Suspicious Service DACL Modification Via Set-Service Cmdlet - PS

calendar Oct 17, 2023 · attack.persistence attack.defense_evasion attack.privilege_escalation attack.t1574.011  ·
Share on: linkedin copy

Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)

Sigma rule (View on GitHub)

 1title: Suspicious Service DACL Modification Via Set-Service Cmdlet - PS
 2id: 22d80745-6f2c-46da-826b-77adaededd74
 3related:
 4    - id: a95b9b42-1308-4735-a1af-abb1c5e6f5ac
 5      type: similar
 6status: test
 7description: Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)
 8references:
 9    - https://twitter.com/Alh4zr3d/status/1580925761996828672
10    - https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.management/set-service?view=powershell-7.2
11author: Nasreddine Bencherchali (Nextron Systems)
12date: 2022/10/24
13tags:
14    - attack.persistence
15    - attack.defense_evasion
16    - attack.privilege_escalation
17    - attack.t1574.011
18logsource:
19    product: windows
20    category: ps_script
21    definition: 'Requirements: Script Block Logging must be enabled'
22detection:
23    selection_sddl_flag:
24        ScriptBlockText|contains:
25            - '-SecurityDescriptorSddl '
26            - '-sd '
27    selection_set_service:
28        ScriptBlockText|contains|all:
29            - 'Set-Service '
30            - 'D;;'
31        ScriptBlockText|contains:
32            - ';;;IU'
33            - ';;;SU'
34            - ';;;BA'
35            - ';;;SY'
36            - ';;;WD'
37    condition: all of selection_*
38falsepositives:
39    - Rare intended use of hidden services
40    - Rare FP could occur due to the non linearity of the ScriptBlockText log
41level: high

References

  • Something went wrong, but don’t fret — let’s give it another shot.


    Read More

  • Set-Service (Microsoft.PowerShell.Management) - PowerShell

    This cmdlet is only available on the Windows platform. The Set-Service cmdlet changes the properties of a service such as the Status, Description, DisplayName, and StartupType. Set-Service can start, stop, suspend, or pause a service. To identify a service, enter its service name or submit a service object. Or, send a service name or service object down the pipeline to Set-Service.


    Read More

Related rules

to-top