Sigma rule: Group Membership Reconnaissance Via Whoami.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-3f94d7d1c445, updated 2023-02-28T00:00:00.000Z.

Rule

Title
Group Membership Reconnaissance Via Whoami.EXE
Status
test
Level
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-02-28
File
rules/windows/process_creation/proc_creation_win_whoami_groups_discovery.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the execution of whoami.exe with the /group command line flag to show group membership for the current user, account type, security identifiers (SID), and attributes.

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\whoami.exe'
    - OriginalFileName: 'whoami.exe'
selection_cli:
    CommandLine|contains:
        - ' /groups'
        - ' -groups'
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.discovery
  • attack.t1033

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_whoami_groups_discovery.yml

Sources and licences

  • SigmaHQ

    "Group Membership Reconnaissance Via Whoami.EXE" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_whoami_groups_discovery.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Group Membership Reconnaissance Via Whoami.EXE",
entity page, dataset version ref-3f94d7d1c445, updated 2023-02-28T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bd8b828d-0dca-48e1-8a63-8a58ecf2644f (accessed 2026-11-03).
Underlying source: SigmaHQ rule bd8b828d-0dca-48e1-8a63-8a58ecf2644f, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.