Suspicious Non PowerShell WSMAN COM Provider

calendar Oct 8, 2024 · attack.execution attack.t1059.001 attack.lateral-movement attack.t1021.003  ·
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Detects suspicious use of the WSMAN provider without PowerShell.exe as the host application.

Sigma rule (View on GitHub)

 1title: Suspicious Non PowerShell WSMAN COM Provider
 2id: df9a0e0e-fedb-4d6c-8668-d765dfc92aa7
 3status: test
 4description: Detects suspicious use of the WSMAN provider without PowerShell.exe as the host application.
 5references:
 6    - https://twitter.com/chadtilbury/status/1275851297770610688
 7    - https://bohops.com/2020/05/12/ws-management-com-another-approach-for-winrm-lateral-movement/
 8    - https://github.com/bohops/WSMan-WinRM
 9author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
10date: 2020-06-24
11modified: 2024-10-08
12tags:
13    - attack.execution
14    - attack.t1059.001
15    - attack.lateral-movement
16    - attack.t1021.003
17logsource:
18    product: windows
19    service: powershell-classic
20detection:
21    selection:
22        Data|contains: 'ProviderName=WSMan'
23    filter_main_ps:
24        Data|contains:
25            - 'HostApplication=powershell'
26            - 'HostApplication=C:\Windows\System32\WindowsPowerShell\v1.0\powershell'
27            - 'HostApplication=C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell'
28            # In some cases powershell was invoked with inverted slashes
29            - 'HostApplication=C:/Windows/System32/WindowsPowerShell/v1.0/powershell'
30            - 'HostApplication=C:/Windows/SysWOW64/WindowsPowerShell/v1.0/powershell'
31    filter_main_host_application_null:
32        # Note: Since we're using the raw data field to match. There is no easy way to filter out cases where the "HostApplication" field is null (i.e doesn't exist). We're practically forced to use a regex.
33        # If you're already mapping and extracting the field, then obviously use that directly.
34        Data|re: 'HostId=[a-zA-Z0-9-]{36} EngineVersion='
35    condition: selection and not 1 of filter_main_*
36falsepositives:
37    - Unknown
38level: medium

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