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P4T12ICK
55 lines
1.7 KiB
YAML
55 lines
1.7 KiB
YAML
name: Disable Logs Using WevtUtil
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id: 236e7c8e-c9d9-11eb-a824-acde48001122
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version: 1
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date: '2021-06-10'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: This search is to detect execution of wevtutil.exe to disable logs. This
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technique was seen in several ransomware to disable the event logs to evade alerts
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and detections.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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CommandLine: '*sl*'
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Image|endswith: wevtutil.exe
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selection2:
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CommandLine: '*/e:false*'
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condition: selection1 and selection2
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: network operator may disable audit event logs for debugging
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purposes.
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references:
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- https://www.bleepingcomputer.com/news/security/new-ransom-x-ransomware-used-in-texas-txdot-cyberattack/
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tags:
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analytic_story:
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- Ransomware
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asset_type: Endpoint
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confidence: 80
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impact: 30
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message: WevtUtil.exe used to disable Event Logging on $dest
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mitre_attack_id:
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- T1070
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- T1070.001
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 24
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data1/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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