets/get-ciminstance?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: '| 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: A PowerShell Cmdlet Get-CIMInstnace was ran on $Computer$, attempting to
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connect to a remote host.
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risk_objects:
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- field: Computer
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type: system
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score: 15
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threat_objects: []
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tags:
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analytic_story:
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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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- 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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/atomic_red_team/get_ciminstance_windows-powershell.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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