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Eric
78 lines
3.7 KiB
YAML
78 lines
3.7 KiB
YAML
name: Logon Script Event Trigger Execution
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id: 4c38c264-1f74-11ec-b5fa-acde48001122
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version: 7
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date: '2025-05-02'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the modification of the UserInitMprLogonScript
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registry entry, which is often used by attackers to establish persistence and gain
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privilege escalation upon system boot. It leverages data from the Endpoint.Registry
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data model, focusing on changes to the specified registry path. This activity is
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significant because it is a common technique used by APT groups and malware to ensure
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their payloads execute automatically when the system starts. If confirmed malicious,
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this could allow attackers to maintain persistent access and potentially escalate
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their privileges on the compromised host.
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data_source:
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- Sysmon EventID 13
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
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max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path
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IN ("*\\Environment\\UserInitMprLogonScript") by Registry.action Registry.dest Registry.process_guid
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Registry.process_id Registry.registry_hive Registry.registry_path Registry.registry_key_name
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Registry.registry_value_data Registry.registry_value_name Registry.registry_value_type
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Registry.status Registry.user Registry.vendor_product | `security_content_ctime(lastTime)`
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| `security_content_ctime(firstTime)` | `drop_dm_object_name(Registry)` | `logon_script_event_trigger_execution_filter`'
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how_to_implement: To successfully implement this search, you must be ingesting data
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that records registry activity from your hosts to populate the endpoint data model
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in the registry node. This is typically populated via endpoint detection-and-response
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product, such as Carbon Black or endpoint data sources, such as Sysmon. The data
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used for this search is typically generated via logs that report reads and writes
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to the registry.
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known_false_positives: unknown
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references:
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- https://attack.mitre.org/techniques/T1037/001/
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drilldown_searches:
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- name: View the detection results for - "$dest$" and "$user$"
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search: '%original_detection_search% | search dest = "$dest$" user = "$user$"'
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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 - "$dest$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$",
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"$user$") 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: Registry path $registry_path$ was modified, added, or deleted 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: 80
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- field: user
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type: user
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score: 80
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threat_objects: []
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tags:
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analytic_story:
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- Data Destruction
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- Windows Privilege Escalation
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- Hermetic Wiper
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- Windows Persistence Techniques
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asset_type: Endpoint
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mitre_attack_id:
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- T1037.001
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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/T1037.001/logonscript_reg/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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