Sigma rule: Change Winevt Channel Access Permission Via Registry

Rule

Title

Change Winevt Channel Access Permission Via Registry

Status

test

Level

high

Author

frack113

Date

2022-09-17

Modified

2024-03-25

File

rules/windows/registry/registry_set/registry_set_change_winevt_channelaccess.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects tampering with the "ChannelAccess" registry key in order to change access to Windows event channel.

Log source

product

windows

category

registry_set

Detection

selection:
    TargetObject|contains: '\Microsoft\Windows\CurrentVersion\WINEVT\Channels\'
    TargetObject|endswith: '\ChannelAccess'
    # Add more interesting combinations if you found them
    Details|contains:
        - '(A;;0x1;;;LA)' # Local administrator having GENERIC ALL
        - '(A;;0x1;;;SY)' # Local System having GENERIC ALL
        - '(A;;0x5;;;BA)' # Built-in administrators having GENERIC ALL and  GENERIC WRITE
filter_main_trustedinstaller:
    Image: 'C:\Windows\servicing\TrustedInstaller.exe'
filter_main_tiworker:
    Image|startswith: 'C:\Windows\WinSxS\'
    Image|endswith: '\TiWorker.exe'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.defense-impairment
• attack.t1685.001

MITRE ATT&CK ids this rule names

• T1685.001

References

• https://app.any.run/tasks/77b2e328-8f36-46b2-b2e2-8a80398217ab/
• https://learn.microsoft.com/en-us/windows/win32/api/winevt/
• https://itconnect.uw.edu/tools-services-support/it-systems-infrastructure/msinf/other-help/understanding-sddl-syntax/

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_set/registry_set_change_winevt_channelaccess.yml