ESXi Account Creation Via ESXCLI — Sigma Rule

Rule metadata and linked tags

Author: Cedric Maurugeon. Source status: test; severity: medium. Source dates: 2023-08-22 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 487a4c1c9589e5bac38067c856a9496b247204b3a62588e76dcf1a6f3005265f

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: ESXi Account Creation Via ESXCLI
id: b28e4eb3-8bbc-4f0c-819f-edfe8e2f25db
status: test
description: Detects user account creation on ESXi system via esxcli
references:
    - https://developer.broadcom.com/xapis/esxcli-command-reference/7.0.0/namespace/esxcli_system.html
author: Cedric Maurugeon
date: 2023-08-22
tags:
    - attack.persistence
    - attack.execution
    - attack.t1136
    - attack.t1059.012
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/esxcli'
        CommandLine|contains|all:
            - 'system '
            - 'account '
            - 'add '
    condition: selection
falsepositives:
    - Legitimate administration activities
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate administration activities

Source references

• https://developer.broadcom.com/xapis/esxcli-command-reference/7.0.0/namespace/esxcli_system.html