mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
64 lines
3.6 KiB
YAML
64 lines
3.6 KiB
YAML
name: Windows PowerShell Export Certificate
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id: 5e38ded4-c964-41f4-8cb6-4a1a53c6929f
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version: 12
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creation_date: '2023-02-03'
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modification_date: '2026-05-13'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects the use of the PowerShell Cmdlet `export-certificate` by leveraging Script Block Logging. This activity is significant as it may indicate an adversary attempting to exfiltrate certificates from the local Certificate Store on a Windows endpoint. Monitoring this behavior is crucial because stolen certificates can be used to impersonate users, decrypt sensitive data, or facilitate further attacks. If confirmed malicious, this activity could lead to unauthorized access to encrypted communications and sensitive information, posing a severe security risk.
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data_source:
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- Powershell Script Block Logging 4104
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search: |-
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`powershell` EventCode=4104 ScriptBlockText IN ("*export-certificate*")
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| rename Computer as dest
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY dest signature signature_id
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user_id vendor_product EventID
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Guid Opcode Name
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Path ProcessID ScriptBlockId
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ScriptBlockText
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `windows_powershell_export_certificate_filter`
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how_to_implement: To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here 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: It is possible administrators or scripts may run these commands, filtering may be required.
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references:
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- https://dev.to/iamthecarisma/managing-windows-pfx-certificates-through-powershell-3pj
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- https://learn.microsoft.com/en-us/powershell/module/pki/export-certificate?view=windowsserver2022-ps
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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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 - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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intermediate_findings:
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entities:
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- field: dest
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type: system
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score: 20
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message: A PowerShell Cmdlet related to exporting a Certificate was ran on $dest$, attempting to export a certificate.
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analytic_story:
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- Windows Certificate Services
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asset_type: Endpoint
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mitre_attack_id:
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- T1552.004
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- T1649
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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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category: endpoint
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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/T1649/atomic_red_team/4104_export_certificate.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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test_type: unit
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