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Sigma detection rules

6 rules indexed · SIEM-agnostic detection content
Sigma is the open generic signature format for SIEM systems. Each rule below converts to native syntax for Splunk, Elastic, Sentinel, and other SIEMs. Expand any rule to see its raw YAML.
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Detection rules

6 shown of 6
high
Important Windows Eventlog Cleared
Detects the clearing of one of the Windows Core Eventlogs. e.g. caused by "wevtutil cl" command execution
status test author Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems) id 100ef69e-3327-481c-8e5c-6d80d9507556
view Sigma YAML 
title: Important Windows Eventlog Cleared
id: 100ef69e-3327-481c-8e5c-6d80d9507556
related:
    - id: a62b37e0-45d3-48d9-a517-90c1a1b0186b
      type: derived
status: test
description: Detects the clearing of one of the Windows Core Eventlogs. e.g. caused by "wevtutil cl" command execution
references:
    - https://twitter.com/deviouspolack/status/832535435960209408
    - https://www.hybrid-analysis.com/sample/027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745?environmentId=100
author: Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
date: 2022-05-17
modified: 2023-11-15
tags:
    - attack.defense-impairment
    - attack.t1685.005
    - car.2016-04-002
logsource:
    product: windows
    service: system
detection:
    selection:
        EventID: 104
        Provider_Name: 'Microsoft-Windows-Eventlog'
        Channel:
            - 'Microsoft-Windows-PowerShell/Operational'
            - 'Microsoft-Windows-Sysmon/Operational'
            - 'PowerShellCore/Operational'
            - 'Security'
            - 'System'
            - 'Windows PowerShell'
    condition: selection
falsepositives:
    - Rollout of log collection agents (the setup routine often includes a reset of the local Eventlog)
    - System provisioning (system reset before the golden image creation)
level: high
high
Security Eventlog Cleared
One of the Windows Eventlogs has been cleared. e.g. caused by "wevtutil cl" command execution
status test author Florian Roth (Nextron Systems) id d99b79d2-0a6f-4f46-ad8b-260b6e17f982
view Sigma YAML 
title: Security Eventlog Cleared
id: d99b79d2-0a6f-4f46-ad8b-260b6e17f982
related:
    - id: f2f01843-e7b8-4f95-a35a-d23584476423
      type: obsolete
    - id: a122ac13-daf8-4175-83a2-72c387be339d
      type: obsolete
status: test
description: One of the Windows Eventlogs has been cleared. e.g. caused by "wevtutil cl" command execution
references:
    - https://twitter.com/deviouspolack/status/832535435960209408
    - https://www.hybrid-analysis.com/sample/027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745?environmentId=100
    - https://github.com/Azure/Azure-Sentinel/blob/f99542b94afe0ad2f19a82cc08262e7ac8e1428e/Detections/SecurityEvent/SecurityEventLogCleared.yaml
author: Florian Roth (Nextron Systems)
date: 2017-01-10
modified: 2022-02-24
tags:
    - attack.defense-impairment
    - attack.t1685.005
    - car.2016-04-002
logsource:
    product: windows
    service: security
detection:
    selection_517:
        EventID: 517
        Provider_Name: Security
    selection_1102:
        EventID: 1102
        Provider_Name: Microsoft-Windows-Eventlog
    condition: 1 of selection_*
falsepositives:
    - Rollout of log collection agents (the setup routine often includes a reset of the local Eventlog)
    - System provisioning (system reset before the golden image creation)
level: high
high
Suspicious Eventlog Clearing or Configuration Change Activity
Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic". This technique were seen used by threat actors and ransomware strains in order to evade defenses.
status stable author Ecco, Daniil Yugoslavskiy, oscd.community, D3F7A5105, Swachchhanda Shrawan Poudel (Nextron Systems) id cc36992a-4671-4f21-a91d-6c2b72a2edf5
view Sigma YAML 
title: Suspicious Eventlog Clearing or Configuration Change Activity
id: cc36992a-4671-4f21-a91d-6c2b72a2edf5
status: stable
description: |
    Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".
    This technique were seen used by threat actors and ransomware strains in order to evade defenses.
