Important Windows Eventlog Cleared

Severity: high
Author: Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects the clearing of one of the Windows Core Eventlogs. e.g. caused by "wevtutil cl" command execution

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1070.001` Indicator Removal: Clear Windows Event Logs

Event coverage

Provider	Event ID	Title
Eventlog	104	The LogFileCleared.Channel log file was cleared.

Stages and Predicates

Stage 1: `selection`

Channel: ['Microsoft-Windows-PowerShell/Operational', 'Microsoft-Windows-Sysmon/Operational', 'PowerShellCore/Operational', Security, System, 'Windows PowerShell']
Provider_Name: Microsoft-Windows-Eventlog

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Channel`	eq	`Microsoft-Windows-PowerShell/Operational` corpus 2 (sigma 2) `Microsoft-Windows-Sysmon/Operational` corpus 2 (sigma 2) `PowerShellCore/Operational` corpus 2 (sigma 2) `Security` corpus 2 (sigma 2) `System` corpus 2 (sigma 2) `Windows PowerShell` corpus 2 (sigma 2)
`Provider_Name`	eq	`Microsoft-Windows-Eventlog` corpus 3 (sigma 3)

Neighbors

Broader alternatives (more inclusive than this rule)

These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.

Eventlog Cleared [sigma] (drops 1 filter this rule applies) (first-stage match only; downstream stages may differ)