mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
49 lines
2.9 KiB
YAML
49 lines
2.9 KiB
YAML
name: ESXi Encryption Settings Modified
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id: dbbbe26f-83fe-4ee3-8b77-ccf7fbd416c8
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version: 5
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creation_date: '2025-07-11'
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modification_date: '2026-05-13'
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author: Raven Tait, Splunk
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status: production
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type: TTP
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description: Detects the disabling of critical encryption enforcement settings on an ESXi host, such as secure boot or executable verification requirements, which may indicate an attempt to weaken hypervisor integrity or allow unauthorized code execution.
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data_source:
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- VMWare ESXi Syslog
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search: '`esxi_syslog` Message="*system settings encryption set*" NOT Message="*shell.*" Message IN ("* -s *", "* -e *","*--require-secure-boot*", "*require-exec-installed-only*", "execInstalledOnly") | rex field=_raw "Z (?<dest>[\w\.]*)\s.*\]: \[(?<user>\w+)\]:(?<command>.+)" | stats min(_time) as firstTime max(_time) as lastTime count by dest user command | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `esxi_encryption_settings_modified_filter`'
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how_to_implement: This is based on syslog data generated by VMware ESXi hosts. To implement this search, you must configure your ESXi systems to forward syslog output to your Splunk deployment. These logs must be ingested with the appropriate Splunk Technology Add-on for VMware ESXi Logs, which provides field extractions and CIM compatibility.
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known_false_positives: Limited false positives in most environments, however tune as needed.
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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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finding:
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title: Encryption settings modified on ESXi host $dest$.
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entity:
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field: dest
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type: system
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score: 50
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analytic_story:
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- ESXi Post Compromise
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- Black Basta Ransomware
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asset_type: Infrastructure
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mitre_attack_id:
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- T1685
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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: application
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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/T1562/esxi_encryption_modified/esxi_encryption_modified.log
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source: vmware:esxlog
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sourcetype: vmw-syslog
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test_type: unit
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