Suspicious Whoami.EXE Execution

calendar Nov 10, 2023 · attack.discovery attack.t1033 car.2016-03-001  ·
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Detects the execution of "whoami.exe" with the "/all" flag or with redirection options to export the results to a file for later use.

Sigma rule (View on GitHub)

 1title: Suspicious Whoami.EXE Execution
 2id: c30fb093-1109-4dc8-88a8-b30d11c95a5d
 3status: experimental
 4description: Detects the execution of "whoami.exe" with the "/all" flag or with redirection options to export the results to a file for later use.
 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), Nasreddine Bencherchali (Nextron Systems)
10date: 2023/02/28
11modified: 2023/11/10
12tags:
13    - attack.discovery
14    - attack.t1033
15    - car.2016-03-001
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_main_img:
21        - Image|endswith: '\whoami.exe'
22        - OriginalFileName: 'whoami.exe'
23    selection_main_cli:
24        CommandLine|contains:
25            - ' -all'
26            - ' /all'
27            - ' /FO CSV'
28            - ' -FO CSV'
29    selection_special:
30        CommandLine|contains: 'whoami*>'
31    condition: all of selection_main_* or selection_special
32falsepositives:
33    - Unknown
34level: high

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