Root Certificate Installed - PowerShell

calendar Oct 17, 2023 · attack.defense_evasion attack.t1553.004  ·
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Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.

Sigma rule (View on GitHub)

 1title: Root Certificate Installed - PowerShell
 2id: 42821614-9264-4761-acfc-5772c3286f76
 3status: test
 4description: Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1553.004/T1553.004.md
 7author: 'oscd.community, @redcanary, Zach Stanford @svch0st'
 8date: 2020/10/10
 9modified: 2022/12/02
10tags:
11    - attack.defense_evasion
12    - attack.t1553.004
13logsource:
14    product: windows
15    category: ps_script
16    definition: 'Requirements: Script Block Logging must be enabled'
17detection:
18    selection1:
19        ScriptBlockText|contains|all:
20            - 'Move-Item'
21            - 'Cert:\LocalMachine\Root'
22    selection2:
23        ScriptBlockText|contains|all:
24            - 'Import-Certificate'
25            - 'Cert:\LocalMachine\Root'
26    condition: 1 of selection*
27falsepositives:
28    - 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
29level: medium

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