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Detection rules › Sigma

EventLog EVTX File Deleted

Status
test
Severity
medium
Log source
category file_delete, product windows
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the deletion of the event log files which may indicate an attempt to destroy forensic evidence

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 23: FileDelete (File Delete archived)
SysmonEvent ID 26: FileDeleteDetected (File Delete logged)

Rule body

title: EventLog EVTX File Deleted
id: 63c779ba-f638-40a0-a593-ddd45e8b1ddc
status: test
description: Detects the deletion of the event log files which may indicate an attempt to destroy forensic evidence
references:
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-02-15
tags:
    - attack.stealth
    - attack.t1070
logsource:
    category: file_delete
    product: windows
detection:
    selection:
        TargetFilename|startswith: 'C:\Windows\System32\winevt\Logs\'
        TargetFilename|endswith: '.evtx'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetFilename|startswith: 'C:\Windows\System32\winevt\Logs\'
    TargetFilename|endswith: '.evtx'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
TargetFilenameends_with
  • .evtx corpus 2 (sigma 2)
field:"TargetFilename" kind:ends_with value:".evtx"
TargetFilenamestarts_with
  • C:\Windows\System32\winevt\Logs\
field:"TargetFilename" kind:starts_with value:"C:\Windows\System32\winevt\Logs\"