Sigma rule: Atbroker Registry Change

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-bd40e2a9c0ab, updated 2023-01-19T00:00:00.000Z.

Rule

Title
Atbroker Registry Change
Status
test
Level
medium
Author
Mateusz Wydra, oscd.community
Date
2020-10-13
Modified
2023-01-19
File
rules/windows/registry/registry_event/registry_event_susp_atbroker_change.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects creation/modification of Assistive Technology applications and persistence with usage of 'at'

Log source

product
windows
category
registry_event

Detection

selection:
    TargetObject|contains:
        - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
        - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
filter_atbroker:
    Image: 'C:\Windows\system32\atbroker.exe'
    TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
    Details: '(Empty)'
filter_uninstallers:
    Image|startswith: 'C:\Windows\Installer\MSI'
    TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
condition: selection and not 1 of filter_*

False positives (as the rule lists them)

  • Creation of non-default, legitimate at usage

Tags

  • attack.privilege-escalation
  • attack.stealth
  • attack.t1218
  • attack.persistence
  • attack.t1547

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/registry/registry_event/registry_event_susp_atbroker_change.yml

Sources and licences

  • SigmaHQ

    "Atbroker Registry Change" by Mateusz Wydra, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_event/registry_event_susp_atbroker_change.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: Atbroker Registry Change",
entity page, dataset version ref-bd40e2a9c0ab, updated 2023-01-19T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9577edbb-851f-4243-8c91-1d5b50c1a39b (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9577edbb-851f-4243-8c91-1d5b50c1a39b, 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.