sigmamediumHunting

Suspicious X509Enrollment - Ps Script

Detect use of X509Enrollment

MITRE ATT&CK

defense-evasion

Detection Query

selection:
  ScriptBlockText|contains:
    - X509Enrollment.CBinaryConverter
    - 884e2002-217d-11da-b2a4-000e7bbb2b09
condition: selection

Author

frack113

Created

2022-12-23

Data Sources

windowsps_script

Platforms

windows

References

Tags

attack.defense-evasionattack.t1553.004

Raw Content

title: Suspicious X509Enrollment - Ps Script
id: 504d63cb-0dba-4d02-8531-e72981aace2c
related:
    - id: 114de787-4eb2-48cc-abdb-c0b449f93ea4
      type: similar
status: test
description: Detect use of X509Enrollment
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=42
    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=41
    - https://learn.microsoft.com/en-us/dotnet/api/microsoft.hpc.scheduler.store.cx509enrollmentwebclassfactoryclass?view=hpc-sdk-5.1.6115
author: frack113
date: 2022-12-23
tags:
    - attack.defense-evasion
    - attack.t1553.004
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'X509Enrollment.CBinaryConverter'
            - '884e2002-217d-11da-b2a4-000e7bbb2b09'
    condition: selection
falsepositives:
    - Legitimate administrative script
level: medium