Phoenix Studio
Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
Ready to search
Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
Suspicious Eventlog Clear
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious Eventlog Clear
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Suspicious Eventlog Clear
id: 0f017df3-8f5a-414f-ad6b-24aff1128278
related:
- id: cc36992a-4671-4f21-a91d-6c2b72a2edf5
type: derived
status: test
description: Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs
references:
- https://twitter.com/oroneequalsone/status/1568432028361830402
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.001/T1070.001.md
- https://eqllib.readthedocs.io/en/latest/analytics/5b223758-07d6-4100-9e11-238cfdd0fe97.html
- https://stackoverflow.com/questions/66011412/how-to-clear-a-event-log-in-powershell-7
- https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventing.reader.eventlogsession.clearlog?view=windowsdesktop-9.0&viewFallbackFrom=dotnet-plat-ext-5.0#System_Diagnostics_Eventing_Reader_EventLogSession_ClearLog_System_String_
- https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear
author: Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2022-09-12
modified: 2025-10-06
tags:
- attack.defense-evasion
- attack.t1070.001
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection:
- ScriptBlockText|contains:
- 'Clear-EventLog '
- 'Remove-EventLog '
- 'Limit-EventLog '
- 'Clear-WinEvent '
- ScriptBlockText|contains|all:
- 'Eventing.Reader.EventLogSession' # [System.Diagnostics.Eventing.Reader.EventLogSession]::GlobalSession.ClearLog($_.LogName)
- 'ClearLog'
- ScriptBlockText|contains|all:
- 'Diagnostics.EventLog'
- 'Clear'
condition: selection
falsepositives:
- Rare need to clear logs before doing something. Sometimes used by installers or cleaner scripts. The script should be investigated to determine if it's legitimate
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/powershell/powershell_script/posh_ps_susp_clear_eventlog.yml