Whoami.EXE Execution Anomaly

calendar Dec 21, 2023 · attack.discovery attack.t1033 car.2016-03-001  ·
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Detects the execution of whoami.exe with suspicious parent processes.

Sigma rule (View on GitHub)

 1title: Whoami.EXE Execution Anomaly
 2id: 8de1cbe8-d6f5-496d-8237-5f44a721c7a0
 3status: experimental
 4description: Detects the execution of whoami.exe with suspicious parent processes.
 5references:
 6    - https://brica.de/alerts/alert/public/1247926/agent-tesla-keylogger-delivered-inside-a-power-iso-daa-archive/
 7    - https://app.any.run/tasks/7eaba74e-c1ea-400f-9c17-5e30eee89906/
 8    - https://www.youtube.com/watch?v=DsJ9ByX84o4&t=6s
 9author: Florian Roth (Nextron Systems)
10date: 2021/08/12
11modified: 2023/12/04
12tags:
13    - attack.discovery
14    - attack.t1033
15    - car.2016-03-001
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection:
21        - Image|endswith: '\whoami.exe'
22        - OriginalFileName: 'whoami.exe'
23    filter_main_known_parents:
24        # This list can be any legitimate shell or application that you expect whoami to run from
25        ParentImage|endswith:
26            - '\cmd.exe'
27            - '\powershell_ise.exe'
28            - '\powershell.exe'
29            - '\pwsh.exe'
30    filter_optional_ms_monitoring_agent:
31        ParentImage|endswith: ':\Program Files\Microsoft Monitoring Agent\Agent\MonitoringHost.exe'
32    filter_main_parent_null:
33        ParentImage: null
34    filter_main_parent_empty:
35        ParentImage: ''
36    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
37falsepositives:
38    - Admin activity
39    - Scripts and administrative tools used in the monitored environment
40    - Monitoring activity
41level: medium

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