references:
    - 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://learn.microsoft.com/en-us/windows-server/administration/windows-commands/wevtutil
    - https://gist.github.com/fovtran/ac0624983c7722e80a8f5a4babb170ee
    - https://jdhnet.wordpress.com/2017/12/19/changing-the-location-of-the-windows-event-logs/
    - https://www.linkedin.com/posts/huntress-labs_when-a-sketchy-incident-hits-your-network-activity-7304940371078238208-Th_l/?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAJTlRcB28IaUtg03HUU-IdliwzoAL1flGc
    - 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: Ecco, Daniil Yugoslavskiy, oscd.community, D3F7A5105, Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2019-09-26
modified: 2025-03-12
tags:
    - attack.defense-impairment
    - attack.t1685.005
    - attack.t1685.001
    - car.2016-04-002
logsource:
    category: process_creation
    product: windows
detection:
    selection_wevtutil_img:
        - Image|endswith: '\wevtutil.exe'
        - OriginalFileName: 'wevtutil.exe'
    selection_wevtutil_cmd:
        CommandLine|contains:
            - 'clear-log '          # clears specified log
            - ' cl '                # short version of 'clear-log'
            - 'set-log '            # modifies config of specified log. could be uset to set it to a tiny size
            - ' sl '                # short version of 'set-log'
            - 'lfn:'                # change log file location and name
    selection_other_ps_img:
        Image|endswith:
            - '\powershell.exe'
            - '\powershell_ise.exe'
            - '\pwsh.exe'
    selection_other_ps_cmd:
        - CommandLine|contains:
              - 'Clear-EventLog '
              - 'Remove-EventLog '
              - 'Limit-EventLog '
              - 'Clear-WinEvent '
        - CommandLine|contains|all:
              - 'Eventing.Reader.EventLogSession' # [System.Diagnostics.Eventing.Reader.EventLogSession]::GlobalSession.ClearLog($_.LogName)
              - 'ClearLog'
        - CommandLine|contains|all:
              - 'Diagnostics.EventLog'
              - 'Clear'
    selection_other_wmi:
        Image|endswith:
            - '\powershell.exe'
            - '\powershell_ise.exe'
            - '\pwsh.exe'
            - '\wmic.exe'
        CommandLine|contains: 'ClearEventLog'
    filter_main_msiexec:
        # Example seen during office update/installation:
        #   ParentImage: C:\Windows\SysWOW64\msiexec.exe
        #   CommandLine: "C:\WINDOWS\system32\wevtutil.exe" sl Microsoft-RMS-MSIPC/Debug /q:true /e:true /l:4 /rt:false
        ParentImage:
            - 'C:\Windows\SysWOW64\msiexec.exe'
            - 'C:\Windows\System32\msiexec.exe'
        CommandLine|contains: ' sl '
    condition: (all of selection_wevtutil_*) or (all of selection_other_ps_*) or (selection_other_wmi) and not 1 of filter_main_*
falsepositives:
    - Admin activity
    - Scripts and administrative tools used in the monitored environment
    - Maintenance activity
level: high
high
Suspicious Windows Trace ETW Session Tamper Via Logman.EXE
Detects the execution of "logman" utility in order to disable or delete Windows trace sessions
status test author Florian Roth (Nextron Systems) id cd1f961e-0b96-436b-b7c6-38da4583ec00
view Sigma YAML 
title: Suspicious Windows Trace ETW Session Tamper Via Logman.EXE
id: cd1f961e-0b96-436b-b7c6-38da4583ec00
status: test
description: Detects the execution of "logman" utility in order to disable or delete Windows trace sessions
references:
    - https://twitter.com/0gtweet/status/1359039665232306183?s=21
    - https://ss64.com/nt/logman.html
author: Florian Roth (Nextron Systems)
date: 2021-02-11
modified: 2023-02-21
tags:
    - attack.defense-impairment
    - attack.t1685
    - attack.t1685.005
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\logman.exe'
        - OriginalFileName: 'Logman.exe'
    selection_action:
        CommandLine|contains:
            - 'stop '
            - 'delete '
    selection_service:
        CommandLine|contains:
            - 'Circular Kernel Context Logger'
            - 'EventLog-' # Cover multiple traces starting with EventLog-*
            - 'SYSMON TRACE'
            - 'SysmonDnsEtwSession'
    condition: all of selection*
falsepositives:
    - Legitimate deactivation by administrative staff
    - Installer tools that disable services, e.g. before log collection agent installation
level: high
medium
Eventlog Cleared
One of the Windows Eventlogs has been cleared. e.g. caused by "wevtutil cl" command execution
status test author Florian Roth (Nextron Systems) id a62b37e0-45d3-48d9-a517-90c1a1b0186b
view Sigma YAML 
title: Eventlog Cleared
id: a62b37e0-45d3-48d9-a517-90c1a1b0186b
related:
    - id: f2f01843-e7b8-4f95-a35a-d23584476423
      type: obsolete
    - id: d99b79d2-0a6f-4f46-ad8b-260b6e17f982
      type: derived
    - id: 100ef69e-3327-481c-8e5c-6d80d9507556
      type: derived
status: test
description: One of the Windows Eventlogs has been cleared. e.g. caused by "wevtutil cl" command execution
references:
    - https://twitter.com/deviouspolack/status/832535435960209408
    - https://www.hybrid-analysis.com/sample/027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745?environmentId=100
author: Florian Roth (Nextron Systems)
date: 2017-01-10
modified: 2023-11-15
tags:
    - attack.defense-impairment
    - attack.t1685.005
    - car.2016-04-002
logsource:
    product: windows
    service: system
detection:
    selection:
        EventID: 104
        Provider_Name: 'Microsoft-Windows-Eventlog'
    filter_main_covered:
        # The channels below are already covered by the rule 100ef69e-3327-481c-8e5c-6d80d9507556
        Channel:
            - 'Microsoft-Windows-PowerShell/Operational'
            - 'Microsoft-Windows-Sysmon/Operational'
            - 'PowerShellCore/Operational'
            - 'Security'
            - 'System'
            - 'Windows PowerShell'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Rollout of log collection agents (the setup routine often includes a reset of the local Eventlog)
    - System provisioning (system reset before the golden image creation)
level: medium
medium
Suspicious Eventlog Clear
Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs
status test author Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems) id 0f017df3-8f5a-414f-ad6b-24aff1128278
view Sigma YAML 
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-impairment
    - attack.t1685.005
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
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