title: Suspicious Export-PfxCertificate
id: aa7a3fce-bef5-4311-9cc1-5f04bb8c308c
status: experimental
description: Detects Commandlet that is used to export certificates from the local certificate store and sometimes used by threat actors to steal provate keys from compromised machines
references:
    - https://us-cert.cisa.gov/ncas/analysis-reports/ar21-112a
    - https://docs.microsoft.com/en-us/powershell/module/pki/export-pfxcertificate
tags:
    - attack.credential_access
    - attack.t1552.004
author: Florian Roth
date: 2021/04/23
logsource:
    product: windows
    service: powershell
    definition: 'It is recommended to use the new "Script Block Logging" of PowerShell v5 https://adsecurity.org/?p=2277'
detection:
    keywords:
        EventID: 4104
        ScriptBlockText|contains:
            - "Export-PfxCertificate"
    condition: keywords
falsepositives:
    - Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)
level: high