Sigma rule: New or Renamed User Account with '$' Character

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-4a0d468ad9ca, updated 2024-01-16T00:00:00.000Z.

Rule

Title
New or Renamed User Account with '$' Character
Status
test
Level
medium
Author
Ilyas Ochkov, oscd.community
Date
2019-10-25
Modified
2024-01-16
File
rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of a user with the "$" character. This can be used by attackers to hide a user or trick detection systems that lack the parsing mechanisms.

Log source

product
windows
service
security

Detection

selection_create:
    EventID: 4720 # create user
    SamAccountName|contains: '$'
selection_rename:
    EventID: 4781 # rename user
    NewTargetUserName|contains: '$'
filter_main_homegroup:
    EventID: 4720
    TargetUserName: 'HomeGroupUser$'
condition: 1 of selection_* and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1036

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/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml

Sources and licences

  • SigmaHQ

    "New or Renamed User Account with '$' Character" by Ilyas Ochkov, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.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: New or Renamed User Account with '$' Character",
entity page, dataset version ref-4a0d468ad9ca, updated 2024-01-16T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/cfeed607-6aa4-4bbd-9627-b637deb723c8 (accessed 2026-11-03).
Underlying source: SigmaHQ rule cfeed607-6aa4-4bbd-9627-b637deb723c8, 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.