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Description

The following analytic identifies when a certificate is exported from the Windows Certificate Store. This analytic utilizes the Certificates Lifecycle log channel event ID 1007. EventID 1007 is focused on the Export of a certificate from the local certificate store. In addition, review the ProcessName field as it will help to determine automation/Admin or adversary extracting the certificate. Depending on the organization, the certificate may be used for authentication to the VPN or private resources.

  • Type: Anomaly

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2023-02-11
  • Author: Michael Haag, Splunk
  • ID: d8ddfa9b-b724-4df9-9dbe-f34cc0936714

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1552.004 Private Keys Credential Access
T1552 Unsecured Credentials Credential Access
T1649 Steal or Forge Authentication Certificates Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.AE
CIS20
  • CIS 10
CVE 


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`certificateservices_lifecycle` EventCode=1007 
| xmlkv UserData_Xml 
| stats count min(_time) as firstTime max(_time) as lastTime by Computer, SubjectName, UserData_Xml 
| rename Computer as dest 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `windows_export_certificate_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_export_certificate_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • dest
  • SubjectName
  • UserData_Xml

How To Implement

To implement this analytic, you must collect Microsoft-Windows-CertificateServicesClient-Lifecycle-System/Operational or Microsoft-Windows-CertificateServicesClient-Lifecycle-User/Operational.

Known False Positives

False positives may be generated based on an automated process or service that exports certificates on the regular. Review is required before setting to alert. Monitor for abnormal processes performing an export.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
36.0 60 60 An certificate was exported on $dest$ from the Windows Certificate Store.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2