Atbroker Registry Change

calendar Dec 1, 2023 · 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'

Sigma rule (View on GitHub)

 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.defense_evasion
13    - attack.t1218
14    - attack.persistence
15    - attack.t1547
16logsource:
17    category: registry_event
18    product: windows
19detection:
20    selection:
21        TargetObject|contains:
22            - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
23            - 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
24    filter_atbroker:
25        Image: 'C:\Windows\system32\atbroker.exe'
26        TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
27        Details: '(Empty)'
28    filter_uninstallers:
29        Image|startswith: 'C:\Windows\Installer\MSI'
30        TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
31    condition: selection and not 1 of filter_*
32falsepositives:
33    - Creation of non-default, legitimate at usage
34level: 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 | LOLBAS

    Start a registered Assistive Technology (AT). ATBroker.exe /start malware Use caseExecutes code defined in registry for a new AT. Modifications must be made to the system registry to either registe...


    Read More

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