Suspicious New or Renamed User Account with '$' Character (via security)

title: Suspicious New or Renamed User Account with '$' Character (via security)
id: d1689612-25a8-5bfe-b237-a9cd6865133b
status: stable
description: This rule detects the creation of a user with the "$" character. This can be used by adversaries to hide a user or trick detection systems that lack the parsing mechanisms.
references:
    - https://attack.mitre.org/techniques/T1036/
    - https://twitter.com/SBousseaden/status/1387743867663958021
author: Huntrule Team
date: 2026-01-12
tags:
    - attack.stealth
    - attack.t1036
logsource:
    product: windows
    service: security
detection:
    selection_create:
        EventID: 4720
        SamAccountName|contains: '$'
    selection_rename:
        EventID: 4781
        NewTargetUserName|contains: '$'
    filter_main_homegroup:
        EventID: 4720
        TargetUserName: 'HomeGroupUser$'
    condition: 1 of selection_* and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium