LoFP LoFP / rare falsepositives may occur from legitimate administrators disabling specific event log for troubleshooting

Techniques

Sample rules

Disable Windows Event Logging Via Registry

Description

Detects tampering with the “Enabled” registry key in order to disable Windows logging of a Windows event channel

Detection logic

condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
filter_main_iis:
  Image|endswith: \TiWorker.exe
  Image|startswith: C:\Windows\winsxs\
filter_main_svchost:
  Image: C:\Windows\System32\svchost.exe
  TargetObject|contains:
  - \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-FileInfoMinifilter
  - \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-ASN1\
  - \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Kernel-AppCompat\
  - \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Runtime\Error\
  - \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-CAPI2/Operational\
filter_main_trusted_installer:
  Image: C:\Windows\servicing\TrustedInstaller.exe
  TargetObject|contains: \Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Compat-Appraiser
filter_main_wevutil:
  Image: C:\Windows\system32\wevtutil.exe
filter_optional_empty:
  Image: ''
filter_optional_null:
  Image: null
selection:
  Details: DWORD (0x00000000)
  TargetObject|contains: \Microsoft\Windows\CurrentVersion\WINEVT\Channels\
  TargetObject|endswith: \Enabled