Suspicious WSMAN Provider Image Loads

Detects signs of potential use of the WSMAN provider from uncommon processes locally and remote execution.

Sigma rule (View on GitHub)

 1title: Suspicious WSMAN Provider Image Loads
 2id: ad1f4bb9-8dfb-4765-adb6-2a7cfb6c0f94
 3status: test
 4description: Detects signs of potential use of the WSMAN provider from uncommon processes locally and remote execution.
 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://learn.microsoft.com/en-us/windows/win32/winrm/windows-remote-management-architecture
 9    - https://github.com/bohops/WSMan-WinRM
10author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
11date: 2020/06/24
12modified: 2022/10/07
13tags:
14    - attack.execution
15    - attack.t1059.001
16    - attack.lateral_movement
17    - attack.t1021.003
18logsource:
19    category: image_load
20    product: windows
21detection:
22    request_client:
23        - ImageLoaded|endswith:
24              - '\WsmSvc.dll'
25              - '\WsmAuto.dll'
26              - '\Microsoft.WSMan.Management.ni.dll'
27        - OriginalFileName:
28              - 'WsmSvc.dll'
29              - 'WSMANAUTOMATION.DLL'
30              - 'Microsoft.WSMan.Management.dll'
31    respond_server:
32        Image|endswith: '\svchost.exe'
33        OriginalFileName: 'WsmWmiPl.dll'
34    filter_general:
35        Image|endswith:
36            - '\powershell.exe'
37            - 'C:\Windows\System32\sdiagnhost.exe'
38            - 'C:\Windows\System32\services.exe'
39    filter_svchost: # not available in Sysmon data, but Aurora logs
40        CommandLine|contains:
41            - 'svchost.exe -k netsvcs -p -s BITS'
42            - 'svchost.exe -k GraphicsPerfSvcGroup -s GraphicsPerfSvc'
43            - 'svchost.exe -k NetworkService -p -s Wecsvc'
44            - 'svchost.exe -k netsvcs'
45    filter_mscorsvw: # Image: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe
46        Image|startswith:
47            - 'C:\Windows\Microsoft.NET\Framework64\v'
48            - 'C:\Windows\Microsoft.NET\Framework\v'
49        Image|endswith: '\mscorsvw.exe'
50    filter_svr_2019:
51        Image:
52            - 'C:\Windows\System32\Configure-SMRemoting.exe'
53            - 'C:\Windows\System32\ServerManager.exe'
54    filter_nextron:
55        Image|startswith: 'C:\Windows\Temp\asgard2-agent\'
56    filter_citrix:
57        Image|startswith: 'C:\Program Files\Citrix\'
58    filter_ps_ise:
59        Image|endswith: '\powershell_ise.exe'
60    filter_upgrade:
61        Image|startswith: 'C:\$WINDOWS.~BT\Sources\'
62    svchost:
63        Image|endswith: '\svchost.exe'
64    commandline_null:
65        CommandLine: null
66    condition: ( request_client or respond_server ) and not 1 of filter* and not ( svchost and commandline_null )
67falsepositives:
68    - Unknown
69level: medium

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