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77 lines
2.7 KiB
YAML
77 lines
2.7 KiB
YAML
name: Certutil exe certificate extraction
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id: 337a46be-600f-11eb-ae93-0242ac130002
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version: 1
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date: '2021-01-26'
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author: Rod Soto, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This search looks for arguments to certutil.exe indicating the manipulation
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or extraction of Certificate. This certificate can then be used to sign new authentication
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tokens specially inside Federated environments such as Windows ADFS.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name=certutil.exe
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Processes.process = "*-exportPFX*" by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `certutil_exe_certificate_extraction_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node.
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known_false_positives: Unless there are specific use cases, manipulating or exporting
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certificates using certutil is uncommon. Extraction of certificate has been observed
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during attacks such as Golden SAML and other campaigns targeting Federated services.
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references: []
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tags:
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analytic_story:
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- Windows Persistence Techniques
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- Cloud Federated Credential Abuse
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asset_type: Endpoint
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automated_detection_testing: passed
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Privilege Escalation
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/suspicious_behaviour/certutil_exe_certificate_extraction/windows-sysmon.log
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impact: 90
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kill_chain_phases:
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- Installation
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ attempting export a certificate.
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Parent Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 63
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security_domain: endpoint
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