Atbroker Registry Change

calendar Oct 23, 2025 · attack.privilege-escalation attack.defense-evasion attack.t1218 attack.persistence attack.t1547  ·
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Detects creation/modification of Assistive Technology applications and persistence with usage of 'at'

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 1title: Atbroker Registry Change
 2id: 9577edbb-851f-4243-8c91-1d5b50c1a39b
 3status: test
 4description: Detects creation/modification of Assistive Technology applications and persistence with usage of 'at'
 5references:
 6    - http://www.hexacorn.com/blog/2016/07/22/beyond-good-ol-run-key-part-42/
 7    - https://lolbas-project.github.io/lolbas/Binaries/Atbroker/
 8author: Mateusz Wydra, oscd.community
 9date: 2020-10-13
10modified: 2023-01-19
11tags:
12    - attack.privilege-escalation
13    - attack.defense-evasion
14    - attack.t1218
15    - attack.persistence
16    - attack.t1547
17logsource:
18    category: registry_event
19    product: windows
20detection:
21    selection:
22        TargetObject|contains:
23            - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
24            - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
25    filter_atbroker:
26        Image: 'C:\Windows\system32\atbroker.exe'
27        TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
28        Details: '(Empty)'
29    filter_uninstallers:
30        Image|startswith: 'C:\Windows\Installer\MSI'
31        TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
32    condition: selection and not 1 of filter_*
33falsepositives:
34    - Creation of non-default, legitimate at usage
35level: medium

References

  • Beyond good ol’ Run key, Part 42

    The Ease of Access is a place where a computer user can enable the so-called Assistive Technologies (AT). These technologies make life easier for the users with needs and include OSK (On-Screen Key...


    Read More

  • Atbroker on LOLBAS

    Atbroker.exe is a living-of-the-land file containing unexpected functionality that can be abused by attackers; this page lists all its use cases.


    Read More

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