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P4T12ICK
66 lines
2.2 KiB
YAML
66 lines
2.2 KiB
YAML
name: Certutil exe certificate extraction
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id: 337a46be-600f-11eb-ae93-0242ac130002
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version: 2
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date: '2022-07-15'
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author: Rod Soto, Splunk
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status: production
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type: TTP
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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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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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CommandLine: '*-exportPFX*'
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Image|endswith: certutil.exe
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condition: selection1
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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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- https://blog.sygnia.co/detection-and-hunting-of-golden-saml-attack
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- https://strontic.github.io/xcyclopedia/library/certutil.exe-09A8A29BAA3A451713FD3D07943B4A43.html
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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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- Living Off The Land
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asset_type: Endpoint
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confidence: 70
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impact: 90
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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: 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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risk_score: 63
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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/suspicious_behaviour/certutil_exe_certificate_extraction/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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