mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
65 lines
2.6 KiB
YAML
65 lines
2.6 KiB
YAML
name: Windows PowerShell Export Certificate
|
|
id: 5e38ded4-c964-41f4-8cb6-4a1a53c6929f
|
|
version: 2
|
|
date: '2024-05-18'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: Anomaly
|
|
description: The following analytic detects the use of the PowerShell Cmdlet `export-certificate`
|
|
by leveraging Script Block Logging. This activity is significant as it may indicate
|
|
an adversary attempting to exfiltrate certificates from the local Certificate Store
|
|
on a Windows endpoint. Monitoring this behavior is crucial because stolen certificates
|
|
can be used to impersonate users, decrypt sensitive data, or facilitate further
|
|
attacks. If confirmed malicious, this activity could lead to unauthorized access
|
|
to encrypted communications and sensitive information, posing a severe security
|
|
risk.
|
|
data_source:
|
|
- Powershell Script Block Logging 4104
|
|
search: '`powershell` EventCode=4104 ScriptBlockText IN ("*export-certificate*") |
|
|
rename Computer as dest | stats count min(_time) as firstTime max(_time) as lastTime
|
|
by EventCode ScriptBlockText dest user_id | `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)` | `windows_powershell_export_certificate_filter`'
|
|
how_to_implement: To successfully implement this analytic, you will need to enable
|
|
PowerShell Script Block Logging on some or all endpoints. Additional setup here
|
|
https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
|
|
known_false_positives: It is possible administrators or scripts may run these commands,
|
|
filtering may be required.
|
|
references:
|
|
- https://dev.to/iamthecarisma/managing-windows-pfx-certificates-through-powershell-3pj
|
|
- https://learn.microsoft.com/en-us/powershell/module/pki/export-certificate?view=windowsserver2022-ps
|
|
tags:
|
|
analytic_story:
|
|
- Windows Certificate Services
|
|
asset_type: Endpoint
|
|
confidence: 60
|
|
impact: 60
|
|
message: A PowerShell Cmdlet related to exporting a Certificate was ran on $dest$,
|
|
attempting to export a certificate.
|
|
mitre_attack_id:
|
|
- T1552.004
|
|
- T1552
|
|
- T1649
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- ScriptBlockText
|
|
- dest
|
|
- EventCode
|
|
risk_score: 36
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1649/atomic_red_team/4104_export_certificate.log
|
|
source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
|
|
sourcetype: xmlwineventlog
|