Renamed Whoami Execution — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: critical. Source dates: 2021-08-12 / 2022-10-09.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6202f588c35467a152e4fe1917be432a02d6e66b2d5b1ce637eb4f4489f80e61

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Renamed Whoami Execution
id: f1086bf7-a0c4-4a37-9102-01e573caf4a0
status: test
description: Detects the execution of whoami that has been renamed to a different name to avoid detection
references:
    - https://brica.de/alerts/alert/public/1247926/agent-tesla-keylogger-delivered-inside-a-power-iso-daa-archive/
    - https://app.any.run/tasks/7eaba74e-c1ea-400f-9c17-5e30eee89906/
author: Florian Roth (Nextron Systems)
date: 2021-08-12
modified: 2022-10-09
tags:
    - attack.discovery
    - attack.t1033
    - car.2016-03-001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        OriginalFileName: 'whoami.exe'
    filter:
        Image|endswith: '\whoami.exe'
    condition: selection and not filter
falsepositives:
    - Unknown
level: critical

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://brica.de/alerts/alert/public/1247926/agent-tesla-keylogger-delivered-inside-a-power-iso-daa-archive/
• https://app.any.run/tasks/7eaba74e-c1ea-400f-9c17-5e30eee89906/