Root Certificate Installed - PowerShell

Description

Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.

Query · sigma

selection1:
  ScriptBlockText|contains|all:
  - Move-Item
  - Cert:\LocalMachine\Root
selection2:
  ScriptBlockText|contains|all:
  - Import-Certificate
  - Cert:\LocalMachine\Root
condition: 1 of selection*

Known false positives

  • Help Desk or IT may need to manually add a corporate Root CA on occasion. Need to test if GPO push doesn't trigger FP
Raw source Root Certificate Installed - PowerShell · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Root Certificate Installed - PowerShell
id: 42821614-9264-4761-acfc-5772c3286f76
status: test
description: Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1553.004/T1553.004.md
author: 'oscd.community, @redcanary, Zach Stanford @svch0st'
date: 2020-10-10
modified: 2022-12-02
tags:
    - attack.defense-impairment
    - attack.t1553.004
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection1:
        ScriptBlockText|contains|all:
            - 'Move-Item'
            - 'Cert:\LocalMachine\Root'
    selection2:
        ScriptBlockText|contains|all:
            - 'Import-Certificate'
            - 'Cert:\LocalMachine\Root'
    condition: 1 of selection*
falsepositives:
    - Help Desk or IT may need to manually add a corporate Root CA on occasion. Need to test if GPO push doesn't trigger FP
level: medium

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