Suspicious Scripting in a WMI Consumer

calendar Aug 12, 2024 · attack.execution attack.t1059.005  ·
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Detects suspicious commands that are related to scripting/powershell in WMI Event Consumers

Sigma rule (View on GitHub)

 1title: Suspicious Scripting in a WMI Consumer
 2id: fe21810c-2a8c-478f-8dd3-5a287fb2a0e0
 3status: test
 4description: Detects suspicious commands that are related to scripting/powershell in WMI Event Consumers
 5references:
 6    - https://in.security/an-intro-into-abusing-and-identifying-wmi-event-subscriptions-for-persistence/
 7    - https://github.com/Neo23x0/signature-base/blob/615bf1f6bac3c1bdc417025c40c073e6c2771a76/yara/gen_susp_lnk_files.yar#L19
 8    - https://github.com/RiccardoAncarani/LiquidSnake
 9author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro
10date: 2019-04-15
11modified: 2023-09-09
12tags:
13    - attack.execution
14    - attack.t1059.005
15logsource:
16    product: windows
17    category: wmi_event
18detection:
19    selection_destination:
20        - Destination|contains|all:
21              - 'new-object'
22              - 'net.webclient'
23              - '.downloadstring'
24        - Destination|contains|all:
25              - 'new-object'
26              - 'net.webclient'
27              - '.downloadfile'
28        - Destination|contains:
29              - ' iex('
30              - ' -nop '
31              - ' -noprofile '
32              - ' -decode '
33              - ' -enc '
34              - 'WScript.Shell'
35              - 'System.Security.Cryptography.FromBase64Transform'
36    condition: selection_destination
37fields:
38    - User
39    - Operation
40falsepositives:
41    - Legitimate administrative scripts
42level: high

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