Potential Persistence Via PowerShell User Profile Using Add-Content

 1title: Potential Persistence Via PowerShell User Profile Using Add-Content
 2id: 05b3e303-faf0-4f4a-9b30-46cc13e69152
 3status: test
 4description: Detects calls to "Add-Content" cmdlet in order to modify the content of the user profile and potentially adding suspicious commands for persistence
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.013/T1546.013.md
 7author: frack113, Nasreddine Bencherchali (Nextron Systems)
 8date: 2021/08/18
 9modified: 2023/05/04
10tags:
11    - attack.persistence
12    - attack.privilege_escalation
13    - attack.t1546.013
14logsource:
15    product: windows
16    category: ps_script
17    definition: 'Requirements: Script Block Logging must be enabled'
18detection:
19    selection_add:
20        ScriptBlockText|contains: 'Add-Content $profile'
21    selection_options:
22        ScriptBlockText|contains:
23            # Note: You can add more suspicious values
24            - '-Value "IEX '
25            - '-Value "Invoke-Expression'
26            - '-Value "Invoke-WebRequest'
27            - '-Value "Start-Process'
28            - "-Value 'IEX "
29            - "-Value 'Invoke-Expression"
30            - "-Value 'Invoke-WebRequest"
31            - "-Value 'Start-Process"
32    condition: all of selection_*
33falsepositives:
34    - Legitimate administration and tuning scripts that aim to add functionality to a user PowerShell session
35level: medium