mirror of
https://github.com/splunk/security_content
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pyth0n1c
71 lines
3.3 KiB
YAML
71 lines
3.3 KiB
YAML
name: Windows PowerShell Export Certificate
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id: 5e38ded4-c964-41f4-8cb6-4a1a53c6929f
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version: 5
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date: '2025-02-10'
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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`
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by leveraging Script Block Logging. This activity is significant as it may indicate
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an adversary attempting to exfiltrate certificates from the local Certificate Store
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on a Windows endpoint. Monitoring this behavior is crucial because stolen certificates
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can be used to impersonate users, decrypt sensitive data, or facilitate further
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attacks. If confirmed malicious, this activity could lead to unauthorized access
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to encrypted communications and sensitive information, posing a severe security
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risk.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText IN ("*export-certificate*") |
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rename Computer as dest | stats count min(_time) as firstTime max(_time) as lastTime
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by EventCode ScriptBlockText dest user_id | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `windows_powershell_export_certificate_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: It is possible administrators or scripts may run these commands,
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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 ("$dest$")
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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 related to exporting a Certificate was ran on $dest$,
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attempting to export a certificate.
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risk_objects:
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- field: dest
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type: system
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score: 36
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threat_objects: []
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tags:
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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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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/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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