Sigma rule: Potential DLL Injection Via AccCheckConsole

Rule

Title

Potential DLL Injection Via AccCheckConsole

Status

test

Level

medium

Author

Florian Roth (Nextron Systems)

Date

2022-01-06

Modified

2024-08-29

File

rules/windows/process_creation/proc_creation_win_acccheckconsole_execution.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the execution "AccCheckConsole" a command-line tool for verifying the accessibility implementation of an application's UI.
One of the tests that this checker can run are called "verification routine", which tests for things like Consistency, Navigation, etc.
The tool allows a user to provide a DLL that can contain a custom "verification routine". An attacker can build such DLLs and pass it via the CLI, which would then be loaded in the context of the "AccCheckConsole" utility.

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith: '\AccCheckConsole.exe'
    - OriginalFileName: 'AccCheckConsole.exe'
selection_cli:
    CommandLine|contains:
        - ' -hwnd'
        - ' -process '
        - ' -window '
condition: all of selection_*

False positives (as the rule lists them)

• Legitimate use of the UI Accessibility Checker

Tags

• attack.execution
• detection.threat-hunting

References

• https://gist.github.com/bohops/2444129419c8acf837aedda5f0e7f340
• https://twitter.com/bohops/status/1477717351017680899?s=12
• https://lolbas-project.github.io/lolbas/OtherMSBinaries/AccCheckConsole/

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/process_creation/proc_creation_win_acccheckconsole_execution.yml